Effects of Rumen-Protected Lysine on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

ZHANG Kaixiang, XING Defang, GAO Xulei, TENG Lebang, LYU Yongyan, SUN Guoqiang

doi:10.3969/j.issn.1006-267x.2018.12.025

2018 , Vol. 30 >Issue 12: 4971 - 4979

DOI: https://doi.org/10.3969/j.issn.1006-267x.2018.12.025

Molecular Nutrition

Effects of Rumen-Protected Lysine on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Workstation of Animal Husbandry and Veterinary Medicine of Tuanwang for Laiiyang City, Laiyang 265217, China;
3. Agriculture and Water Conservancy Bureau of Laoshan, Qingdao 266061, China;
4. Animal Husbandry and Veterinary Bureau of Pingdu, Pingdu 266700, China

Received date: 2018-06-06

Online published: 2018-12-19

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Abstract

This experiment was conducted to determine the effects of rumen-protected lysine (RPLys) on microbial protein (MCP) production, milk performance and nitrogen excretion of dairy cows. Forty healthy Holstein lactating cows with similar age, body weight, parity, milk yield, milk composition and lactation period [(90±15) d] were randomly divided into 4 groups with 10 cows per group. The supplement level of RPLys in control group and test groups 1, 2 and 3 was 0, 25, 30 and 35 g/(d·head), respectively. The pretest lasted for 15 d, and the test lasted for 60 d. The results showed as follows: 1) ruminal MCP production in test groups 1, 2 and 3 was increased by 5.34% (P<0.05), 14.76% (P<0.01) and 10.06% (P<0.01) compared with control group, respectively. 2) Milk yield in test groups 1, 2 and 3 was increased by 5.70%(P<0.05), 9.98% (P<0.01) and 7.87%(P<0.05) compared with control group, respectively; milk protein percentage in test group 2 was extremely significantly higher than that in control group (P<0.01), and it in test group 3 was significantly higher than that in control group (P<0.05). 3) Nitrogen total excretion in test groups 1, 2 and 3 was reduced by 5.70% (P<0.01), 9.98% (P<0.01) and 7.87% compared with control group, respectively. It can be seen that the addition of RPLys to diets can increase ruminal MCP production, decrease the nitrogen excretion, and improve the milk performance of dairy cows. Under the present experimental conditions, the optimal supplemental level of RPLys in the diet of dairy cows is 30 g/(d·head) based on comprehensive consideration of above indexes.

Key words： rumen-protected lysine; dairy cows; ruminal microbial protein; milk performance; nitrogen excretion

Cite this article

ZHANG Kaixiang, XING Defang, GAO Xulei, TENG Lebang, LYU Yongyan, SUN Guoqiang . Effects of Rumen-Protected Lysine on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2018 , 30(12) : 4971 -4979 . DOI: 10.3969/j.issn.1006-267x.2018.12.025

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