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Biology of Reproduction, Vol 9, 538-543, Copyright © 1973 by Society for the Study of Reproduction

Growth of the Mammary Gland During Pregnancy and Lactation in the Rabbit

MING-HSIUNG LU 1, and R. R. ANDERSON 1

1 Department of Dairy Husbandry, University of Missouri, Columbia, Missouri 65201


Mammary glands were removed from groups of 5 rabbits each including: normal males, virgin females, Day 16 of pseudopregnancy, Days 16, 26 and 32 of pregnancy, Days 1, 2, 5, 10, 15 and 20 of lactation, and Day 5 of involution. Measurements of mammary glands included wet weight, dry fat-free weight, DNA content, and RNA content. Results indicated that during pregnancy, 75% of mammary growth occurred between Days 16 and 26. Most growth during lactation occurred between Days 5 and 15. Approximately two-thirds of total mammary growth took place during pregnancy and one-third during lactation. A decrease in all parameters of mammary growth occurred within 5 days of involution which followed a 20-day period of lactation and at a rate as rapid as reported in mice and rats.

Accepted on June 12, 1973






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Copyright © 1973 by the Society for the Study of Reproduction.