Puberty and breeding performance of beef heifers developed at different rates of gain

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dc.contributor.author Minton, J. Ernest
dc.contributor.author Brandt, Robert T., Jr.
dc.contributor.author Coughlin, C.M.
dc.contributor.author Cochran, R.C.
dc.date.accessioned 2010-09-17T20:56:49Z
dc.date.available 2010-09-17T20:56:49Z
dc.date.issued 2010-09-17T20:56:49Z
dc.identifier.uri http://hdl.handle.net/2097/4982
dc.description.abstract Crossbred heifers (546 lb initial body weight) were developed in drylot and limit-fed a corn, corn silage diet to gain .5 (n = 14), 1.0 (n = 15), 1.5 (n = 14), or 2.0 lb/d (n = 15) from Dec. 7, 1992 until the onset of the breeding season, May 3, 1993. Actual daily gains averaged 1.0, 1.4, 1.8, and 2.1 lb/d, respectively. Age at puberty was not affected by feeding treatment. At the onset of the breeding season, nutritional treatment had a linear effect on body condition score, ribeye fat thickness (both P<.01), and reproductive tract score (P<.05), all increasing with increasing rate of gain. Nutritional treatment had a quadratic effect on pelvic area (P<.05), which averaged 190.6, 201.6, 206.5, and 205.3 cm2 for heifers fed to gain .5, 1.0, 1.5, and 2.0 lb/d, respectively. At the conclusion of the development period, estrus was synchronized, and heifers were inseminated artificially at estrus for 45 days and, if open, mated naturally for another 17 d. Overall pregnancy rates were similar among heifers fed to gain .5, 1.0, and 1.5 lb/d (92.9, 93.3, and 92.9%, respectively), and all tended to be greater (P<.09) than the rate for heifers fed to gain 2.0 lb/d (66.7%). In summary, NRC recommendations underestimated gain of limit-fed heifers at lower predicted rates of gain. Thus, even though heifers fed to gain only .5 lb/d had lower body condition scores and reproductive tract scores at the onset of the breeding season, their actual body weight gains (1.0 lb/d) were sufficient for normal onset of puberty and subsequent conception. In addition, heifers fed to achieve relatively high rates of gain (2.0 lb/d) during development may have had impaired fertility. en_US
dc.publisher Kansas State University. Agricultural Experiment Station and Cooperative Extension Service en_US
dc.relation.isPartOf Cattlemen’s Day, 1994 en_US
dc.relation.isPartOf Kansas Agricultural Experiment Station contribution; no. 94-373-S en_US
dc.relation.isPartOf Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 704 en_US
dc.subject Beef en_US
dc.subject Beef heifers en_US
dc.subject Puberty en_US
dc.subject Heifer development en_US
dc.title Puberty and breeding performance of beef heifers developed at different rates of gain en_US
dc.type Conference paper en_US
dc.date.published 1994 en_US
dc.citation.epage 103 en_US
dc.citation.spage 101 en_US
dc.description.conference Cattlemen's Day, 1994, Kansas State University, Manhattan, KS, March 4, 1994 en_US
dc.contributor.authoreid eminton en_US
dc.contributor.ORCID orcid.org/0000-0002-9150-169X


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