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Nongenetic Factors Affecting the Production of Nonfat Milk Solids by the Bovine¹

Laboratory of Biochemistry, Department of Dairy Science, University of Illinois, Urbana

ABSTRACT

Factors that affect the composition and total production of milk by the bovine include: breed, individuality, nutrition, locality, bioclimatological effects, management, stage of lactation, and physiological factors (age, exercise, estrus, gestation, yield, sickness, etc.). Many of these factors are inter-related and for some the effect may be small, except under exceptional conditions. The major factors affecting the production of nonfat milk solids on which there has been considerable work are breed, individuality, nutrition, bioclimatological effects, and stage of lactation. Breed and individuality are more properly thought of as genetic factors. An attempt will be made here to review briefly some of the knowledge pertaining to bioclimatological and nutritional effects; then to conclude with some studies concerning protein production and the stage of lactation.

It is important to consider, however, some concepts regarding the nonfat solids of milk.

¹ Presented at 52nd Animal Meeting of the American Dairy Science Association, Oklahoma State University, Stillwater.