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The Relationship of Mammary Development and Body Weight¹

Department of Dairy Husbandry, Pennsylvania State College

ABSTRACT

Nineteen calves of the Holstein and Guernsey breeds were used to determine the relationship of mammary development to body wight. A highly significant statistical relationship was found to exist between the development of the mammary secretive tissue and body weight of both the Holstein and Guernsey heifer calves at 3 months of age. Highly significant correlations also were found between mammary tissue development and gains in body weight from 8 days to 3 months of age of the heifer calves of both breeds.

The lengths of the secretive tissues of Guernsey calves were related significantly to body weight at 6 months of age; however, there was no correlation in this respect with the Holstein calves at this age. There was no significant correlation between the width of the mammary secretive tissue and body weight of either breed at 6 months of age. No significant correlation was found between the gains in body weight from 8 days to 6 months and mammary development of either breed.

¹ Authorized for publication on August 8, 1947, as Paper no. 1385 in the Journal Series of the Pennsylvania Agricultural Experiment Station.