Correlation Analysis Between Milk Fat to Protein Ratio, Milk Urea Nitrogen Content and Reproductive Performance in Cows

LIAO Xiangxiang; CHEN Dan; ZHANG Meirong; CAI Zhiyong; YANG Zhangping; YANG Liguo; LIU Kun; CHEN Liang; MAO Yongjiang

doi:10.3969/j.issn.1006-267x.2014.03.016

Chinese Journal of Animal Nutrition >

2014 , Vol. 26 >Issue 3: 667 - 674

DOI: https://doi.org/10.3969/j.issn.1006-267x.2014.03.016

Ruminant Nutrition

Correlation Analysis Between Milk Fat to Protein Ratio, Milk Urea Nitrogen Content and Reproductive Performance in Cows

LIAO Xiangxiang ,
CHEN Dan ,
ZHANG Meirong ,
CAI Zhiyong ,
YANG Zhangping ,
YANG Liguo ,
LIU Kun ,
CHEN Liang ,
MAO Yongjiang

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1. Animal Science and Technology College, Yangzhou University, Yangzhou 225009, China;
2. Education Ministry's Key Laboratory in Agricultural Animal Genetics, Breeding and Reproduction, Huazhong Agricultural University, Wuhan 430070, China;
3. Haifeng Dairy Cattle Farm, Shanghai Dairy Group, Dafeng 224100, China

Received date: 2013-09-17

Online published: 2014-03-04

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Abstract

To explore the effects of milk fat to protein ratio (FPR) and milk urea nitrogen (MUN) content in 7 days before service of cows on reproductive performance, a total of 1 460 of the first lactation Holstein cows which calving in the close periods were chosen. The milk samples were collected in 7 days before service, and the daily milk yield, milk composition and MUN content were detected for the selected cows. At the same time, the reproductive performance (days in milk for the first service, number of service, pregnant rate, and days in milk for pregnancy) of these cows were detected. The effects of FPR and MUN content on the reproductive performance were analyzed using multivariate analysis of variance, Logistic regression analysis, correlation and regression analysis. The results showed as follows: the FPR and MUN content in 7 days before service were (1.35±0.28) and (10.61±2.68) mg/dL, respectively. The FPR had a significant effect on days in milk for the first service (P<0.01), but had no significant effect on the other reproductive performance indexes (P>0.05). The MUN content had significant effects on days in milk for the first service (P<0.01), number of service and pregnant rate (P<0.05), but had no significant effect on days in milk for pregnancy (P>0.05). The significantly negative correlationships between FPR and days in milk for the first service and days in milk for pregnancy were observed (P<0.01). There were significantly positive correlations between MUN content and days in milk for the first service and pregnant rate (P<0.01). The MUN content had significant effects on pregnant or not in the first or the first two estrous cycles (P<0.05). The MUN content in 7 days before service for the first lactation Holstein cows has significant effects on number of service and days in milk for the first service, and it can be used as one of the methods in the prediction and management of dairy cattle reproductive performance.

Key words： MUN; FPR; cows; reproductive performance

Cite this article

LIAO Xiangxiang , CHEN Dan , ZHANG Meirong , CAI Zhiyong , YANG Zhangping , YANG Liguo , LIU Kun , CHEN Liang , MAO Yongjiang . Correlation Analysis Between Milk Fat to Protein Ratio, Milk Urea Nitrogen Content and Reproductive Performance in Cows[J]. Chinese Journal of Animal Nutrition, 2014 , 26(3) : 667 -674 . DOI: 10.3969/j.issn.1006-267x.2014.03.016

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