JP2007202428A - Environmentally responsive pellets or crumble feed for pig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide environmentally responsive pellets or crumble feed for pigs not inhibiting growth of the digestive organs of pigs, made in consideration of digesting pace so as not to cause gastric ulcer, and reducing excretory substance. <P>SOLUTION: The environmentally responsive pellets or crumble feed for pigs contains grain fine powder having a particle diameter of <0.84 mm at a weight ratio of 28-42 wt.%, and is supplied to pigs to quicken the digesting pace and drastically reduce excretory substance. The feed contains 43-57 wt.% of coarse grains having a particle diameter of 0.84-4.00 mm so as to moderately stimulate the digestive organs and to promote the growth of the digestive organs to prevent occurrence of gastric ulcer. The feed comprises granulated or crumbled one such as pellets or expanders so as to promote growth and improve feed efficiency. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an environmentally friendly feed for raising pigs.

  In the breeding of pigs, feeds containing various raw materials are fed so as to satisfy the necessary nutritional components. The feed includes mash feed, pellet feed, expander feed and the like depending on the shape and processing. Mash feed is prepared by mixing raw materials with coarse particles, and pellet feed and expander feed are formed by adding water vapor, water, pressure, etc. with the raw materials in fine powder form. A coarsely ground pellet feed and expander feed is crumble feed.

  Since mash feed uses coarse raw materials, it is highly irritating to digestive organs such as the esophagus, stomach, small intestine, and large intestine, and has the effect of promoting the development of the digestive organs by its contraction. However, on the other hand, because the surface area is small, the digestibility is poor, the feed efficiency and weight gain are poor, and the amount of excreta increases, not only does the processing cost increase, but the amount of excreted nitrogen increases and the odor increases. As a result, the working environment of managers deteriorates, the health of pigs is damaged, and complaints are received from the local residents. In addition, separation of trace components such as vitamins and minerals occurs, bias in feed and feed efficiency and weight gain deteriorate, resulting in individual differences in development.

  Pellet and expander feeds form a fine powdery raw material, so there is less irritation to digestive organs such as the esophagus, stomach, small intestine, large intestine, etc. Improvement and the amount of excreta decrease. In addition, separation of trace amounts of vitamins, minerals, etc. is difficult and uniform in the feed, improving feed efficiency and weight gain and reducing individual differences in body weight. However, due to the high digestibility, the growth of digestive organs is delayed, and there may be cases where a satisfactory body gain cannot be obtained in the later stage of breeding. In addition, since the specific gravity is small, the food content reaches the upper stomach, and the cardia located in the upper stomach easily causes ulcers due to gastric acid.

  An object of the present invention is to provide an environmental pig pellet or crumble feed that does not inhibit the development of digestive organs in pig breeding, improves feed efficiency and weight gain, and achieves weight reduction of excreta.

In order to solve the above-described problems, the invention described in each of the claims is configured.
The first invention of the present invention contains 28 to 42%, preferably 30 to 40% by weight of fine grains of cereal grains having a particle size of less than 0.84 mm and a particle size of 0.84 to 4.4. A pig feed containing coarse grains of 00 mm in a weight ratio of 43% to 57%, preferably 45% to 55%. Here, the weight ratio is the weight ratio relative to the whole feed. Moreover, the particle size referred to in the present invention is less than 0.84 mm, which means a particle size that has passed a nominal size 0.84 mm of a standard sieve defined in Japanese Industrial Standard. A particle size of 0.84 mm to 4.00 mm means that the standard sieve defined in Japanese Industrial Standards passes a sieve with a nominal size of 4.00 mm but does not pass a 0.84 mm sieve. To do. The reason why the cereal fine powder having a particle size of less than 0.84 mm is contained in the weight ratio of 28% to 42% is that if the content of the fine powder is less than this, the digestion rate is slowed down, and the feed efficiency and weight gain are increased. This is because it gets worse. In addition, if the content of fine powder is higher than this, the digestion rate becomes too fast, causing a delay in the development of digestive organs and causing gastric ulcer. It is preferable that 40% of fine powder is contained for the reduction of excrement. Furthermore, it was decided to contain 43% to 57% of coarse grains of grain having a particle size of 0.84 to 4.00 mm. If the content of coarse grains is less than this, the digestion rate becomes too fast, This is because there is a delay in the development of the digestive organs, and when the content of coarse particles is higher than this, the digestion rate is slowed, and feed efficiency and body weight increase. It is preferable to contain 45% of coarse particles for the reduction of excrement.

  Of the present invention, in the second invention, in the first invention described above, the fine grains and coarse grains are selected from the group consisting of corn, milo, rice, barley, wheat, rye, oat, tapioca, and sweet potato. It is a feed for pigs that is a fine and coarse grain of at least one grain. By blending these cereals, the necessary nutritional components are sufficiently satisfied, and it is possible to reliably blend cereal fines and coarse grains.

  A third invention of the present invention is a pig feed obtained by granulating or crumble-processing the above-described pig feed according to the first invention by processing such as pellets and expanders. By subjecting the feed for pigs according to the first invention of the present invention to granulation processing such as pellets and expanders, the growth of digestive organs is not hindered, the digestibility and palatability are improved, and the amount of excrement is reduced. .

  Of the present invention, the fourth invention is the above-described first feed, except that the coarse grain of the grain of 0.84 mm to 4.00 mm is granulated or crumbled with a pellet, an expander or the like. By mixing the ingredients with other raw materials, the cost for the granulation process becomes a proportion, so that it becomes the inexpensive environment-friendly pig pellet or crumble feed according to the fourth invention.

  Provided is an environmentally friendly pig pellet or crumble feed that does not inhibit the growth of the digestive organs of pigs and also considers the digestion rate so that stomach ulcers do not occur.

  Hereinafter, the best mode for carrying out the present invention will be described in detail. The pig feed according to the present invention contains 28% to 42%, preferably 30% to 40%, by weight of fine grains of grain having a particle size of less than 0.84 mm and a particle size of 0.84 mm to 4. It is a feed for pigs containing 43% to 57%, preferably 45% to 55%, by weight of coarse grains of 00 mm. Here, the pig according to the present invention indicates, for example, a pig raised as a domestic animal, and mainly indicates a pig raised for the purpose of producing edible pork. It also shows pigs raised for the purpose of parents of pigs raised for the purpose of producing edible pork.

The pig pellet or crumble feed of the present invention can be produced by the following two methods.
The first method is to contain fine grains of grains having a particle size of less than 0.84 mm in a weight ratio of 28% to 42% and coarse grains of grains having a particle diameter of 0.84 mm to 4.00 mm in a weight ratio. This is a method in which all the feed for pigs containing 43% to 57% is granulated or crumbled with pellets, expanders or the like.
The second method involves granulating a portion other than coarse grains of grain having a particle size of 0.84 mm to 4.00 mm, including fine grains of grains having a particle size of less than 0.84 mm, with a pellet, an expander, or the like. This is a method of mixing crumb-processed grains and coarse grains of grains having a particle diameter of 0.84 mm to 4.00 mm. Hereinafter, each of the two methods will be described in detail.

  In the first method, a grain to be used in advance is pulverized by a roll pulverizer, a nominal particle size of 0.84 mm and a 4.00 mm sieve, and the grain size is less than 0.84 mm. The coarse grains of 4.00 mm are separated. The shape of the coarse grain of the grain may be any shape such as a columnar shape, a spherical shape, or a block shape. Other raw materials may have a general shape. Fine powder with a grain size of less than 0.84 mm, which has been previously separated by a roll grinder or sieve, is 28% to 42% by weight and coarse particles with a particle size of 0.84 to 4.00 mm are weight ratios. 43% to 57% and other raw materials are mixed with vitamins, minerals and amino acids in advance so as to become necessary nutrients. The mixed raw material is pre-treated with pressurized steam and water, and then pressure-molded into a cylindrical shape by a pellet machine. Pellet granulation can also be performed after pretreatment with an expander or the like. After pellet granulation, crumble feed can be produced by grinding with a roll grinder so that it is easy to eat. When maximizing the reduction of excrement, the fine powder having a particle size of less than 0.84 mm is 40% by weight, and the coarse particle having a particle size of 0.84 to 4.00 mm is 45% by weight. It is preferable.

In the second method, as in the first method, the grain to be used in advance is pulverized by a roll pulverizer, and fine particles and grains of a grain having a particle size of less than 0.84 mm are obtained by a sieve having a nominal size of 0.84 mm and 4.00 mm. Grain grains having a diameter of 0.84 mm to 4.00 mm are separated. The shape of the coarse grain of the grain may be any shape such as a columnar shape, a spherical shape, or a block shape. Other raw materials may have a general shape.
Other raw materials are mixed so that the fine powder of grains having a particle size of less than 0.84 mm is contained in the final feed in a weight ratio of 28% to 42%, and the raw material portions other than the coarse grains of the grains are mixed with pressurized steam and water. After the pretreatment by, press molding into a cylindrical shape by a pellet machine. Pellet granulation can also be performed after pretreatment with an expander or the like. After pellet granulation, crumble feed can be produced by grinding with a roll grinder so that it is easy to eat. Pellet or crumble feed and coarse particles having a particle size of 0.84 to 4.00 mm are mixed in a weight ratio of 45% to 55% to obtain the final pellet or crumble feed. When maximizing the reduction of excrement, the fine powder having a particle size of less than 0.84 mm is 40% by weight, and the coarse particle having a particle size of 0.84 to 4.00 mm is 45% by weight. It is preferable.

  Feeding the pig pellets or crumble feed of the present invention improves the digestion and absorption, thereby improving the feed efficiency and weight gain, and the coarse grains of the grains contained in the feed, especially at the piglet stage. The growth of the organ is promoted and the increase in the fattening late stage is improved.

  The crumble feed for pigs of the present invention can be fed at any time in the early or late period of pig fattening. When fed in the first fattening period (30 kg to 70 kg), the growth of the digestive organs is promoted, the piglet becomes healthy, feed efficiency and weight gain are improved, and excrement is reduced. When fed in the late fattening period (70 kg to 110 kg), there is no bias in nutritional value, so trace components such as vitamins, minerals, and amino acids can be ingested uniformly, individual differences are reduced, and shipping selection labor is reduced. In addition, fattening late-stage feed generally tends to be clogged by bridges in the feeder, but the pellet or crumble feed of the present invention is mixed with coarse grains and has good fluidity, and no bridging occurs. . In addition, excrement is reduced. It also prevents gastric ulcers.

  The pig pellet or crumble feed of the present invention contains coarse grains having a particle size of 0.84 mm to 4.00 mm mixed in a weight ratio of 43% to 57%. Even when switching to feed, the digestive organs are sufficiently developed so that they can move smoothly without problems.

  Furthermore, the pork pellet or crumble feed of the present invention is fine except for coarse grains, and contains minute components such as vitamins, minerals, amino acids, etc., and is processed into pellets or crumbles. It is always adapted to the precise design of environmentally friendly low protein feeds that can always be fed uniformly.

  Examples that further embody the present invention will be described, but the present invention is not limited thereto.

Example 1
A pig crumble feed according to the first method of the present invention was produced as a test plot, a conventional mash feed was used for the control plot 1, a conventional pig crumble feed was used for the control plot 2, and a male weight of about 40 kg was used. Ten piglets and 10 female piglets were fed and a breeding test was conducted up to a weight of about 80 kg. All the raw materials were in the same proportion, but the grain size of corn and milo was adjusted. The mixing ratio of each raw material is shown in Table 1.

  The crumble feed for pigs and the conventional crumble feed according to the first method of the present invention are pre-treated with pressurized steam and water after the raw materials mixed in advance as shown in Table 1 are subjected to expander processing, and are formed into a cylindrical shape by a pellet machine. Was pressure molded. Furthermore, using a crumble machine, the pork was crushed to a size that was easy to eat, and was used as a crumble feed for pigs. The conventional mash feed was mixed with raw materials as shown in Table 1.

  Twenty piglets whose weights were measured were placed in a farm with the same environment, and a breeding test was conducted. Feed and drinking water were ad libitum, and the weight of the pig was measured after 30 days and 58 days, and the increase in weight per day was calculated. Further, after 30 days and 58 days, the feed intake was measured and the feed demand rate was calculated. These measurement results and calculation results are shown in Table 2 below.

  As shown in Table 2, the daily gain after 30 days in the test group was 0.966 kg, whereas the control group 1 was significantly inferior to 0.850 kg. The control group 2 was slightly inferior at 0.953 kg, but it was not a big difference. In addition, the increase in weight per day from 30 days to 58 days after the test group was 0.607 kg, whereas the control group 1 was 0.496 kg and the control group 2 was 0.504 kg, which was significantly inferior. In other words, it was confirmed that the crumble feed for pigs according to the first method of the present invention was improved in weight gain over the entire period when the body weight was about 40 kg to about 80 kg, as compared with the conventional mash feed. Conventional crumble diets weighed about 40 kg to about 80 kg, and there was not much difference in weight gain in the first half because there was a lot of fine powder. I was able to confirm.

  In order to measure the excrement weight in each section, pigs having a body weight of about 70 kg were bred for 2 days, 2 males and 2 females, and the excrement weight was measured. The feed was restricted to 3 kg per day. The measurement results and calculation results are shown in Table 3 below.

  As shown in Table 3, the average amount of excretion per head for 7 days in the test group was 0.65 kg, whereas 1.70 kg in the control group 1 and 0.82 in the control group 2 were significantly higher. became. That is, it was confirmed that the amount of excreta was reduced in about 70 kg of pigs in the first period of fattening by feeding the pig crumble feed according to the first method of the present invention.

Example 2
A crumble feed for pigs according to the first method of the present invention was produced and used as a test group, the control group 1 used a conventional mash feed, the control group 2 used a conventional pig crumble feed, 10 males weighing about 80 kg, It was fed to 10 female piglets and a breeding test was conducted up to a weight of about 105 kg. All the raw materials were in the same proportion, but the grain size of corn and milo was adjusted. Table 4 shows the blending ratio of each raw material.

  The crumble feed for pigs and the conventional crumble feed according to the first method of the present invention are prepared by subjecting the raw materials mixed in advance as shown in Table 4 to pretreatment with pressurized steam and water, followed by an expander process, and a cylindrical shape by a pellet machine. Was pressure molded. Furthermore, using a crumble machine, the pork was crushed to a size that was easy to eat, and was used as a crumble feed for pigs. The conventional mash feed was mixed with raw materials as shown in Table 4.

  Twenty piglets whose weights were measured were placed in a farm with the same environment, and a breeding test was conducted. Feed and drinking water were freely consumed, and the body weight of the pig was measured after 30 days to calculate the increase in weight per day. In addition, after 30 days, the feed intake was measured and the feed request rate was calculated. These measurement results and calculation results are shown in Table 5 below.

  As shown in Table 5, the daily gain after 30 days in the test group was 0.816 kg, whereas the control group 1 was significantly inferior to 0.783 kg. Control group 2 was slightly inferior at 0.803 kg, but there was no significant difference. That is, it was confirmed that the weight gain per day was improved in the crumble feed for pigs according to the first method of the present invention when the body weight was about 80 kg to about 105 kg as compared with the conventional mash feed.

  About 105 kg of each pig was slaughtered, and its meat quality, yield, and gastric ulcer status were confirmed. The results are shown in Table 6 below.

  As shown in Table 6, the average carcass weight was 74.8 kg in the test group, whereas it was 68.9 kg in the control group 1 and 70.2 kg in the control group 2. That is, it can be confirmed that during the breeding period of the same number of days, the pig crumble feed according to the first method of the present invention has a larger carcass weight and shorter breeding days than the conventional mash feed and the conventional crumble feed. It was.

  In addition, the average carcass yield in the test group was 68.0%, whereas it was 62.9% in the control group 1 and 66.5% in the control group 2, which is significantly low. That is, in the breeding section with the same number of days, it was confirmed that the crumbled feed for pigs according to the first method of the present invention improved digestion and absorption, improved the feed demand rate, and improved the yield with the development of digestive organs. .

  In the carcass rating, the test group had an upper rate of 45%, while the control group 1 was 25% and the control group 2 was 35%. In other words, during the breeding period of the same number of days, confirmation that the crumble feed for pigs according to the first method of the present invention is finished into a carcass that conforms to the standards of proper weight, meat color, fat color, texture, back fat thickness, loin core, etc. I was able to.

  The number of gastric ulcers that were mild or more in the test group was 6 in the test group, while that in the control group 1 was 5 and the control group 2 was 15 in the test group. That is, in the breeding section with the same number of days, the crumble feed for pigs according to the first method of the present invention has the same gastric ulcer effect as the conventional mash feed, and the conventional crumble feed has only an adverse effect such as digestibility. It was confirmed that there was a risk of death in the worst case.

  In order to measure the weight of each excrement, pigs having a body weight of about 100 kg were bred for two days for two males and two females, and the excrement weights were measured. The feed was restricted to 2.5 kg per day. The measurement results and calculation results are shown in Table 7 below.

  As shown in Table 7, the average amount of excretion per head for 5 days in the test group was 0.61 kg, whereas 2.06 kg in the control group 1 and 0.85 in the control group 2 were significantly higher. became. That is, it was confirmed that the amount of excreta was reduced in about 100 kg pigs in the late fattening period by feeding the crumble feed for pigs according to the first method of the present invention.

Example 3
Next, the pig crumble feed according to the second method of the present invention will be described.

  A pig crumble feed according to the second method of the present invention was produced as a test plot, a conventional mash feed was used as the control plot 1, a conventional pig crumble feed was used as the control plot 2, and a male pig weighing approximately 30 kg. Five piglets and five female piglets were fed and a breeding test was conducted up to a body weight of about 70 kg. All the raw materials were in the same proportion, but the grain size of corn and milo was adjusted. Table 8 shows the blending ratio of each raw material.

  The crumble feed for pigs according to the second method of the present invention is prepared by mixing in advance raw materials other than corn coarse particles 0.84 mm to 4.00 mm and mylo coarse particles 0.84 mm to 4.00 mm in Table 8, The mixed raw material is pretreated with pressurized steam and water, then subjected to an expander process, and pressure-molded into a cylindrical shape by a pellet machine. In addition, using a crumble machine, chop it into pieces that are easy for pigs to eat. 50% of the ground raw material, 35% of corn coarse particles 0.84 mm to 4.00 mm, and 15% of miro coarse particles 0.84 mm to 4.00 mm are mixed, and the second method of the present invention. Produced a crumble feed for pigs.

  The conventional crumble feed was prepared by pre-processing the raw materials mixed in advance as shown in Table 8 with pressurized steam and water, followed by expander processing, and press-molding into a cylindrical shape with a pellet machine. Furthermore, using a crumble machine, the pork was crushed to a size that was easy to eat, and was used as a crumble feed for pigs. The conventional mash feed was mixed with raw materials as shown in Table 8.

  Ten piglets whose weights were measured were placed in a breeding ground with the same environment, and a breeding test was conducted. Feed and drinking water were freely consumed, and the weight of the pig was measured after 60 days to calculate the increase in weight per day. Further, after 60 days, the feed intake was measured and the feed demand rate was calculated. These measurement results and calculation results are shown in Table 9 below.

  As shown in Table 9, the daily gain after 60 days in the test group was 0.805 kg, while the control group 1 was 0.743 kg and the control group 2 was 0.773 kg. That is, it was confirmed that the pig crumble feed of the second method of the present invention was improved in weight gain compared to the conventional mash and the conventional crumble feed.

  In order to measure the weight of excrement in each section, pigs having a body weight of about 60 kg were bred for two days with two males and two females, and the weight of the excrement was measured. The feed was restricted to 3 kg per day. The measurement results and calculation results are shown in Table 10 below.

  As shown in Table 10, the average amount of excretion per head for 5 days in the test group was 0.72 kg, whereas 1.60 kg in the control group 1 and 0.80 in the control group 2 were significantly higher. became. In other words, it was confirmed that the amount of excreta was reduced in about 60 kg of pigs in the first period of fattening by feeding the pig crumble feed according to the second method of the present invention.

Example 4
The pig crumble feed according to the second method of the present invention was produced and used as a test group, the control group 1 was a conventional mash feed, the control group 2 was a conventional pig crumble feed, and 5 males weighing about 70 kg. , 5 female piglets were fed and raised to a weight of about 110 kg. All the raw materials were in the same proportion, but the grain size of corn and milo was adjusted. Table 11 shows the blending ratio of each raw material.

  The crumble feed for pigs according to the second method of the present invention is prepared by previously mixing raw materials other than corn coarse grains 0.84 mm to 4.00 mm and mylo coarse grains 0.84 mm to 4.00 mm in Table 11, The mixed raw material is pretreated with pressurized steam and water, then subjected to an expander process, and pressure-molded into a cylindrical shape by a pellet machine. In addition, using a crumble machine, chop it into pieces that are easy for pigs to eat. 45% of the ground raw material, 30% of corn coarse particles 0.84 mm to 4.00 mm, and 25% of miro coarse particles 0.84 mm to 4.00 mm are mixed, and the second method of the present invention. Produced a crumble feed for pigs.

  The conventional crumbled feed was pre-treated with pressurized steam and water after the raw materials mixed in advance as shown in Table 11 were subjected to expander processing, and pressure-molded into a cylindrical shape by a pellet machine. Furthermore, using a crumble machine, the pork was crushed to a size that was easy to eat, and was used as a crumble feed for pigs. The conventional mash feed was mixed with raw materials as shown in Table 11.

  Ten piglets whose weights were measured were placed in a breeding ground with the same environment, and a breeding test was conducted. Feed and drinking water were freely consumed, and the weight of the pig was measured after 60 days to calculate the increase in weight per day. Further, after 60 days, the feed intake was measured and the feed demand rate was calculated. These measurement results and calculation results are shown in Table 12 below.

  As shown in Table 12, the daily gain after 60 days in the test group was 0.860 kg, while the control group 1 was significantly inferior to 0.790 kg. The control group 2 was slightly inferior at 0.838 kg, but there was no significant difference. In other words, it was confirmed that the pig crumble feed according to the second method of the present invention was improved in weight gain from about 70 kg to about 110 kg as compared with the conventional mash feed.

  About 110 kg of each pig was slaughtered, and its meat quality, yield, and gastric ulcer status were confirmed. The results are shown in Table 13 below.

  As shown in Table 13, the average carcass weight was 73.4 kg in the test group, whereas it was 69.4 kg in the control group 1 and 72.2 kg in the control group 2. That is, it was confirmed that the pig crumble feed according to the second method of the present invention increases the carcass weight and shortens the breeding days in the breeding section with the same number of days as compared with the conventional mash feed and the conventional crumble feed. It was.

  In the test group, the average carcass yield was 68.3%, whereas the control group 1 was 63.6% and the control group 2 was 67.0%, which is significantly lower. In other words, during the breeding period of the same number of days, the crumble feed for pigs according to the second method of the present invention improves digestion and improves digestion and absorption, improving the demand rate of feed and improving the yield. It could be confirmed.

  In the carcass rating, the test group had an excellent rate of 40%, while the control group 1 was 30% and the control group 2 was 30%. That is, during the breeding period of the same number of days, the crumble feed for pigs according to the second method of the present invention is finished to carcass that conforms to the standards of proper weight, meat color, fat color, texture, back fat thickness, loin core, etc. Was confirmed.

  The number of gastric ulcers in the test group was 3 or more in the test group, while the number of gastric ulcers was 2 in the control group 2 and 8 in the control group 2. In other words, during the breeding period of the same number of days, the crumble feed for pigs according to the second method of the present invention has the same effect of gastric ulcer as the conventional mash feed, and the conventional crumble feed only has an adverse effect such as digestibility. It was confirmed that there was a risk of death in the worst case.

  In order to measure the excrement weight in each section, a pig test having a body weight of about 100 kg was carried out for 5 days for two males and two females, and the excrement weight was measured. The feed was restricted to 3.0 kg per day. The measurement results and calculation results are shown in Table 14 below.

  As shown in Table 14, the average amount of excretion per head for 5 days in the test group was 0.78 kg, whereas it was 2.16 kg in the control group 1 and 0.92 in the control group 2 which was significantly higher. became. That is, it was confirmed that the amount of excreta was reduced in about 100 kg pigs in the late fattening period by feeding the crumble feed for pigs according to the second method of the present invention.

Claims (4)

  Contains from 28% to 42% by weight of cereal fines having a particle size of less than 0.84 mm and from 43% to 57% by weight of coarse cereal grains having a particle size of from 0.84 mm to 4.00 mm Pig feed.   2. The pig feed according to claim 1, wherein the cereal is a grain of at least one cereal selected from the group consisting of corn, milo, rice, barley, wheat, rye, oat, tapioca and sweet potato.   Pig feed obtained by granulating or crumble processing the pig feed according to claim 1 with a granulator such as a pellet or an expander.   A pig feed in which only the fine powder portion of the pig feed according to claim 1 is granulated or crumbled by a granulator such as a pellet or an expander and mixed with the coarse portion.