Effects of Supplemental Levels of Cysteamine and Yeast Culture on Milk Performance and Nitrogen Excretion of Dairy Cows

WANG Ling; LIU Kaidong; LYU Yongyan; SUN Guoqiang

doi:10.3969/j.issn.1006-267x.2015.09.021

Chinese Journal of Animal Nutrition >

2015 , Vol. 27 >Issue 9: 2832 - 2840

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.09.021

Feed Science and Technology

Effects of Supplemental Levels of Cysteamine and Yeast Culture on Milk Performance and Nitrogen Excretion of Dairy Cows

WANG Ling ,
LIU Kaidong ,
LYU Yongyan ,
SUN Guoqiang

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1. College of Animal Science and Technology, Qingdao Agricultural University, Qingdao 266109, China;
2. Institute of Animal Husbandry and Veterinary Medicine of Qingdao, Qingdao 266100, China

Received date: 2015-04-24

Online published: 2015-09-12

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Abstract

This experiment was conducted to determine the effects of supplemental levels of cysteamine (CS) and yeast culture (YC) on milk performance and nitrogen excretion of dairy cows. Forty Holstein lactating cows with similar age, body weight, milk yield and lactation stage [(135±15) days in milk] were divided into 10 groups, group C was fed a basal diet, experimental groups were jointly supplemented with CS and YC at different levels. The supplemental levels of CS were designed as 17.5 (L), 20.0 (M), 22.5 g/(d·cow) (H). The supplemental levels of YC were designed as 90 (L), 100 (M), 110 g/(d·cow) (H). The experimental groups were LL, ML, HL, LM, MM, HM, LH, MH and HH groups, and each group had 4 replicates with 1 cow per replicate. The pretest lasted for 15 days, and the test lasted for 60 days. The results showed as follows: 1) cows in test groups had greater milk yield than those in group C, specially in group HM, and the difference between groups HM and C was significant (P<0.01); 2) cows in test groups had greater milk fat percentage and milk protein percentage, but had lower milk somatic cell count, specially in group HM, and the differences between groups HM and C were significant (P<0.01); 3) compared with group C, dietary nitrogen conversion efficiency of lactation in test groups was increased, specially in group HM, and the difference between groups HM and C was significant (P<0.01), and total nitrogen excretion in groups LL, ML, HL, LM, MM, HM, LH, MH and HH was reduced by 5.23%, 8.50%, 12.36%, 21.92%, 24.34%, 27.25%, 16.31%, 18.10% and 20.43%, respectively, and the difference between groups HM and C was significant (P<0.01). The experimental results indicate that the supplementation of CS and YC in dairy cow diets can greater milk yield, improve milk quality, improve dietary nitrogen conversion efficiency of lactation, and reduce nitrogen excretion; the optimal combination supplemental levels of CS and YC are 22.5 and 100 g/(d·cow) under the condition in the present study.

Key words： cysteamine; yeast culture; milk performance; nitrogen excretion

Cite this article

WANG Ling , LIU Kaidong , LYU Yongyan , SUN Guoqiang . Effects of Supplemental Levels of Cysteamine and Yeast Culture on Milk Performance and Nitrogen Excretion of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2015 , 27(9) : 2832 -2840 . DOI: 10.3969/j.issn.1006-267x.2015.09.021

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