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1.
长期以来．人们一直认为动物采食的日粮蛋白质在消化道内降解成小肽和游离氨基酸．游离氨基酸可以被动物直接吸收利用；而小肽只有进一步降解成游离氨基酸才能被利用。后来发现，蛋白质降解产生的小肽也能被动物直接吸收。从此．小肽在动物营养中的应用开始了广泛的研究。水产养殖的研究表明．添加适量的小肽可促进鱼类的生长，增强水产动物的免疫力和提高成活率、矿物元素利用率、饲料转化率。本文针对小肽的吸收与代谢机制、影响小肽吸收和释放的因素以及小肽在水产养殖中的应用等方面做一论述。 相似文献
2.
在动物胃肠内完整吸收小肽被认为是一种重要的生理现象,它打破了同时也完善了传统蛋白质代谢理论。本文综述了小肽在动物体内的营养作用,影响小肽释放、吸收和利用的因素,生产小肽的基本原理与方法以及小肽在动物生产中的应用效果。 相似文献
3.
小肽是动物降解蛋白质为氨基酸过程中的中间产物,是动物的重要营养物质。它能在动物胃肠内被完整的吸收,这被认为是一种重要的生理现象,完善了传统蛋白质代谢理论。文中就小肽的分类和吸收特点、小肽的功能、小肽在家禽养殖中的应用效果及其应用前景作了简要综述。 相似文献
4.
自20世纪60年代起,人们逐渐认识到除了游离氨基酸外,小肽也能够被动物直接吸收利用。肽除了对动物的营养作用外,某些有生理活性的肽直接被动物吸收利用后,还具有免疫、神经递质、抗氧化等活性。作者对近年来有关小肽在动物科学领域中的营养研究进行了综述,除了分析其对动物的营养作用外,还重点阐述了小肽的吸收转运及其在动物生产中的应用。 相似文献
5.
长期以来,人们一直认为动物采食的日粮蛋白质在消化道内降解成小肽和游离氨基酸,游离氨基酸可以被动物直接吸收利用,而小肽只有进一步降解成游离氨基酸才能被利用,后来发现,蛋白质降解产生的小肽也能被动物直接吸收。从此,小肽在动物生产中的应用开始了广泛的研究。众多研究表明,小肽具有促进氨基酸的吸收, 相似文献
6.
小肽是蛋白质的主要消化产物,在氨基酸的消化、吸收和代谢中起着非常重要的作用。文章就小肽在单胃动物和反刍动物的吸收机制、小肽的营养作用和影响小肽吸收的因素以及小肽在蛋白质代谢中的作用分别加以综述。 相似文献
7.
小肽在动物胃肠内被完整吸收被认为是一种重要的生理现象，它既打破了、同时也完善了传统蛋白质代谢理论。综述了小肽在动物体内的营养作用，以及影响小肽释放、吸收和利用的因素．并介绍了生产小肽的基本原理与方法以及小肽在动物生产中的应用效果。 相似文献
8.
根据外源氨基酸的添加不能充分满足动物的生产需要这一生产实际,营养学家们逐渐认识到小肽在动物营养中的重要作用。作者就小肽的吸收机制、营养作用和影响小肽吸收、利用的因素等方面进行探讨,.最后提出小肽的研究方向。 相似文献
9.
小肽是动物降解蛋白质过程中的中间产物,是由2个或2个以上的氨基酸以肽键相连的化合物,其吸收在总饲粮蛋白质的吸收中有重要作用。本文综述肠道对小肽的吸收利用及其调控机制,肠道小肽感应与胃肠激素分泌和摄食调控,肠道小肽利用对肠道健康的调控,以及小肽在动物营养中的应用。 相似文献
10.
小肽是动物降解蛋白质过程中产生的中间产物，是由2个或2个以上的氨基酸以肽键相连的化合物，许多试验已经证明小肽对动物的重要性。笔者就有关单胃动物和反刍动物小肽吸收机制及其吸收特点，小肽对各种动物的生理营养功能。小肽制剂的3种生产途径和小肽在畜牧生产中的应用等方面的研究现状进行综述。 相似文献
11.
In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario. Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously. 相似文献
13.
In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%). Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada. 相似文献
14.
In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%). 相似文献
15.
In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection. 相似文献
17.
In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium. 相似文献
18.
In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated. Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively. 相似文献
19.
In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%). 相似文献
20.
In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%). Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada. 相似文献
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