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The Effect of Season of the Year and Advancing Lactation upon Milk Yield of Jersey Cows

Department of Animal Husbandry, Florida Agricultural Experiment Station, Gainesville, Florida

ABSTRACT

The relatively uniform environment of Florida was not conducive to significant differences in yearly milk production between groups of Jersey cows calving during the different seasons of the year.

Advancing stage of lactation, irrespective of season of the year, produced a relatively uniform rate of decline in monthly milk yield from the second through the seventh month in milk. The progressively greater rate of decline after the seventh month is associated with the inhibiting factor of advancing gestation.

The seasonal influence on milk yield, irrespective of advancing lactation, resulted in maximum rate of milk production during June, and the minimum during November and December The peak of milk production was attained in advance of the mean maximum temperature early in the summer rainy season.