共查询到20条相似文献，搜索用时 46 毫秒
1.
功能性氯基酸——精氦酸（Arg）具有重要的生理、代谢和营养作用,几乎机体中所有组织均利用Arg合成胞浆蛋白和核蛋白,精氨酸在促进肌肉蛋白质合成、增强机体的免疫力、细胞分裂、伤口复尿和激素分泌等各种生理过程中,也都有着重要的角色。Arg为条件性必需氨基酸,在应激状态下和特殊生长阶段,为必需氨基酸,仔猪体内合成的精氨酸不能满足生理代谢需要。但是精氨酸的吸收与赖氨酸等桔抗,因此,对精氨酸及其内源性合成调控研究具有极大的应用价值和实践意义。精氨酸生素（Arginineactivatoradditive,AAA）是N-乙酰谷氨酸（N-acetylglutamate,NAG）的类似物,作为一种新型的功能性氨基酸,可以有效调控内源性精氨酸合成,进而促进动物生长性能。本文就精氨酸和精氨酸生素特别是其对机体内源性精氨酸合成调控及其在仔猪和母猪中的研究进展与应用作一综述。 相似文献
2.
精氨酸对于幼龄仔猪是一种必需氨基酸,具有重要的生理代谢和营养作用。作为一种营养调节剂,无论是在日粮中添加精氨酸,还是添加精氨酸生素(AAA),N-氨甲酰谷氨酸(NCG),N-乙酰谷氨酸(NAG)调节内源性精氨酸的合成,都是提高仔猪体内精氨酸含量、促进断奶仔猪生长发育的有效措施。本文就精氨酸对断奶仔猪生长性能、肠道健康、抗氧化应激的影响等三方面进行综述。 相似文献
3.
精氨酸生素（Arginineactivatoradditive，AAA）是N-乙酰谷氨酸（N—acetylglutamate，NAG）的类似物，是内源性精氨酸（Arg）合成过程中的限制因素之一，可以很大程度上调控内源性Arg的合成。 相似文献
4.
N-氨甲酰谷氨酸(NCG)是精氨酸合成链中N-乙酰谷氨酸(NAG)的类似物,可替代NAG作为机体合成精氨酸的外源前体物质,在畜禽生产具有增强机体免疫能力、促进生长发育、提高繁殖性能、改善胴体品质等作用.文章结合近年国内外研究结果就NCG的主要生物学作用及其在猪生产的应用效果作一综述,以期为NCG在猪生产中的广泛应用提供... 相似文献
5.
N-氨甲酰谷氨酸是N-乙酰谷氨酸稳定的结构类似物,在动物体内与N-乙酰谷氨酸一样可以激活二氢吡咯-5-磷酸合成酶及氨甲酰磷酸合成酶Ⅰ,从而促进内源性精氨酸的合成,进而调节机体的营养代谢。本文综述了N-氨甲酰谷氨酸在猪营养中应用的研究进展。 相似文献
6.
精氨酸是一种条件性必需氨基酸,在肉羊的繁殖性能和生长性能上表现出良好的改善作用。N-乙酰谷氨酸(NAG)是动物机体内天然存在的精氨酸内源激活剂,N-氨甲酰谷氨酸(NCG)作为其结构类似物,能促进肉羊机体精氨酸的内源合成,在肉羊饲养上具有替代精氨酸的潜在价值。本文阐述了NCG的作用机理和代谢途径,并综述了精氨酸和NCG对肉羊繁殖性能、生产性能和屠宰性能等方面影响的研究进展,以期为NCG在今后肉羊实际生产中的应用提供参考。 相似文献
7.
<正>N-氨甲酰谷氨酸(NCG)是一种白色细小粉末,不溶于水,有效成分含量为98.3%。国内外研究资料表明,NCG作为一种绿色高效的功能性氨基酸促进剂,具有极高的药用价值[1]。作为精氨酸(Arg)内源激活剂可以提高机体Arg含量,改善动物生产水平和健康状况。NCG是尿素循环中鸟氨酸生成瓜氨酸的中间体N-乙酰谷氨酸(NAG)的类似物,是内源性Arg合成途径中的必需辅助因子和限制性因素之一[2]。而 相似文献
8.
精氨酸是一种条件性必需氨基酸,在动物细胞信息传递和营养代谢中起重要作用。N-氨甲酰谷氨酸(N-carbamylglutamate,NCG)能够促进内源性精氨酸的合成,其成本为精氨酸的10%,可广泛利用于实际生产中。本文主要介绍精氨酸功能、NCG和内源性精氨酸合成、NCG在猪生产各阶段的应用情况与展望。 相似文献
9.
<正>精氨酸是动物体内一种重要的碱性氨基酸,在许多代谢过程中发挥重要作用。近年来,国内外研究证实,日粮中添加L-精氨酸能提高猪的日增重,能降低料肉比、改善肉品质和提高抗氧化能力,同时通过提高细胞免疫和体液免疫改善机体免疫功能,但受添加成本和配方空间的影响,外源添加精氨酸的方法未能在实际生产中得到应用。N-氨甲酰谷氨酸(NCG)是N-乙酰谷氨酸(NAG)的结构类似物,NAG是精氨酸内源性合成途径中 相似文献
10.
N-氨基甲酰谷氨酸是一类新型饲料添加剂,具有相对成本低,效果明显,体内代谢稳定等特点。它能有效激活仔猪内源性精氨酸的合成,改善仔猪肠道功能,提高仔猪免疫性能,在畜牧业生产中被广泛使用。本文就N-氨基甲酰谷氨酸的生物学功能及在仔猪生产中的应用作一综述。 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 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
18.
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
19.
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
|
