动物营养学报2017，Vol.29Issue(9)：3202-3210,9.DOI:10.3969/j.issn.1006-267x.2017.09.023
过瘤胃蛋氨酸和肉桂醛组合添加对奶牛产奶性能及氮排泄的影响
Effects of Combined Supplementation of Rumen-Protected Methionine and Cinnamic Aldehyde on Lactation Performance and Nitrogen Excretion of Dairy Cows
摘要
Abstract
This experiment was conducted to determine the effects of combinations of rumen-protected methionine (RPMet) and cinnamic aldehyde (CA) on lactation performance and nitrogen excretion of dairy cows.Forty Holstein lactating dairy cows with similar age,body weight,parity,milk yield,milk composition and lactation period [(90±15) days post-calving] were divided into 10 groups with 4 cows per group.Control (C) group was fed a basal diet,and experimental groups were supplemented with different levels of RPMet [20 (L),25 (M) and 30 (H) g/(d·head)] and CA [15 (L),18 (M) and 21 (H) g/(d·head)] to constitute 9 combinations,which were named as LL,ML,HL,LM,MM,HM,LH,MH and HH (first letter indicated RPMet supplemental level,and the second letter indicated CA supplemental level),respectively.The pre-experiment lasted for 15 days,and the experiment lasted for 60 days.The results showed as follows: 1) except LH group,milk yield in experimental groups was significantly higher than that in C group (P<0.05 or P<0.01),HL group was the highest.2) Milk fat percentage and milk protein percentage in experimental groups were higher than those in C group,and HL was the highest,which was significantly higher than C group (P<0.01);milk somatic cell count in experimental groups was higher than those in C group,and HL was the highest,which was significantly higher than C group (P<0.01).3) Except LH group,compared with C group,nitrogen apparent digestibility and nitrogen conversion efficiency were significantly increased (P<0.05 or P<0.01),and HL group was the highest;compared with C group,total nitrogen excretion in LL,ML,HL,LM,MM,HM,LH,MH and HH groups was decreased by 17.45% (P<0.01),18.79% (P<0.01),20.80% (P<0.01),10.41% (P<0.01),12.49% (P<0.01),15.22% (P<0.01),3.37% (P>0.05),5.12%(P<0.05) and 7.43% (P<0.05),respectively.The results indicate that combined supplementations of RPMet and CA can improve lactation performance and reduce nitrogen excretion;considering all the above indexes,the optimal combination is 30 g/(d·head) RPMet and 15 g/(d·head) CA.关键词
过瘤胃蛋氨酸/肉桂醛/产奶性能/氮排泄Key words
rumen-protected methionine/cinnamic aldehyde/lactation performance/nitrogen excretion分类
农业科技引用本文复制引用
张成喜,孙友德,刘锡武,孙国强..过瘤胃蛋氨酸和肉桂醛组合添加对奶牛产奶性能及氮排泄的影响[J].动物营养学报,2017,29(9):3202-3210,9.基金项目
山东省现代农业产业技术体系牛产业创新团队(SDAIT-09-08) （SDAIT-09-08）
