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


     

Journal of Dairy Science Vol. 75 No. 1 257-261
© 1992 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 HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Meinert, R. A.
Right arrow Articles by Varga, G. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Meinert, R. A.
Right arrow Articles by Varga, G. A.

Effect of Monensin on Growth, Reproductive Performance, and Estimated Body Composition in Holstein Heifers

R. A. Meinert 1, C.-M.J. Yang 1, A. J. Heinrichs 1, and G. A. Varga 1

1 Department of Dairy and Animal Science, The Pennsylvania State University, University Park 16802

The objective was to determine the effect of feeding monensin on growth performance, average age at breeding, and body composition of Holstein heifers. Forty heifers were divided by weight into two groups, averaging 330 kg (heavy) and 217 kg (light) at the begenning of the trial. Within each weight group, heifers were assigned randomly to either of two treatments: without or with monensin feeding (200 mg per head daily). All heifers were fed diets containing either corn silage at 2% BW or ad libitum grass pasture supplemented with concentrates (1 to 1.5 kg per head daily). Monensin had no effect on BW, average daily gain, height at withers, heart girth, length, coccae width, or body condition score, Feeding monensin significantly decreased the age at breeding by 15 and 24 d and age at calving by 36 and 61 d for heavy and light heifers, respectively. Estimated empty body water, protein, or fat percentages determined by urea space were not affected by monensin. Heavy heifers contained a smaller percentage of empty body water but higher percentages of empty body protein and fat than light ones. The results from this study indicate that monensin can reduce age at puberty in Holstein heifers without affecting BW and composition.

Key Words: monensin • heifers • body composition • growth

Submitted on April 11, 1991
Accepted on July 18, 1991




This article has been cited by other articles:


Home page
 J DAIRY SCIHome page
S. K. Tallam, T. F. Duffield, K. E. Leslie, R. Bagg, P. Dick, G. Vessie, and J. S. Walton
Ovarian Follicular Activity in Lactating Holstein Cows Supplemented with Monensin
J Dairy Sci, November 1, 2003; 86(11): 3498 - 3507.
[Abstract] [Full Text] [PDF]

Home page
 J DAIRY SCIHome page
M. T. Gabler and A. J. Heinrichs
Dietary Protein to Metabolizable Energy Ratios on Feed Efficiency and Structural Growth of Prepubertal Holstein Heifers
J Dairy Sci, January 1, 2003; 86(1): 268 - 274.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1992 by the American Dairy Science Association ®.