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Intrauterine Development of the Bovine Fetus in Relation to Milk Yield in Guernsey Cattle¹

Maine Agricultural Experiment Station, Orono, Maine

ABSTRACT

This paper presents a study of advanced registry Guernsey records to determine the effect of carrying the calf on the milk yield of the mother during that pregnancy. The data show that the carrying of the calf is slight but significant drain on the mother's milk producing capacity amounting to from 400 to 600 pounds of milk with an energy value of about 125 to 200 therms. The carrying of the fetus has no influence on the butter-fat percentage.

¹ Papers from the Biological Laboratory of the Maine Agricultural Experiment Station, No. 156. The Rockefeller Institute for Medical Research has furnished material aid to these animal husbandry investigations in the form of a grant for increased maintenance of the work. This paper presents one phase of these researches as conducted by the Biological Laboratory of the Maine Agricultural Experiment Station.