Effect of low winter temperatures on milk production of dairy cows grazed on farms in a warm temperate climate (Australia)
Two-day milk production figures for dairymen at Armidale (31° S Lat.) and Goulburn (35° S Lat.), Australia, were compared with minimum daily temperatures. Comparisons were made between production levels on days with temperatures above and below 0°C, and between days with varying intensities of cold: differences in production were minor. The infrequent, more prolonged periods of cold weather (“cold” being days on which the minimum temperature was below 0°C) were also associated with only very slight reductions in milk output; and the most pronounced decline in production was not attributable to low temperatures. Although short-term fluctuations in output were not related to low temperature events or low temperatures in combination with rain, thermal stress on plant growth during winter contributed to a seasonal downturn in production and below-average annual milk yields in areas with low winter temperatures.
KeywordsThermal Stress Minimum Temperature Milk Production Production Level Daily Temperature
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- AUSTRALIA, BUREAU OF METEOROLOGY (1975): Climatic Averages, Australia. Australian Government Publishing Service, Canberra, 76.Google Scholar
- FITZPATRICK, E. A. and NIX, H. A. (1970): The climatic factor in Australian grassland ecology. In: Australian Grasslands. R. M. Moore (ed.), Australian National University Press, Canberra, 3–26.Google Scholar
- McMASTER, G. S. and WALKER, M. H. (1970): A brief history of lucerne and its present distribution in New South Wales. Agric. Gaz. New South Wales, 81: 24–27.Google Scholar
- MINSON, D. J. and McLEOD, M. N. (1970): The digestibility of temperate and tropical grasses. In: Proc. XI Int. Grasslands Congress, M. J. T. Norman (ed.), University of Queensland Press, St. Lucia (Queensland, Australia), 719–722.Google Scholar
- NEW SOUTH WALES DEPARTMENT OF AGRICULTURE (1975): Recording of Pure Bred Registered Dairy Cattle in New South Wales 1973–74 (No. 39). New South Wales Government Printer, Sydney.Google Scholar
- WILLIAMS, C. M. (1967): Livestock production in cold climates. In: Ground Level Climatology. R. H. Shaw (ed.), Amer. Ass. Adv. Sci. Pub. 86: 221–231.Google Scholar
- WRIGHT, W. A. (1970): A comparison of rye grasses for the South Coast area. Agric. Gaz. New South Wales, 81: 438–440.Google Scholar