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Restricted Feed Consumption and Its Effect on Mammary Gland Growth¹

Department of Dairy Husbandry, University of Missouri, Columbia

ABSTRACT

Individual feed consumption was determined in a group of ovariectomized rats. They were then divided into two groups, one restricted to 75% of their individual normal consumption and the other to 50% of normal. During a period of 19 days, the rats were injected with 2 µg EB plus 6 mg P to stimulate mammary gland growth, then sacrificed and DNA/100 g bw determined. In comparison with a group of 78 full-fed control rats, gland growth was depressed only 3.89%, a nonsignificant amount by 75% of their normal feed intake, and 17.84%, a reduction significant at the 1% level when restricted to 50% of their feed intake.

¹ Contribution from the Missouri Agricultural Experiment Station. Journal Series no. 2996 Approved by the Director. Aided in part by a grant from the U.S.P.H.S.