Effects of Small Peptides on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

WU Dandan; TENG Lebang; LUAN Zhengqing; SUN Guoqiang

doi:10.3969/j.issn.1006-267x.2016.04.017

2016 , Vol. 28 >Issue 4: 1090 - 1098

DOI: https://doi.org/10.3969/j.issn.1006-267x.2016.04.017

RUMINANT NUTRITION

Effects of Small Peptides on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows

WU Dandan ,
TENG Lebang ,
LUAN Zhengqing ,
SUN Guoqiang

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Bureau of Animal Husbandry and Veterinary Medicine of Pingdu, Qingdao 266700, China

Received date: 2015-11-06

Online published: 2016-04-11

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Abstract

This experiment was conducted to determine the effects of small peptides(SP) on ruminal microbial protein production, milk performance and nitrogen excretion of dairy cows. Forty Holstein cows with similar age, body weight, milk yield and lactation stage [(45±15) days in milk] were divided into 4 groups with 10 cows per group. The supplement level of SP in control and test groups 1, 2 and 3 was 0, 50, 100 and 150 g/(d·head), respectively. The pretest lasted for 15 days, and the test lasted for 60 days. The results showed as follows:1) ruminal microbial protein production in test groups 1, 2 and 3 was significantly increased by 17.38%, 22.94% and 12.22% compared with that in control group(P<0.05). 2) Test groups 1, 2 and 3 had 9.93%, 12.64% and 7.53% greater milk yield than control group(P<0.05); SP could significantly increase milk fat percentage and milk protein percentage(P<0.05), and significantly reduce milk somatic cell count(P<0.05), especially test group 2. 3) Compared with control group, total nitrogen excretion in test groups was significantly reduced(P<0.05), and was reduced by 13.31%, 15.01% and 9.43% 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 supplement level of SP is 100 g/(d·head) in dairy cows under the condition in the present study.

Key words： small peptides; microbial protein; milk performance; nitrogen excretion

Cite this article

WU Dandan , TENG Lebang , LUAN Zhengqing , SUN Guoqiang . Effects of Small Peptides on Ruminal Microbial Protein Production, Milk Performance and Nitrogen Excretion of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2016 , 28(4) : 1090 -1098 . DOI: 10.3969/j.issn.1006-267x.2016.04.017

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