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Influence of high temperatures on milk production of friesian dairy cows grazed on farms in a pasture based feed system

Influence of high temperatures on milk production of friesian dairy cows grazed on farms in a pasture based feed system

International Journal of Biometeorology 22(4): 279-284

Daily milk production figures for 3 dairy farms having some irrigated feed and located in a semi-arid climate in New South Wales, Australia, were collected from 2 yr. The possible short-term effects of high temperatures on production were examined by aggregating data for the 3 farms and comparing production on hot days (maximum temperatures above 27.degree. C) with that on other days. No statistically significant differences were observed between production on hot days and other days, or between production on days having varying heat intensities above the 27.degree. C threshold. Neither prolonged periods of high temperatures nor the rapid onset of hot weather resulted in consistent declines in farm production. Even though the farm data used were affected by uncontrolled variables, the temperature conditions examined did not constitute the dominant factor affecting short-term production fluctuations. Feed of adequate quality and quantity, and acclimatization of cows to temperatures that were often not greatly above the 27.degree. C threshold, probably contributed to the lack of a significant decline in production in association with high temperatures.

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Accession: 005685853

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PMID: 750508

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