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Seasonal Effect on Yield of Dairy Cows¹

Iowa State College, Ames, Iowa

ABSTRACT

A study of nearly 68,000 Iowa Cow Testing Associations yearly records shows that the group which freshened in the month of November had the highest average yield. From November to June the group freshening in each month produced less than the group freshening the preceding month. Prom June until November the group freshening in each month had a larger production than the group of the preceding month. Although June showed the smallest average yield of milk, its butterfat yield was the same as that of the May and July groups.

Factors were calculated from these averages based on the mean yield of all the records. These factors can be used in correcting yields where the cows started in different months so as to reduce them to a common standard.

¹ Journal Paper No. B45 of the Iowa Agricultural Experiment Station.