日粮添加过瘤胃保护胆碱对喀斯特山区奶牛泌乳性能的影响及其延续效应研究  

Lactation performance and its carry-over response of dairy cows fed with rumen-protected choline in Karst area

作　　者：吴文旋[1] 杨艺[1] 段永邦[1] 李凌云[1] 

机构地区：[1]贵州大学动物科学学院,贵阳市花溪区550025

出　　处：《中国饲料》2011年第17期12-14,共3页China Feed

基　　金：国家自然科学基金(30901038);动物营养学国家重点实验室开放课题(2004DA125184F1115);贵州省农业科技攻关项目(黔科合NY字[2009]3085);贵州省科学技术基金(黔科合J字[2008]2258);贵州大学引进人才科研项目([2007]002)资助

摘　　要：研究日粮添加过瘤胃胆碱(RPC)对喀斯特山区奶牛泌乳性能及其延续效应的影响。以10头喀斯特山区泌乳盛期奶牛为试验动物,进行自身对照试验设计。试验按照对照期、正试期(试验Ⅰ期、试验Ⅱ期)、延续效应期(试验Ⅲ期)连续进行,每期12 d。其中,正试期RPC每头奶牛的添加水平为40 g/d;试验Ⅲ期停喂RPC以观察其是否可对奶产量产生延续效应。结果表明,对照期、试验Ⅰ期、试验Ⅱ期、试验Ⅲ期奶牛干物质采食量差异不显著(P>0.05)。试验Ⅰ期奶产量显著高于其他3期(25.5∶27.7∶26.5∶24.8 kg/d,P<0.05);正试期(试验Ⅰ期、试验Ⅱ期)奶产量显著高于对照期、延续效应期(25.5∶27.2∶24.8 kg/d,P<0.05);当停喂RPC后,延续效应期奶产量即下降至对照期水平(25.5∶24.8 kg/d,P>0.05)。奶成分不受日粮添加RPC的影响(P>0.05),乳脂、乳固型物含量数值上较对照期有所增加。由此可见,日粮添加RPC有利于提高喀斯特山区奶牛泌乳性能,但未对奶产量表现出延续效应,生产实践中需持续添加。The study was conducted to investigate the lactation performance and its carry-over response of dairy cows fed rumen-protected choline （RPC）.Ten peak-lactation dairy cows,from Karst area,were used as experimental animals and were allocated to self-pair control experimental design.Four continuous and individual 12-day duration were set to be control phase,trial phase （trial phase I and trial phase II ）,and carry-over phase （trial phase III ）,respectively.The RPC （40 g/d） was not provided in trial III phase for the determination of carry-over effect of RPC on milk yield.The results were as follows：there was no difference in dry matter intake for the continuous 4-trial durations （P 〉 0.05）.Feeding of RPC in trial phase I resulted in higher milk yield than other 3 trial durations （25.5：27.7：26.5：24.8 kg/d,P 〈 0.05）.The pooled trial phase I and trial phase II had also more milk production compared with control phase and the carry-over phase （25.5：27.2：24.8 kg/d,P 〈 0.05）.Milk yield was decreased to be similar to control level in the carry-over phase,without the provision of RPC （25.5：24.8 kg/d,P 〉 0.05）.Milk compositions were unaffected by the addition of RPC （P 〉 0.05）,with minor increase of milk fat and solid content value. In conclusion,there was a positive effect of RPC supplementation on lactation performance.However, RPC did not carry over to increase milk yield, and therefore,it needed to be added continuously in the practice.

关 键 词：过瘤胃保护胆碱 泌乳性能 延续效应 喀斯特山区 奶牛 

分 类 号：S816.7[农业科学—饲料科学]