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近期猪低蛋白日粮研究进展 总被引:3,自引:1,他引:2
低蛋白日粮具有节省成本、提高能量水平、降低氮污染等经济的和环境的优势。利用猪的理想蛋白比例、采用可消化氨基酸和净能系统等技术配制以玉米和豆粕为主要原料的猪日粮时,可以不对日粮粗蛋白水平做最低限制。研究表明,猪日粮的粗蛋白水平在NRC推荐标准上降低4%,其饲养效果与限制最低粗蛋白水平的日粮相同,而且能使氮的排出量显著减少。 相似文献
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近年来低蛋白平衡氨基酸日粮在畜禽上的研究已经取得了长足的进展。伴随着国际形势的急剧变化,中美贸易摩擦所导致的蛋白饲料缺口为低蛋白日粮的全面应用提供了契机。低蛋白日粮凭借其巨大的优势,包括减少蛋白饲料消耗,减少氮排放,甚至改善动物生长性能,拥有十分广阔的应用前景。该文总结了近年来低蛋白日粮的研究概况,并且整理了其对不同畜禽品种的研究进展,以期为低蛋白日粮在畜禽养殖业的全面推广应用提供借鉴。 相似文献
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低蛋白氨基酸平衡是养猪业中不可或缺的一种日粮模式,以理想蛋白质和氨基酸平衡为理论基础,在不影响生长性能的前提下,将日粮中粗蛋白质水平从NRC(1998)推荐水平的基础上降低2%~4%,同时合理添加合成氨基酸来满足畜禽的需要。与传统日粮相比,低蛋白氨基酸平衡日粮具有提高蛋白利用效率、节约饲料成本、提高动物生产性能、改善动物肠道健康、提高肉品质、降低环境污染等优点。文章从低蛋白氨基酸平衡日粮对猪的生长性能、氮排泄、肠道菌群、肉品质这四个方面的影响研究进展进行综述,为低蛋白氨基酸平衡日粮在猪生产中的应用提供理论参考。 相似文献
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低蛋白氨基酸平衡日粮是基于理想蛋白质的概念而建立起来的一种低蛋白日粮。近年来由于饲料原料价格不断上涨,特别是蛋白质原料的缺乏,加之随着社会的发展,人们对环境保护的呼声越来越高,而畜牧生产过程中,由于高蛋白饲料引起的环境污染也越来越严重,因此降低日粮中蛋白的含量,又不会减少畜产品的产量和质量,成为了现代社会对畜牧生产提出的新要求。文章就低蛋白氨基酸平衡日粮的理论依据和在养猪生产中的应用效果进行了综述。 相似文献
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畜禽低蛋白日粮的研究概况 总被引:3,自引:0,他引:3
蛋白质是生命过程中的重要物质,是组成机体结构物质(细胞的组成)、体内代谢活性物质(激素、酶、免疫抗体)的主要成分,是组织更新、修补的原料。蛋白质占动物机体固形物总量的50%左右,肌肉、肝、脾、肾等实质器官的蛋白质含量可高达80%以上,所以,饲料中蛋白质的供应对畜禽生命和生产都具有重要的作用。然而,随着世界人口的增多、畜牧业的发展,蛋白质饲料缺乏。另外,畜牧业生产对环境造成的负面效应即畜禽排泄物中氮对土壤和水的污染,迫使人们提出一种新的畜禽饲养策略:降低氮摄入量和保持氨基酸的充足供给以满足动物的需… 相似文献
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我国是一个饲料生产大国,饲料蛋白质原料资源相对匮乏,是一个饲料蛋白原料纯进口国。以理想蛋白模式和氨基酸回肠标准消化率(SID)数据基础配制平衡15~30kg小猪日粮,降低日粮中CP含量1.5%~4.0%,并不会影响其生长性能,且能降低饲养成本,提高养殖综合效益。 相似文献
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Fish meal as a protein supplement in ruminant diets: a review 总被引:1,自引:0,他引:1
Fish meal (FM) as a protein supplement in ruminant diets is presented to illustrate production responses to FM supplementation and to explain the possible factors that may affect the magnitude of these responses. Positive responses are consistently detected when FM is fed to nonruminants, but the responses when fed to ruminants have lacked consistency. Research indicates that ruminal protein degradation of FM is affected by processing factors including type and freshness of fish, addition of preservatives, stabilization of fat, type of dryer used, temperature and duration of heating, and the amount of fish solubles added back to the meal. Performance data published in the last two decades have been categorized into body weight gain and milk yield and composition. Fish meal was more effective in improving body weight gain in young than in finishing ruminants and in males than in females or castrated males. Daily gains and feed efficiencies were higher when FM supplemented medium- or poor-quality silages than when it was added to high-quality silages. No significant advantage was found for replacing protein sources that were highly ruminally degradable with FM in high-corn diets fed to growing ruminants. Milk yield and milk protein concentration were improved by FM supplementation of low-concentrate diets fed to cows in early lactation. However, milk fat percentage was negatively affected by FM supplementation. Reproduction data indicated that body gain and conception rates of high-producing cows were improved by supplementing their diets with FM during early lactation. Results suggest a significant advantage of FM supplementation to ruminant diets if the physiological status of the animal and the quality of the dietary ingredients are taken into account. 相似文献
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本文介绍了猪营养中低蛋白质日粮应用的研究进展。研究结果表明,利用净能体系和以回肠真可消化氨基酸为基础的理想蛋白质体系,在猪日粮中添加合成氨基酸,可以将猪日粮的粗蛋白质水平降低3~4个百分点,不但不会降低猪的生长性能和胴体品质,而且能在提高这些指标的同时,节约饲料成本,改善猪的健康,减少氮排出,提高养猪利润和环保效益。 相似文献
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Studies on sodium bentonite in ruminant diets containing urea 总被引:1,自引:0,他引:1
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1. In the first experiment, diets containing 14, 16, 18, 20, 22 or 24% protein with no methionine supplementation were tested, while in the second experiment diets containing 16, 18 and 20% supplemented with methionine to give 90, 100 or 110% of the recommended N.R.C. levels were compared with an unsupplemented 24% protein diet.
2. Methionine supplementation of the low protein diets stimulated faster gains than the unsupplemented diets but not enough to surpass the response to the 24% protein control diet.
3. It was concluded that a high protein diet unsupplemented with methionine was more economical to feed to broilers than supplemented low protein diets. 相似文献
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饲用微生态制剂--酵母培养物及其在反刍动物中的应用 总被引:9,自引:1,他引:9
酵母培养物是指在特定工艺条件控制下由酵母菌在特定的培养基上经过充分的厌氧发酵后形成的微生态制品,它主要由酵母细胞外代谢产物、经过发酵后变异的培养基和少量已无活性的酵母细胞所构成。代谢产物是对细胞外各类代谢物的总称,这其中有些物质是为人们所熟悉的,如肽、有机酸 相似文献