半胱胺对奶牛瘤胃微生物蛋白产量、产奶性能和氮排泄的影响  

Effects of Cysteamine on Ruminal Microbial Protein Production,Milk Performance and Nitrogen Excretion

作　　者：王玲[1] 孙友德[2] 刘锡武[2] 孙国强[1] 

机构地区：[1]青岛农业大学动物科技学院,青岛266109 [2]青岛市畜牧兽医研究所,青岛266100

出　　处：《动物营养学报》2015年第4期1262-1269,共8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-12-011-08)

摘　　要：本试验旨在研究半胱胺(cysteamine,CS)对奶牛瘤胃微生物蛋白产量、产奶性能和氮排泄的影响。选取年龄、体重、产奶量及泌乳期[(135±15)d]相近的荷斯坦奶牛40头,分为4组,对照组和试验1组、2组、3组分别补饲0、15、20和25 g/(d·头)CS。预试期14 d,正试期56 d。结果表明:1)试验组的瘤胃微生物蛋白产量显著或极显著高于对照组(P<0.05或P<0.01),试验1组、2组和3组分别比对照组提高27.27%、66.56%、55.42%。2)试验组产奶量显著高于对照组(P<0.05),分别比对照组提高18.97%、19.58%、11.25%。3)CS能显著或极显著提高乳脂率和乳蛋白率(P<0.05或P<0.01),显著降低乳体细胞数(P<0.05),以试验2组最低。4)在氮总排泄量上,试验组极显著低于对照组(P<0.01),试验1组、2组和3组分别降低16.24%、22.66%、9.92%。由此可见,本试验条件下,综合考虑瘤胃微生物蛋白产量、产奶量、乳成分含量及氮排泄指标,CS添加量以20 g/(d·头)最有利。This experiment was conducted to determine the effects of cysteamine （ CS） on microbial protein production, milk performance and nitrogen excretion. Forty Holstein lactating cows with similar age, body weight, milk yield and lactation stage [（135±15） d] were divided into 4 groups. The supplemental level of CS in control group, test groups 1, 2 and 3 was 0, 15, 20 and 25 g/（ d·head） , respectively. The pretest las-ted for 14 days, and the test lasted for 56 days. The results showed as follows： 1） ruminal microbial protein production in test groups was significantly increased by 27.27%, 66.56% and 55.42% compared with that in control group （P〈0.05 or P〈0.01）. 2） The cows in test groups 1, 2 and 3 had 18.97%, 19.58% and 11.25% greater daily yields of milk than those cows in the control group （ P〈0.05） . 3） CS could significantly increase milk fat percentage and milk protein percentage （ P〈0.05 or P〈0.01） , but significantly reduced milk somatic cell count （ P〈0.05） , especially the test group 2. 4） Compared with control group, total nitrogen ex-cretion in test groups was significantly reduced （ P〈0.01） , and was reduced by 16.24%, 22.66% and 9.92%in test groups 1, 2 and 3, respectively. Based on the data of ruminal microbial protein production, milk yield, milk composition content and nitrogen excretion indices, it can be concluded that the suitable supplemental lev-el of CS is 20 g/（ d·head） in dairy cows under the condition in the present study.

关 键 词：半胱胺 瘤胃微生物蛋白 产奶性能 氮排泄 

分 类 号：S823[农业科学—畜牧学] S816.7[农业科学—畜牧兽医]