| Preweaning growth traits for Senepol, Hereford, and reciprocal crossbred calves and feedlot performance and carcass characteristics of steers. | |
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MedLine Citation:
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PMID: 9928599 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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We conducted a multiyear study in two phases to determine preweaning performance traits of Senepol (S x S), Hereford (H x H), and reciprocal (S x H and H x S) F1 crossbred calves and feedlot performance and carcass characteristics of steers. In Phase I, from 1985 to 1989, data from S x S (n = 194), H x H (n = 383), and S x H (n = 120) calves were used. Numbers of S x S cows were increased during Phase I so that data from H x S (n = 74) calves could be included in Phase II (1990 to 1992) in addition to S x S (n = 118), H x H (n = 130), and S x H (n = 56) calves. Also during Phase II, feedlot performance and carcass characteristics were determined for S x S (n = 30), H x H (n = 26), H x S (n = 36), and S x H (n = 26) steers. In Phase I, S x S calves had heavier (P < .01) birth weights and heavier (P < .01) 205-d adjusted weaning weights than H x H calves. Birth weights of S x H calves were heavier (P < .01) than the mean of the purebred calves, but 205-d adjusted weaning weights did not differ (P > .10). In phase II, direct heterosis was 3.5% for birth weight (P < .05) and 5.1% for 205-d adjusted weaning weight (P < .01). Senepol maternal breed effects were 1.9 kg for birth weight (P < .10) and 37.9 kg for 205-d adjusted weaning weight (P < .01). Levels of direct heterosis, Senepol maternal breed effects, and Hereford direct breed effects were significant for most feedlot performance traits of steer calves that were fed to a common end point. Breeds did not differ (P > .10) for USDA yield and quality grades, and direct heterosis was not significant for Warner-Bratzler shear force. These results demonstrate significant levels of heterosis in preweaning performance between S x S and H x H calves and in feedlot performance of steers. Levels of heterosis were smaller and nonsignificant for most carcass traits including meat tenderness, which did not differ between S x S and H x H steers in this study. |
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Authors:
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C C Chase; T A Olson; A C Hammond; M A Menchaca; R L West; D D Johnson; W T Butts |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of animal science Volume: 76 ISSN: 0021-8812 ISO Abbreviation: J. Anim. Sci. Publication Date: 1998 Dec |
Date Detail:
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Created Date: 1999-07-20 Completed Date: 1999-07-20 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 2967-75 Citation Subset: IM |
Affiliation:
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Agricultural Research Service, USDA, Brooksville, FL 34601-4672, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Animals, Suckling / genetics, growth & development* Birth Weight Breeding Cattle / genetics, growth & development* Crosses, Genetic* Female Florida Hybrid Vigor* Male Meat / standards* Tropical Climate Virgin Islands of the United States Weaning Weight Gain |
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