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- Title
The linear relationship between the temperature and humidity index (THI) of the bam and the average daily milk yield (MY) of dairy cows.
- Authors
Chen, Y. J.; Lee, H. K.; Yeh, H. Y.; Chen, S. I.; Wang, H. S.; Lin, Y. T.
- Abstract
In this experiment, the milking cow barn of the Hsinchu branch of the Animal Production Laboratory was used as the test field. The bam was 37m long, 34 m wide and 15 m high, with an altitude of 109 m, and the permeability ratio in the field was 33.3%. The cattle herd was completely mixed with the diet. (TMR) feeding. There were two types of milking models for cows, traditional fishbone milking and robot milking, with an average ratio of 4: 1 (n=52). A total of 8 sets of temperature and humidity sensors were deployed on the main body of the cowshed along the 2.5 m high column on both sides of the central walkway. The THI values were converted at the frequency of 1 record per hour, and they were continuously stored in the SQL database, and discussed the linear trend of average THI and MY in 2019. The results showed that there was a linear relationship between THI and MY. As THI increases from 55.7 to 83.3, MY decreases from 23.2 ± 6.2 kg to 20.8 ± 5.1 kg, a difference of 2.4 kg. The two show y = - 0.0736x + 27.56 The linear trend (y: MY, x: THI), the coefficient of determination (R²) = 0.42, that was, for every unit increase in THI, the observed value MY decreases by 0.073 kg.
- Subjects
MILK yield; DAIRY barns; DAIRY cattle breeding; ANIMAL herds; MILKING
- Publication
Journal of the Chinese Society of Animal Science, 2021, Vol 50, p62
- ISSN
0253-9187
- Publication type
Article