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


     

Journal of Dairy Science Vol. 42 No. 2 327-332
© 1959 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 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 Lennon, H. D.
Right arrow Articles by Mixner, J. P.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Lennon, H. D., Jr.
Right arrow Articles by Mixner, J. P.

Relationships between Plasma Protein-Bound Iodine and Certain Measures of Reproductive and Lactational Performance in Dairy Cattle1

H. D. Lennon, Jr.2 and J. P. Mixner

Department of Dairy Industry, New Jersey Agricultural Experiment Station, Sussex

ABSTRACT

Plasma protein-bound iodine values (PBI) were determined at 60 days postpartum on 93 Holstein cows (139 lactations) and 34 Guernsey cows (57 lactations) over a 3-yr. period. This measure was correlated on "among lactations" and "among cows in lactation" bases, with certain concurrent measures of reproductive and lactational performance. Measures of reproductive performance included interval from parturition to conception, interval from parturition to first estrus, interval from first breeding to conception, and number of services per conception. Measures of lactational performance included 240-day 4% FCM production, maximum initial 4% FCM yield, persistency index, fat percentage, and solids-not-fat percentage.

The Holstein data on "among lactations" basis gave significant coefficients of correlation between PBI and interval from first breeding to conception (-0.67*) and services per conception (-0.69*). On an "among cows in lactation" basis, the Holstein data also gave significant coefficients of correlation between PBI and interval from parturition to conception (-0.23**), interval from first breeding to conception (-0.25**), services per conception (-0.21*), and fat per cent (-0.18*). No other coefficients of correlation in either breed reached the level of statistical significance.

FOOTNOTES

1 This research was supported in part by Research and Marketing Funds (Sec. 10b) of the Agricultural Research Service, Animal Husbandry Research Branch, U. S. Department of Agriculture, and was part of a Northeast Regional Project (NE-30, The Relation of Certain Physiological Factors to the Productive Capacity of Dairy Cattle), a cooperative study involving agricultural experiment stations in the Northeastern Region of the United States and supported in part by regional funds of the U. S. Department of Agriculture.

2 Present address: Armour and Company, Research Division, 1425 West 42nd Street, Chicago 9, Illinois.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1959 by the American Dairy Science Association ®.