动物营养学报2019，Vol.31Issue(3)：1342-1351,10.DOI:10.3969/j.issn.1006-267x.2019.03.041
牛至油和过瘤胃赖氨酸组合添加对奶牛产奶性能和氮排泄的影响
Effects of Combined Supplementation of Oregano Oil and Rumen-Protected Lysine on Lactation Performance and Nitrogen Excretion of Dairy Cows
摘要
Abstract
This experiment was conducted to determine the effects of combined supplementation of oregano oil (Oo) and rumen-protected lysine ( RPLys) on lactation performance and nitrogen excretion of dairy cows. Forty healthy Holstein lactating dairy cows with similar age, body weight, parity, milk yield, milk composi-tion and lactation period [ (105±15) days post-calving) ] were divided into 10 groups with 4 cows per group. The cows in control ( C) group were fed a basal diet, while those in experimental groups were fed the basal di-et supplemented with different supplemental levels of Oo [11.5 ( L) , 13.0 ( M) and 14.5 g/( d·cow) ( H) ] and RPLys [ 27.5 ( L) , 30.0 ( M) and 32. 5 g/( d·cow) ( H) ] to constitute 9 combinations, which were named as LL, LM, LH, ML, MM, MH, HL, HM and HH groups ( first letter indicated Oo supplemental level, and the second letter indicated RPLys supplemental level) , respectively. The pre-experiment lasted for 15 days, and the experiment lasted for 60 days. The results showed as follows: 1) milk yield in experimental groups was extremely significantly higher than that in C group ( P<0.01) , and it in MM group had the highest value. 2) Milk fat percentage and milk protein percentage in experimental groups were higher than those in C group in different degrees, and both of them in MM group had the highest values, which were extremely sig-nificantly higher than those in C group ( P<0. 01) ; milk somatic cell count in experimental groups was ex-tremely significantly reduced compared with C group ( P<0.01) , and MM group was the lowest. 3) Compared with C group, milk nitrogen, nitrogen deposition and nitrogen apparent digestibility in experimental groups were extremely significantly increased ( P<0.01) , and all of them in MM group had the lowest values; com-pared with C group, total nitrogen excretion in LL, LM, LH, ML, MM, MH, HL, HM and HH groups was decreased by 6.63% ( P<0.01) , 9.29% ( P<0.01) , 7.73% ( P<0.01) , 11.81% ( P<0.01), 18.21% ( P<0.01) , 15.06% ( P<0.01) , 10.83% ( P<0.01) , 11.27% ( P<0.01) and 6.95% ( P<0.01) , respectively, and MM group was the lowest. The results indicate that combined supplementations of Oo and RPLys can im-prove lactation performance and reduce nitrogen excretion; considering all the above indexes, the optimal com-bination is 13.0 g/( d·cow ) Oo and 30. 0 g/( d·cow) RPLys. [ Chinese Journal of Animal Nutrition, 2019, 31(3) :1342-1351]关键词
牛至油/过瘤胃赖氨酸/产奶性能/氮排泄Key words
oregano oil/rumen-protected lysine/lactation performance/nitrogen excretion分类
农业科技引用本文复制引用
张凯祥,邢德芳,高许雷,滕乐帮,吕永艳,孙国强..牛至油和过瘤胃赖氨酸组合添加对奶牛产奶性能和氮排泄的影响[J].动物营养学报,2019,31(3):1342-1351,10.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）
