Journal article

Responses of dairy cows to short-term heat stress in controlled-climate chambers

JB Garner, M Douglas, SRO Williams, WJ Wales, LC Marett, K DiGiacomo, BJ Leury, BJ Hayes

ANIMAL PRODUCTION SCIENCE | CSIRO PUBLISHING | Published : 2017

Abstract

The objective of the present research was to describe the physiological and production responses of lactating dairy cows during and after sudden exposure to temperate-climate heat-wave conditions, compared with cows in thermoneutral conditions. Twelve lactating multiparous Holstein-Friesian dairy cows were housed in controlled-climate chambers for 4 days. Six were exposed to a short-term temperature and humidity challenge (THc, diurnal temperature and humidity fluctuations inducing moderate heat stress; temperature humidity index 74-84) and six cows were exposed to thermoneutral conditions (THn, temperatur humidity index 55-61). Cows were also measured during a 7-day pre-experimental and 14-..

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