JDS
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Journal of Dairy Science Vol. 64 No. 3 427-432
© 1981 by American Dairy Science Association ®
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Anderson, R. R.
Right arrow Articles by Salah, M. S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Anderson, R. R.
Right arrow Articles by Salah, M. S.

Mammary Growth Pattern in Goats during Pregnancy and Lactation1

R. R. Anderson, J. R. Harness, A. F. Snead and M. S. Salah

Department of Dairy Husbandry, University of Missouri, Columbia 65201

ABSTRACT

Nine groups of five dairy goats from four breeds, with each breed represented at least once in each group, were in our experiment to measure mammary gland growth. Groups were virgins, days 90 to 100 pregnancy, 5 days prepartum (145 days pregnancy), 1 or 2 days prepartum, and 1 or 2, 5, 10, 15, and 30 days in lactation. Virgins were 19 mo old while all others had one pregnancy and lactation prior to experiment. Indices of mammary growth included untrimmed and trimmed wet weights of udders, dried fat-free tissue weights, deoxyribonucleic acid and ribonucleic acid contents. Each index was in a regression equation best to describe the pattern of mammary growth. These included linear, quadratic, cubic, and exponential model Y = AebX in which Y was the index of mammary growth and X was the day of pregnancy. Total deoxyribonucleic acid was the best index of mammary growth with a correlation of .95 in the exponential model. The predictive equation for total deoxyribonucleic acid in milligram was Y = 167e.019Xon a daily basis, and the rate of growth on a monthly basis was .57. Mammary growth in goats continued into early lactation, peaking at day 5. Ribonucleic acid doubled on the day after parturition, which reflected the rapid increase in protein synthesis at this time.

FOOTNOTES

1 Contribution from the Missouri Agricultural Experiments Station, Journal Series No. 8434. Approved by the director.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1981 by the American Dairy Science Association ®.