Body Pattern as Related to Mammary Gland Secretion

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Abstract
This paper presents a study of the relation of body size to milk yield and butter fat percentage in Jersey cattle. 6000 cows were measured for 8 body parts, weight, height at withers, depth at withers, heart girth, paunch girth, width at hips, body length and rump length. Milk productions, butter fat percentages, age and parentages were known. The data show the age of the cow, her weight, and her heart girth are in the order named of significance to milk secretion. The other 6 measurements of body pattern have insignificant effects. Quantitatively all correlations are rather small, their significance being comparable to the relation which exists between the milk yields of half-sisters or single cousins. The significance of these facts to the problems of conformation and milk secretion are discussed.

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