Correlation Analysis on Milk Yield, Milk Composition and Temperature Humidity Index of Dairy Cows with Different Milk Yield

TONG Jinjin; ZHANG Hua; WU Fuxin; NIU Hui; XIONG Benhai; JIANG Linshu

doi:10.3969/j.issn.1006-267x.2020.07.027

2020 , Vol. 32 >Issue 7: 3171 - 3180

DOI: https://doi.org/10.3969/j.issn.1006-267x.2020.07.027

Correlation Analysis on Milk Yield, Milk Composition and Temperature Humidity Index of Dairy Cows with Different Milk Yield

TONG Jinjin ,
ZHANG Hua ,
WU Fuxin ,
NIU Hui ,
XIONG Benhai ,
JIANG Linshu

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1. Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China;
2. Beijing Institute of Animal Science and Veterinary Medicine, Chinese Academy of Agricultural Sciences, Beijing 100193, China

Received date: 2020-01-09

Online published: 2020-07-15

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Abstract

The objective of this study was to investigate the correlation of milk yield, milk composition and temperature humidity index (THI) of dairy cows with different milk yield in Beijing under natural heat stress condition. A total of 60 Holstein cows with similar parity, body weight[(610.00±22.13) kg], lactation days[(157.00±1.27) d] and milk yield[(33.39±4.61) kg/d] were selected. According to the milk yield, the cows were divided into high yield group[(42.47±3.73) kg/d], middle yield group[(34.10±3.20) kg/d] and low yield group[(28.28±4.19) kg/d] with 20 cows per group. The trial was conducted in a dairy farm at Yanqing district from 2019-06-20 to 2019-09-30 when the average THI was above 72. In detail, 2019-06-23 to 2019-07-22, 2019-07-23 to 2019-07-29 and 2019-07-30 to 2019-09-09 corresponded to early, middle and late heat stress stages, respectively. Origin 9.0 software was used to analysis the Pearson correlation, regression relationships and ANOVA among milk yield, THI and milk components. The results showed that in the heat stress period, the milk yield and milk components (except lactose rate) had significant difference among high, middle and low yield groups (P<0.01). With the lengthening heat stress time, the milk yield in high and middle yield groups was reduced significantly (P<0.01). In the middle heat stress stages, milk fat rate in high and middle yield groups was significantly lower than that in the early heat stress stages (P<0.01), and milk protein rate had no significant change (P>0.05); in the late heat stress stages, compared with the early heat stress period, the milk protein rate in each group was significantly decreased (P<0.01), the ratio of milk fat rate to milk protein rate was extremely significantly increased in middle and low yield groups (P<0.01), and the milk fat rate in low yield group was significantly increased (P<0.01). Pearson correlation analysis showed that milk yield was negatively correlated with DIM, milk fat rate and the ratio of milk fat rate to milk protein rate (P<0.05), and positively correlated with THI, milk protein rate and lactose rate (P<0.05). There was a significant negative correlation between THI and milk fat rate and milk protein rate in heat stress stages (P<0.01). In summary, there is a significant negative correlation between the milk yield and the THI, and the milk protein rate and milk fat rate decreas significantly. Compared with the cows in the middle and low yield groups, the changes in milk yield and milk composition in the high yield group are more sensitive to the heat stress.

Key words： dairy cows; milk yield; THI; partial correlation analysis; regression analysis

Cite this article

TONG Jinjin , ZHANG Hua , WU Fuxin , NIU Hui , XIONG Benhai , JIANG Linshu . Correlation Analysis on Milk Yield, Milk Composition and Temperature Humidity Index of Dairy Cows with Different Milk Yield[J]. Chinese Journal of Animal Nutrition, 2020 , 32(7) : 3171 -3180 . DOI: 10.3969/j.issn.1006-267x.2020.07.027

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