动物营养学报2011，Vol.23Issue(9)：1505-1512,8.DOI:10.3969/j.issn.1006-267x.2011.09.008
饲粮能氮瘤胃释放同步化对泌乳奶牛瘤胃发酵、生产性能及氮平衡的影响
Synchronization of Dietary Energy and Nitrogen Release on Rumen Fermentation, Performance and Nitrogen Balance in Lactating Holstein Cows
摘要
Abstract
This experiment was conducted to study the effect of synchronization of dietary energy and nitrogen release on rumen fermentation, performance and nitrogen balance in lactating Holstein cows. A 4 ×4 Latin square design was used in this study. Four Holstein cows in mid-lactation fitted with ruminal cannulas were fed with four isoenergetic and isonitrogenous diets varying in synchronization index (SI) (diet I ,SI =0.95; diet Ⅱ ,SI = 0.90; diet Ⅲ SI = 0.83; diet Ⅳ , SI = 0.77). Different diets contained similar CP and energy levels. The results showed as follows: 1) Rumen pH was decreased as synchrony level of diets increased (P < 0.05), while concentrations of acetate, propionate, butyrate, total-volatile fatty acid and NH3-N, as well as rumen liqusid volume, liquid dilution rate and microbial N outflow did not differ significantly among the four diets with different SI values (P>0.05). 2) Milk yield, milk protein and lactose tended to be higher when syn chrony level of the diets was higher (P < 0.05), while milk compositions including milk fat, lactose, protein, and urea N were similar for cows fed with different diets (P > 0. 05). 3) Milk N and fecal N loss were in creased when synchrony level of the diets increased (P <0. 05) , while no significant difference was detected on urinary N, although it decreased as synchrony level of the diet increased (P > 0.05); Synchrony of diet also had no effect on apparent digestibility of nitrogen and efficiency of N intake used for milk N (P > 0.05). The results indicate that a greater degree of synchronization of dietary energy and nitrogen release has positive effect on microbial protein synthesis and milk protein production for dairy cows.关键词
能氮同步化/泌乳奶牛/瘤胃发酵/生产性能/氮平衡Key words
synchronization of energy and nitrogen supply/ dairy cows/ rumen fermentation/ performance/nitrogen balance分类
农业科技引用本文复制引用
李鹏,林雪彦,苏鹏程,刘桂梅,艾金涛,王中华..饲粮能氮瘤胃释放同步化对泌乳奶牛瘤胃发酵、生产性能及氮平衡的影响[J].动物营养学报,2011,23(9):1505-1512,8.基金项目
国家现代农业(奶业)产业技术体系建设专项资金(CARS-37)资助 （奶业）
