Effects of environmental management on seasonal ...
|Title||Effects of environmental management on seasonal decrease in milk production in dairy cattle|
|Author(s)||J. A. Thompson, M. Brimacombe, J. A. Calvin, M. A. Tomaszewski, T. Jeffery Davidson, D. D. Magee|
|Journal||Journal of the American Veterinary Medical Association|
|Abstract||Owners of 141 dairy herds who used the Dairy Herd Improvement Association's database for keeping production and reproduction records were interviewed to describe the location of fans, shade structures, and sprinklers on their farms. Production and reproduction data were retrieved from the database, and a mixed model ANOVA was used to estimate effects of season, parity and use of sprinklers and fans on milk production. Daily peak milk production decreased for all parity groups in the summer, but the effect decreased with increasing days in lactation. Use of sprinklers increased peak milk production in parity-1 and -3 or higher cows, but use of fans did not significantly alter effects of season. After calving in the summer, 305-day milk production decreased in parity-2 and -3 cows. This decrease was not significantly modified by the presence of sprinklers or fans. It is concluded that use of sprinklers may increase peak milk production in high-producing cows and could be recommended for reducing heat and total stress during this time. It is suggested that management of parity-2 or higher cows so that they calve from October to June could increase 305-day milk production..|
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