Composition for preventing gastric ulcer in pigs, and feed

Abstract

As a novel composition for preventing gastric ulcer in pigs, a composition containing water-soluble dietary fibers is provided.

Description

Composition and feed for preventing gastric ulcers in pigs

[0001] The present invention relates to a composition and feed for preventing gastric ulcers in pigs.

[0002] It is known that pigs can develop gastric ulcers (Non-Patent Documents 1 to 3), with symptoms including anemia and bloody stools, often leading to death. A wide variety of causes are thought to cause gastric ulcers in pigs, including infectious diseases such as hog cholera (legal), foot-and-mouth disease (legal), rinderpest (legal), malignant catarrhal fever (notifiable), swine erysipelas (notifiable), Helicobacter spp., trichostrongylus ruber, and ascariasis suum. Other causes include stress, feed particle size, gastric acid, acid administration, mycotoxins, vitamin B6 deficiency, vitamin A excess, and copper excess.

[0003] Generally, the percentage of pigs that suffer from stomach ulcers when the corn grain size is 400 μm is about 70% or more, and there is data that the percentage of pigs that die from stomach ulcers is about 15%. For pig farmers, the economic loss caused by the death of a pig amounts to about 40,000 yen per pig.

[0004] Highly fluid feed has a shorter retention time in the stomach, which leads to the reflex secretion of strong gastric acid, which disrupts the proper pH distribution in each part of the stomach, making the gastroesophageal region, which normally has a pH of 4.0-5.0, highly acidic (pH 2.0-1.9), and attacking the mucous membrane in that region (Non-Patent Document 5, Japan SPF Swine Research Association_21_24-27 (2002)).

[0005] Thus, feeding highly fluid feed makes pigs more susceptible to erosions and ulcers. Furthermore, it is believed that feed containing fine grains (refined feed ingredients) can have adverse effects on the gastroesophageal tract if the solid particle size is very small, the feed is excessively ground, or the proportion of coarse particles is low (Non-Patent Document 1, Journal of the Japan Society of Veterinary Medicine 31-327 (1978)). Furthermore, it is known that the grinding strength of the finely ground raw feed and the compression form of the finely ground raw feed affect the gastric environment (Non-Patent Document 2). Therefore, it is believed that at least feed grinding and compression processes such as extruder processing are responsible for the development of gastric ulcers.

[0006] As such, there is currently concern that the incidence of gastric ulcers in pigs will increase with the spread of feed that is not only highly fluid but also finely granular.

[0007] The administration of compounds such as pepstatin is known as a means of preventing gastric ulcers in pigs (Non-Patent Document 3, Journal of the Japan Society of Veterinary Medicine, Vol. 14, No. 78 (1977)). Attempts have also been made to suppress the development of gastric ulcers in pigs by feeding highly fluid feeds with water-insoluble dietary fiber, which has a long gastric retention time and is thought to suppress the effects of gastric acid. Similar measures have also been attempted, including the use of bedding (a collective term for materials used in bedding, such as rice straw, sawdust, and rice husks) to suppress the development of gastric ulcers in pigs (Non-Patent Document 1, Journal of the Japan Society of Veterinary Medicine, Vol. 31, No. 327 (1978); Non-Patent Document 4, Journal of the Japan Society of Veterinary Medicine, Vol. 14, No. 141 (1977)).

[0008] Journal of the Japan Veterinary Society 31_327 (1978) Animal Feed Science and Technology 194 (2014) 113-120 Journal of the Japan Swine Research Institute 14_78 (1977) Journal of the Japan Swine Research Institute 14_141 (1977) Japan SPF Swine Research Association 21_24-27 (2002) About Ecofeed, Ministry of Agriculture, Forestry and Fisheries <URL: https: / / www.maff.go.jp / j / chikusan / sinko / lin / l_siryo / ecofeed.html> "Various test results publication materials (fiber gum feed)", https: / / premium.ipros.jp / shima / catalog / detail / 470148 /

[0009] However, the present inventors have found that conventional agents for preventing gastric ulcers in pigs are not necessarily effective in preventing gastric ulcers, and that a new agent for preventing gastric ulcers in pigs is needed. Therefore, an object of the present invention is to provide a new composition for preventing gastric ulcers in pigs.

[0010] As a result of extensive research into solving the above problems, the inventors discovered that the above problems could be solved by using a specific material with a previously unknown effect, and as a result of further research, they were able to complete the present invention.

[0011] That is, the present invention relates to at least the following inventions: [1] A composition for preventing gastric ulcers in pigs, comprising water-soluble dietary fiber. [2] The composition for preventing gastric ulcers in pigs according to the above [1], wherein the water-soluble dietary fiber is gum arabic. [3] A pig feed comprising a feed together with the composition for preventing gastric ulcers in pigs according to the above [1] or [2]. [4] The pig feed according to the above [3], wherein the feed further comprises food residues or food pomace and water. [5] The pig feed according to the above [3] or [4], wherein the content of the gastric ulcer prevention composition is 0.001 to 0.1 by weight per 1 by weight of the feed. [6] The pig feed according to the above [3], which is in a solid form. [7] A method for raising pigs, comprising the step of feeding pigs the composition for preventing gastric ulcers in pigs according to the above [1] or [2] or the pig feed according to any of the above [3] to [6]. [8] The method according to [7] above, wherein the pig feed is a feed obtained by mixing a composition for preventing gastric ulcers in pigs with feed. [9] The method according to [7] or [8] above, which comprises preventing gastric ulcers in pigs.

[10] The method according to any one of [7] to [9] above, wherein the water-soluble dietary fiber contained in the composition for preventing gastric ulcers or the pig feed is gum arabic.

[0012] The present invention provides a composition and feed that can prevent gastric ulcers in pigs. Water-insoluble dietary fiber, such as bedding, is believed to increase the gastric retention of feed and prevent gastric ulcers. Therefore, water-insoluble dietary fiber is used as a material for preventing gastric ulcers in pigs. In contrast, soluble dietary fiber does not increase the gastric retention of feed and has properties different from those of water-insoluble dietary fiber. It has not been known until now that water-soluble dietary fiber is effective in preventing gastric ulcers. Considering these facts, the above-mentioned effects achieved by the present invention are unexpected and particularly remarkable, which even a person skilled in the art could not predict based on the prior art.

[0013] According to the method for raising pigs of the present invention, which includes a step of feeding the pigs the above-mentioned composition for preventing gastric ulcers in pigs or pig feed, gastric ulcers in pigs can be prevented, which also leads to an improvement in the mortality rate and enables pigs to be raised with a higher yield.

[0014] In this specification, the term "addition" or "adding" means to bring two components, substances, or materials to be added into a mixed state. In other words, the expression "adding A to B" does not necessarily mean only adding A to B, but also means adding B to A. In this specification, the terms "admixing," "mixing," and "blending" have similar meanings. Furthermore, in this specification, amounts and proportions (concentrations) expressed by "%" or "ppm" indicate proportions by weight unless otherwise specified.

[0015] As used herein, the term "comprises" a component in a medium means that the component is present in the medium, and does not limit the origin of the component. In other words, the term "comprises" encompasses any case in which the component comes to be present, such as when the component is originally present in the raw materials, when a component not present in the raw materials is added from the outside, or when the component is generated during the manufacturing process of the product.

[0016] As used herein, the terms "prevent" or "prevention" refer to reducing or diminishing the frequency of occurrence of an undesirable condition or disease, without limitation on the degree of reduction or diminishment.

[0017] Composition for preventing gastric ulcers in pigs The present invention is based on the invention [1] above, that is, a composition for preventing gastric ulcers in pigs containing water-soluble dietary fiber.

[0018] Gum arabic is a preferred water-soluble dietary fiber in the composition for preventing gastric ulcers in pigs of the present invention. Gum arabic is a polysaccharide obtained from the sap of Acacia plants, and its main components are galactose, arabinose, rhamnose, and glucuronic acid.

[0019] The gum arabic used in the present invention is not limited, but Fibregum (registered trademark) feed (Shima Trading Co., Ltd.) is preferred as the gum arabic in the present invention.

[0020] FiberGum® feed is a water-soluble dietary fiber-containing composition derived from acacia sap, and is disclosed in Non-Patent Document 7. FiberGum® feed is an indigestible high molecular weight polysaccharide purified solely by physical processes without chemical or enzymatic treatment, and 90% or more of the solid content (AOAC Method 985.29) consists of water-soluble dietary fiber. FiberGum® feed is also a long-acting prebiotic with a large molecular weight that acts throughout the intestine (Non-Patent Document 7).

[0021] Without being bound by theory, the effect of the composition for preventing gastric ulcers in pigs of the present invention will be explained as follows: The composition for preventing gastric ulcers in pigs of the present invention enriches the bacterial flora in the intestines of pigs, and this effect may be responsible for the effect of the composition for preventing gastric ulcers in pigs of the present invention in preventing gastric ulcers in pigs. On the other hand, the composition for preventing gastric ulcers in pigs of the present invention does not have the effect of lowering the inorganic acid concentration in the pig stomach, and therefore does not require the effect of adjusting pH. The effect of preventing gastric ulcers in pigs of the present invention, which can be achieved by the composition for preventing gastric ulcers in pigs of the present invention without adjusting the pH in the stomach, is a remarkable effect that could not be predicted.

[0022] The composition for preventing gastric ulcers in pigs of the present invention may be fed to pigs alone, or may be mixed with other feed (mixed feed or formulated feed) and fed to pigs as pig feed. The amount of the composition for preventing gastric ulcers in pigs of the present invention to be fed is not limited, and the amount may be adjusted depending on the growth stage of the pigs. For example, the composition may be fed in an amount of about 0.1% to about 1.0% by weight of the amount of solid feed such as concentrated feed or formulated feed. An amount of about 0.15% to about 1.0% by weight is preferred, and an amount of about 0.15% to about 0.2% by weight is more preferred.

[0023] The timing for administering the composition for preventing gastric ulcers in pigs of the present invention is not limited, but is preferably administered from 20 to 27 days of age after weaning. The composition for preventing gastric ulcers in pigs of the present invention may be administered from the rearing stage onwards. For example, administration is preferably initiated from about 65 days of age, more preferably from about 70 days of age. It is also preferable to administer administration from about 65 days of age until the time of shipment (for example, about 180 days of age). The number of days for administering the composition for preventing gastric ulcers in pigs of the present invention is not limited, but is exemplified as about 90 days or more (about 3 months or more). As such a number of days, administration is preferably initiated from about 100 days or more, more preferably from about 110 days or more.

[0024] <Method for producing a composition for preventing gastric ulcers in pigs> The method for producing the composition for preventing gastric ulcers in pigs of the present invention is not limited, and examples thereof include a method comprising a step of purifying acacia sap. The form of the composition for preventing gastric ulcers in pigs of the present invention is not limited, and it may be administered as is or may be formulated and administered.

[0025] The composition for preventing gastric ulcers in pigs of the present invention may contain one or more components that are added to final pig feed, including components of simple feed, components of mixed feed, and components of compound feed.

[0026] The degree of effectiveness of the composition for preventing gastric ulcers in pigs of the present invention in preventing the occurrence of gastric ulcers is not limited. Examples of compositions for preventing gastric ulcers in pigs of the present invention include compositions that reduce the number of pigs that die from gastric ulcers by about 18% or more compared to when the composition for preventing gastric ulcers in pigs of the present invention is not administered. As such compositions, compositions that reduce the number of pigs that die from gastric ulcers by about 23% or more compared to when the composition for preventing gastric ulcers in pigs of the present invention is preferred, compositions that reduce the number of pigs that die from gastric ulcers by about 30% or more are more preferred, and compositions that reduce the number of pigs that die from gastric ulcers by about 35% or more are even more preferred.

[0027] Feed for Pigs The present invention also relates to feed for pigs, which comprises the composition for preventing gastric ulcers in pigs of the present invention together with feed.

[0028] In the pig feed of the present invention, the feed to be mixed with the gastric ulcer preventive composition for pigs of the present invention is not limited, and examples thereof include plain feed, mixed feed, and compound feed. The plain feed refers to a single ingredient such as grains (barley, corn, soybean, etc.), bran (bran or rice bran), oil cakes (soybean-derived, etc.), and animal ingredients (skim milk powder or fish meal), and individual ingredients used other than the above ingredients are also called plain feed.

[0029] Mixed feed is feed prepared by mixing vitamins, minerals, feed additives, etc. with simple feed, and there are no limitations on the simple feed or feed additives that are mixed. Formula feed is feed formulated with nutrients and supplementary / fortifying ingredients necessary for pig breeding, and the feed generally given to pigs is compound feed. Examples of label information include crude protein, crude fat, crude fiber, and crude ash. Examples of compound feed include those containing grains such as corn and wheat, legumes, fish meal, and meat meal. Other feed additives may be added to the pig feed of the present invention as long as they do not impair the effects of the present invention. Examples of other feed additives include minerals, vitamins, and amino acids.

[0030] The shape of these pig feeds of the present invention is not limited, and may be semi-solid, liquid, or solid such as pellets or crumbles. Solid pig feeds may be molded containing agricultural ingredients such as wheat, corn, heat-treated barley, rice-derived soybean flour, carbohydrates such as dextrin, food ingredients such as confectionery scraps, rapeseed oil cake, and soybean oil cake, ingredients such as CaCO3, calcium phosphate, and NaCl, and heated lactic acid bacteria.

[0031] Among the pig feeds of the present invention, those containing compound feed are preferred. Furthermore, among the pig feeds of the present invention, those containing fine grains and having low gastric retention are preferred. While the amount of water added to the feed is not limited, an example of such an amount is approximately 3 parts by weight of water to 1 part by weight of compound feed. There is a livestock feed called "ecofeed," whose use is encouraged because it can contribute to reducing food waste (Non-Patent Document 6). Ecofeed is produced by mixing food waste with water and fermenting it with lactic acid bacteria, etc., so ecofeeds containing fine grains have a porridge-like texture with small particle size and very fine solids. Ecofeed contains food waste or food pomace (including dregs from shochu production) in addition to compound feed and water, and such ecofeeds may also be used in the pig feed of the present invention.

[0032] The content of the composition for preventing gastric ulcers in pigs in feed is not limited, and an example is an amount of about 0.001 to about 0.01 (about 0.1% by weight to about 1.0% by weight) per 1 weight of solid feed. An amount of about 0.15% by weight to about 0.3% by weight is preferred, and an amount of about 0.15% by weight to about 0.2% by weight is more preferred.

[0033] The method for feeding the pig feed of the present invention to pigs is not limited, and may be a method for feeding in a form commonly used in the art.

[0034] The method for producing the pig feed of the present invention is not limited, and the pig feed may be produced by mixing the pig gastric ulcer prevention composition of the present invention with regular feed or part of the components of the feed. Examples of such regular feed include plain feed, mixed feed, formulated feed, and ecofeed. The water used in producing ecofeed may be heated. When mixing the pig gastric ulcer prevention composition of the present invention with regular feed or part of the components of the feed, the pig gastric ulcer prevention composition of the present invention may be added to the regular feed or part of the components of the feed, or the pig gastric ulcer prevention composition of the present invention may be added to the regular feed or part of the components of the feed. The method for producing the feed of the present invention, which contains water, food residue, or food pomace, is also not limited. Furthermore, in producing such a feed of the present invention, there is no limit to which two or more of the pig gastric ulcer prevention composition of the present invention, regular feed or part of the components of the feed, water, food residue, and food pomace, are mixed, and the order in which the two or more are mixed is not limited. A pig feed in which the pig gastric ulcer preventive composition of the present invention and a normal feed are present together in one container is included in the pig feed of the present invention.

[0035] The timing for feeding the pig feed of the present invention is not limited, but it is preferable to feed it from 20 to 27 days after weaning. The pig feed of the present invention may be fed from the rearing period onwards. As such a timing, for example, a period starting from about 65 days of age is preferred, and a period starting from about 70 days of age is more preferred. It is also preferable to feed it from about 65 days of age until the time of shipping (for example, about 180 days of age). The number of days for feeding the pig feed of the present invention is not limited, but an example is about 90 days or more (about 3 months or more). As such a number of days, about 100 days or more is preferred, and about 110 days or more is more preferred.

[0036] The extent of the effect of the pig feed of the present invention in preventing the occurrence of gastric ulcers is not limited. Examples of the pig feed of the present invention include a feed that reduces the number of pigs that die from gastric ulcers by about 18% or more compared to when the pig feed of the present invention is not fed. As such a feed, a feed that reduces the number of pigs that die from gastric ulcers by about 23% or more compared to when the pig feed of the present invention is not fed is preferred, a feed that reduces the number of pigs that die from gastric ulcers by about 30% or more is more preferred, and a feed that reduces the number of pigs that die from gastric ulcers by about 35% or more is even more preferred.

[0037] The present invention also provides a method for preventing gastric ulcers in pigs, i.e., a method for raising pigs, by feeding any of the above-mentioned compositions for preventing gastric ulcers in pigs of the present invention or the above-mentioned pig feed of the present invention to pigs. In such a method, the method for feeding the composition for preventing gastric ulcers in pigs or the pig feed of the present invention to pigs is not limited and may be a method commonly used in the technical field.

[0038] In the method for raising pigs of the present invention, the timing for feeding the pig gastric ulcer preventive composition or pig feed of the present invention is not limited, but is preferably fed from 20 to 27 days after weaning. In the method for raising pigs of the present invention, the pig gastric ulcer preventive composition or pig feed of the present invention may be fed from the rearing period onwards. For example, a preferred timing is from about 65 days of age, and more preferably from about 70 days of age. It is also preferred to start feeding from about 65 days of age and continue feeding until the time of shipment (e.g., about 180 days of age). The number of days for feeding the pig gastric ulcer preventive composition or pig feed of the present invention is not limited, but is exemplified as about 90 days or more (about 3 months or more). Such a number of days is preferably about 100 days or more, and more preferably about 110 days or more. In the method for raising pigs of the present invention using the gastric ulcer preventive composition for pigs of the present invention or the pig feed of the present invention, it is also preferable to feed the pigs for about 3 months from the time of fattening, which is after 70 days of age (when the pig weighs about 30 kg and the feed intake is about 2 kg).

[0039] According to the present invention, by carrying out the above-described method, the occurrence of gastric ulcers is prevented and the physical condition of pigs is maintained or improved. Therefore, the present invention also provides a method for maintaining or improving the physical condition of pigs. Furthermore, the water-soluble dietary fiber contained in the gastric ulcer prevention composition or pig feed used in the method of the present invention is not limited, but gum arabic is preferred as such water-soluble dietary fiber.

[0040] The gastric ulcer prevention composition for pigs, pig feed, and pig-raising method of the present invention can be applied to any breed of pig. Examples of such breeds include, but are not limited to, Middle Yorkshire, Landrace, Large Yorkshire, Duroc, Berkshire (black pig), Hampshire, and crossbreeds. Furthermore, the branded pigs to which the gastric ulcer prevention composition for pigs, pig feed, and pig-raising method of the present invention can be applied are also not limited. Examples of such branded pigs include, but are not limited to, Kagoshima Kurobuta pigs, Okinawa Agu pigs, Kurao pork, Buono pork Gifu, TOKYO X, Waton Mochibuta, Rose pork, and Japanese rice-raised Hirata Farm Sangenton pigs.

[0041] The present invention will be further described below with reference to examples, but the present invention is not limited to these examples in any sense.

[0042] Example 1: A composition for preventing gastric ulcers in pigs and pig feed of the present invention were prepared, and the effectiveness of the composition and feed in preventing gastric ulcers in pigs was examined. Materials and Methods: Test Period: July to October 2020 and August to December 2021 (normal feeding group), or July to November 2022 (invention feeding group). Water-soluble dietary fiber: Fibergum® feed. Test Animals: General fattening pigs. Base Feed: Test Feed (manufactured by a domestic compound feed manufacturer). Normal Feeding Group (Control Group): No Test Substance. Invention Feeding Group: Group Fed with Fibergum® Feed-Added Feed. Fattening pigs were raised in three pig barns, each housing 100 or more pigs. They were either fed a normal diet or a pig feed containing 5 kg (approximately 0.17%) of the composition for preventing gastric ulcers in pigs of the present invention (Fibergum® feed) per 3.0 t of raw feed, and were raised as usual. The number of animals that had died from gastric ulcers or other causes up until the time of shipping was recorded, and the ratio of the number of animals that had died from gastric ulcers or from all causes to the total number of animals kept was calculated. ● Results The results are shown in Table 1 below. As described above, in the pigs fed the present invention, the number of deaths due to gastric ulcers was reduced by 23.8% compared to 2020 and by 43.9% compared to 2021, compared to the normal feeding group. Meanwhile, the total number of deaths, including those due to gastric ulcers, was also reduced by 21.5% and 29.8%, respectively. Furthermore, since the reduction in the number of deaths due to gastric ulcers was greater, it can be said that the effect of the pig gastric ulcer prevention composition and pig feed of the present invention on gastric ulcers is greater than the effect on other causes of death. Therefore, it was revealed that the pig gastric ulcer prevention composition and pig feed of the present invention are effective in preventing gastric ulcers in pigs and in enabling pig production with a high yield.

[0043] Example 2: A composition for preventing gastric ulcers in pigs and pig feed of the present invention were prepared, and the effectiveness of the composition and feed in preventing gastric ulcers in pigs was simultaneously investigated. Materials and Methods: Test Period: January to May 2023; Water-soluble dietary fiber: Fibergum® Feed; Test Animals: General fattening pigs; Base Feed: Test Feed (manufactured by a domestic compound feed manufacturer); Normal Feeding Group (Control Group): No test substance fed; Inventive Feeding Group: Group fed a diet supplemented with Fibergum® Feed. For each group, approximately the same number of fattening pigs (500 or more) were fed either a normal diet or a pig feed containing 0.2% of the composition for preventing gastric ulcers in pigs (Fibergum® Feed) of the present invention, and raised as usual. The number of pigs that died from gastric ulcers or other causes by the time of shipping (May) was recorded, and the percentage of deaths due to gastric ulcers or all causes relative to the total number of deaths was calculated. ●Results The results are as shown in Table 2 below. Thus, the pigs fed the present invention reduced the number of deaths due to gastric ulcers by 42.4% compared to the normal-fed group. This result was comparable to and reproducible with the results obtained in Example 1 (a 43.9% reduction compared to 2021). The total number of deaths, including those due to gastric ulcers, was also reduced by 17.0%. Furthermore, since the reduction in deaths due to gastric ulcers was greater, it can be said that the effect of the pig gastric ulcer prevention composition and pig feed of the present invention on gastric ulcers is greater than its effect on other causes of death. Therefore, it has become even more clear that the pig gastric ulcer prevention composition and pig feed of the present invention are effective in preventing gastric ulcers in pigs and in enabling high pig production yields. There was no difference in the intestinal pH of the pigs tested between the pigs fed the present invention and the normal-fed group.

[0044] <General Considerations on Examples 1 and 2> The results of these tests revealed the following about feeding Fibergum (registered trademark) feed: The composition for preventing gastric ulcers in pigs and the pig feed of the present invention are effective in preventing gastric ulcers in pigs. Furthermore, it was thought that of the composition for preventing gastric ulcers in pigs and the pig feed of the present invention, Fibergum (registered trademark) feed was particularly effective.

[0045] The present invention provides a nutritional supplement composition and pig feed that are highly versatile and excellent for managing the physical condition of pigs, and therefore the present invention will greatly contribute to the development of the pig feed production industry, the livestock industry, and related industries.

Claims

1. A composition for preventing gastric ulcer in pigs, comprising a water-soluble dietary fiber as a component for preventing gastric ulcer in pigs.

2. The composition for preventing gastric ulcer in pigs according to claim 1, wherein the water-soluble dietary fiber is gum arabic.

3. A pig feed comprising the composition for preventing gastric ulcer in pigs according to claim 1 and feed.

4. The pig feed according to claim 3, wherein the feed further comprises food residue or food pomace and water.

5. The pig feed according to claim 3, wherein the content of the composition for preventing gastric ulcer is 0.001 to 0.01 by weight based on 1 by weight of the feed.

6. The pig feed according to claim 3, which is in a solid shape.

7. A method for raising pigs, comprising the step of feeding the pigs with the composition for preventing gastric ulcer in pigs according to claim 1 or 2 or the pig feed according to any one of claims 3 to 6.

8. The method according to claim 7, wherein the pig feed is a feed obtained by mixing the composition for preventing gastric ulcer in pigs with feed.

9. The method according to claim 8, comprising preventing gastric ulcer in pigs with the composition for preventing gastric ulcer in pigs according to claim 1 or 2.

10. The method according to claim 7, wherein the water-soluble dietary fiber contained in the composition for preventing gastric ulcer or the pig feed is gum arabic.

11. The composition for preventing gastric ulcer in pigs according to claim 2, wherein the gum arabic is Fiber Gum Feed (registered trademark).

12. The pig feed according to claim 5, wherein the content of the composition for preventing gastric ulcer is 0.001 to 0.003 by weight based on 1 by weight of the feed.

13. The pig feed according to claim 12, wherein the feed further comprises food residue or food pomace and water.

14. The pig feed according to claim 13, which does not contain forage grass.

15. The composition for preventing gastric ulcer in pigs according to claim 1, further comprising a component other than the water-soluble dietary fiber as a component from acacia sap.