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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0926    [Accepted] Published online May 12, 2020.
The effect of seasonal thermal stress on milk production and milk compositions of Korean Holstein and Jersey cows
Dong-Hyun Lim1  , Vijayakumar Mayakrishnan1  , Kwang-Seok Ki1  , Young-Hoon Kim2,*  , Tae Il Kim1,* 
1Dairy Science Division, National Institute of Animal Science, Rural Development Administration, Cheonan 31000, Korea
2Department of Agricultural Biotechnology, Center for Food and Bioconvergence, and Research Institute of Agriculture and Life Science, Seoul National University, Seoul 08826, Korea
Correspondence:  Young-Hoon Kim,Email: ykeys2584@snu.ac.kr
Tae Il Kim,Email: kimti@korea.kr
Received: 4 December 2019   • Revised: 4 February 2020   • Accepted: 9 May 2020
In this study we investigated the effect of seasonal thermal stress on milk production and milk compositions between Holstein and Jersey dairy cows under the temperate-climate in Korea.
A total of 9 Holstein lactating dairy cows (2.0 ± 0.11 parity) which had a daily milk yield of 29.77 ± 0.45 kg, and days in milk of 111.2 ± 10.29 were selected similarly at the beginning of the experiments in each season. Also, a total of 9 Jersey lactating dairy cows (1.7 ± 0.12 parity) which had a daily milk yield of 20.01 ± 0.43 kg, and days in milk of 114.0 ± 9.74 were selected similarly at the beginning of the experiments.
Results showed that the average ambient temperature (Ta, °C) and temperature-humidity index (THI) were higher in summer, and were lower in winter (p<0.05). The average relative humidity (RH, %) was higher in autumn than that of other seasons (p<0.05). Milk production was significantly decreased (Holstein 29.02 kg/d and Jersey 19.75 kg/d) in autumn than in other seasons (Holstein 30.14 kg/d and Jersey 20.96 kg/d). However, the milk production was negatively correlated in Holstein cows, and positively correlated in Jersey cows with THI values increased from 16 to 80. In addition, milk yield was increased by 15% in Holstein cows and decreased by 11% in Jersey cows with the THI values increased from 16 to 20. The fat and protein content percentage was significantly higher in Jersey milk than in Holstein milk, furthermore the fat and protein content yield was higher in Jersey cow milk than that of Holstein cow’s milk with all THIs.
From the study results, we concluded that Jersey cows might be less adaptable to low temperature of the winter, and this would have a negative impact on dairy farmer income since Korea’s milk price estimation system places a higher value on milk yield than on milk compositions or sanitary grades.
Keywords: Milk Production; Season; Temperature-humidity Index; Milk Composition

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