摘要
[目的]研究过瘤胃赖氨酸(RPLys)、过瘤胃蛋氨酸(RPMet)对反刍动物生产性能及氮排放的影响.[方法]以荷斯坦牛为例,选用40 头体重600 kg左右且泌乳期60 d左右的健康荷斯坦牛进行试验,随机分为4 组,每组10 头,分别为L组(日粮中补充30 g/头·d RPLys)、M组(日粮中补充30 g/头·d RPMet)、LM组(日粮中补充RPLys、RPMet各30 g/头·d)和CK组(不添加RPLys、RPMet),分别测定日均干物质采食量、日均产奶量、乳脂率、乳蛋白率、乳糖率、乳体细胞数、粪氮、尿氮、氮总排放量.[结果]与CK组相比,L组、M组、LM组日均干物质采食量、乳糖率无显著变化(P＞0.05),日均产奶量、乳蛋白率显著增加(P＜0.05),乳体细胞数、粪氮、尿氮、氮总排放量均显著降低(P＜0.05);L组乳脂率无显著变化(P＞0.05),M组、LM组乳脂率显著增加(P＜0.05).[结论]RPLys和RPMet可改善奶牛生产性能,调节乳房健康水平,降低氮排放,减少环境污染,助力畜牧业绿色高效发展.
Abstract
[Objective]To study the effects of rumen-protected lysine(RPLys)and rumen-protected methionine(RPMet)on the production performance and nitrogen emission of ruminants.[Method]Taking Holstein cows as an example,selected 40 healthy Holstein cows with a body weight of about 600 kg and a lactation period of about 60 days for this experiment.They were randomly divided into 4 groups,with 10 cows in each group,namely L group(supplemented with 30 g/head·d RPLys in the diet),M group(supplemented with 30 g/head·d RPMet in the diet),LM group(supplemented with 30 g/head·d of RPLys and RPMet each in the diet)and CK group(without the addition of RPLys and RPMet).Measure daily dry matter intake,daily milk yield,milk fat rate,milk protein rate,lactose rate,milk somatic cell count,fecal nitrogen,urinary nitrogen,and total nitrogen emission separately.[Result]Compared with CK group,L group,M group,and LM group had no significant changes in daily dry matter intake and lactose rate(P＞0.05),while the daily milk yield and milk protein rate significantly increased(P＜0.05).The milk somatic cell count,fecal nitrogen,urinary nitrogen,and total nitrogen emission were significantly reduced(P＜0.05).There was no significant change in the milk fat rate of L Group(P＞0.05),while the milk fat rate of M and LM Group increased significantly(P＜0.05).[Conclusion]RPLys and RPMet can improve the production performance of cows,regulate the health level of cow breasts,reduce nitrogen emissions,reduce environmental pollution,and help promote the green and efficient development of the animal husbandry.
基金项目
山东省科技型中小企业创新能力提升工程项目(2023TSGC0594)
国家科技期刊平台
NSTL
万方数据