Natural tree shade increases milk stability of lactating dairy cows during the summer in the subtropics

This research communication addresses the hypothesis that, during the summer in the subtropics, natural tree shade helps to improve milk functional characteristics such as stability and acidity. Sixteen Holstein lactating cows were enrolled. The study consisted of three periods (pre-stress, heat str...

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Bibliographic Details
Published in:Journal of dairy research 2020-11, Vol.87 (4), p.444-447
Main Authors: Abreu, Alexandre S., Fischer, Vivian, Stumpf, Marcelo T., McManus, Concepta M., González, Felix H. D., da Silva, Jéssica B. S., Heisler, Guilherme
Format: Article
Language:English
Subjects:
Acidity
Animal lactation
Animals
Coagulation
Dairy cattle
Ethanol
Heat
Heat stress
Heat tolerance
Humidity
Lactose
Milk
Proteins
Shade
Stability
Summer
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Summary:This research communication addresses the hypothesis that, during the summer in the subtropics, natural tree shade helps to improve milk functional characteristics such as stability and acidity. Sixteen Holstein lactating cows were enrolled. The study consisted of three periods (pre-stress, heat stress and post-stress) based on allocating grazing cows into two treatments (with and without access to shade during the Heat Stress period). Overall THI during the trial was (mean ± se) 76.0 ± 3.4. Access to shade prevented the heat stress-related decrease in milk stability both in the ethanol and in the coagulation time test, as well as maintained milk acidity within an acceptable range (14 to 18°D).
ISSN:0022-0299
1469-7629
DOI:10.1017/S0022029920000916