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Lactation Studies. VIII. Relation of Percentage of Complementary Milk, among Other Factors, to Milk Production¹

Departments of Animal Science and of Genetics, University of Minnesota, St. Paul

ABSTRACT

Data collected on 62 cows of Holstein and Jersey breeding were analyzed to determine how well the inherent capacity of an animal to produce milk can be estimated from percentage of complementary milk and other variables related to production.

A multiple correlation of total production, with percentage of complementary milk, maximum production, and days to maximum production of 0.83, was found in the intrastation, intrabreed variation. Several other variables did not contribute significantly in explaining variation in total production between animals. A simple correlation of 0.69 was found between the predicted production based on maximum production, percentage of complementary milk, and days to maximum production, and actual production compared to a correlation of 0.72 between actual productions in two consecutive years. It is suggested that the prediction of total yield of milk in a lactation from data collected early in lactation may be valuable in culling animals in breeding programs on dairy farms.

¹ Scientific Journal Series Paper no. 4560. Minnesota Agricultural Experiment Station, St. Paul, Minnesota.

² Present address: Kimber Farms, Inc., P. O. Box 2008, Fremont, California.