Thermal comfort and productive responses of 7/8 holstein-gyr cows subjected to cooling system

Q3 Agricultural and Biological Sciences
Marcos Vinícius da Silva, Gledson Luiz Pontes de Almeida, Héliton Pandorfi, Alex Souza Moraes, Gleidiana Amélia Pontes de Almeida Macêdo, Maria Eduarda Gonçalves de Oliveira, Maria Vitória Neves de Melo, Taize Calvacante Santana
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引用次数: 0

Abstract

The objective of this research was to identify the influence of the evaporative adiabatic cooling system (EACS) on the thermal comfort and productive responses of dairy cattle, through multivariate analysis by principal components (PC), in the summer and winter seasons of the semiarid region of Pernambuco, Brazil. The data came from an experiment that included 16 multiparous lactating cows (7/8 Holstein-Gyr), randomly distributed in 4 sets, with 4 experimental phases and 4 treatments (0, 10, 20, and 30 min.). The multivariate analysis was carried out through PC for the thermal comfort indices, physiological variables, and milk production and composition. The highest milk production in the summer season was obtained for animals exposed to the cooling system for 30 min. In the winter season in the morning period, the use of the EACS for 10 min. was sufficient for improvements in milk production. The times of exposure to EACS caused changes in the composition of milk, for both seasons. Principal component analysis made it possible to verify a positive correlation of evaporative cooling with thermal comfort, physiological responses, and production and composition of milk of lactating cows.
冷却系统对7/8头荷斯坦奶牛热舒适和生产反应的影响
本研究的目的是通过主成分(PC)多元分析,确定蒸发绝热冷却系统(EACS)对巴西伯南布哥半干旱地区夏季和冬季奶牛热舒适和生产反应的影响。试验数据来自于16头产乳奶牛(7/8头荷斯坦-盖尔),随机分为4组,4个试验阶段,4个处理(0、10、20和30 min)。通过PC对热舒适指标、生理指标、产奶量和产奶量进行多变量分析。在夏季,暴露于冷却系统30分钟的奶牛产奶量最高。在冬季早晨,使用EACS 10分钟足以提高产奶量。暴露于EACS的次数导致了两个季节牛奶成分的变化。主成分分析可以验证蒸发冷却与热舒适、生理反应、泌乳奶牛产奶量和成分的正相关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Scientiarum. Animal Sciences
Acta Scientiarum. Animal Sciences Agricultural and Biological Sciences-Food Science
CiteScore
1.60
自引率
0.00%
发文量
45
审稿时长
9 weeks
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