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

Published online by Cambridge University Press:  30 October 2020

Alexandre S. Abreu ,
Vivian Fischer ,
Marcelo T. Stumpf ,
Concepta M. McManus ,
Felix H. D. González ,
Jéssica B. S. da Silva  and
Guilherme Heisler
Alexandre S. Abreu
Affiliation:
Milk and Beef Consultant in Agribusiness, Brazil
Vivian Fischer*
Affiliation:
Animal Science Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
Marcelo T. Stumpf
Affiliation:
Agroecology Faculty, Federal University of Rio Grande, Rio Grande, Estrela, Brazil
Concepta M. McManus
Affiliation:
Physiology Science, Federal University of Brasília, Brasília, Brazil
Felix H. D. González
Affiliation:
Clinical Pathology Department, Veterinary Medicine Faculty, Federal University of Rio Grande do Sul, Brazil
Jéssica B. S. da Silva
Affiliation:
Milk and Beef Consultant in Agribusiness, Brazil
Guilherme Heisler
Affiliation:
Animal Science Department, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
*
Author for correspondence: Vivian Fischer, Email: vivinha.fischer@hotmail.com
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Abstract

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).

Keywords

Holstein cowshot seasonmilk aciditymilk stabilityshading
Type
Research Article
Information
Journal of Dairy Research , Volume 87 , Issue 4 , November 2020 , pp. 444 - 447
Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation.

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