摘要
本试验旨在研究牛至油(Oo)和过瘤胃赖氨酸(RPLys)组合添加对奶牛产奶性能和氮排泄的影响。选取年龄、体重、胎次、产奶量、乳成分及泌乳期[(105±15) d]相近,体况良好的荷斯坦奶牛40头,随机分为10组,每组4头。对照组(C组)饲喂基础饲粮,各试验组在基础饲粮中添加不同水平组合的Oo和RPLys。其中,Oo设3个添加水平,分别为11.5(L)、13.0(M)、14.5 g/(d·头)(H); RPLys设3个添加水平,分别为27.5(L)、30.0(M)、32.5 g/(d·头)(H),共组成9个组合,分别为LL、LM、LH、ML、MM、MH、HL、HM、HH组(第1个字母为Oo添加水平,第2个字母为RPLys添加水平)。预试期15 d,正试期60 d。结果显示:1)各试验组的产奶量均极显著高于C组(P<0.01),以MM组最高。2)各试验组的乳脂率和乳蛋白率不同程度地高于C组,且以MM组最高,极显著高于C组(P<0.01);各试验组的乳体细胞数均极显著低于C组(P<0.01),以M M组最低。3)各试验组的乳氮、氮沉积和氮表观消化率均极显著高于C组(P<0.01),且均以MM组最高; LL、LM、LH、ML、MM、MH、HL、HM、HH组总氮排泄量比C组分别降低了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)和6.95%(P<0.01),以MM组最低。本试验结果表明,饲粮中联合添加Oo和RPLys可以提高奶牛的产奶性能、降低氮排泄量;综合考虑以上各指标,最佳组合为Oo 13.0 g/(d·头)、RPLys 30.0 g/(d·头)。
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 composition 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 diet 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,M L,M M,M H,HL,HM and HH groups (first letter indicated Oo supplemental level,and the second letter indicated RPLys supplemental level),respectively. The pre-experiment lasted for15 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 M M group had the highest value. 2) M ilk fat percentage and milk protein percentage in experimental groups were higher than those in C group in different degrees,and both of them in M M group had the highest values,which were extremely significantly higher than those in C group (P < 0. 01);milk somatic cell count in experimental groups was extremely significantly reduced compared with C group (P<0.01),and M M 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 M M group had the lowest values;compared with C group,total nitrogen excretion in LL,LM,LH,M L,M M,M H,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 M M grou
作者
张凯祥
邢德芳
高许雷
滕乐帮
吕永艳
孙国强
ZHANG Kaixiang;XING Defang;GAO Xulei;TENG Lebang;LYU Yongyan;SUN Guoqiang(College of Animal Science and Technology,Qingdao Agricultural University,Qingdao 266109,China;Workstation of Animal Husbandry and Veterinary Medicine of Tuanwang for Laiiyang City,Laiyang 265217,China;Agriculture and Water Conservancy Bureau of Laoshan,Qingdao 266061,China;Animal Husbandry and Veterinary Bureau of Pingdu,Qingdao 266700,China)
出处
《动物营养学报》
CAS
CSCD
北大核心
2019年第3期1342-1351,共10页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
山东省现代农业产业技术体系牛产业创新团队(SDAIT-09-08)
关键词
牛至油
过瘤胃赖氨酸
产奶性能
氮排泄
oregano oil
rumen-protected lysine
lactation performance
nitrogen excretion
