Breed effects and retained heterosis for growth, carcass, and meat traits in advanced generations of composite populations of beef cattle

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dc.contributor.author Gregory, K.E.
dc.contributor.author Cundiff, L.V.
dc.contributor.author Koch, R.M.
dc.contributor.author Koohmaraie, M.
dc.contributor.author Dikeman, Michael E.
dc.date.accessioned 2010-10-05T18:56:21Z
dc.date.available 2010-10-05T18:56:21Z
dc.date.issued 2010-10-05T18:56:21Z
dc.identifier.uri http://hdl.handle.net/2097/6259
dc.description.abstract Retained heterosis for growth, carcass, and meat traits was estimated in F3 generation steer progeny in three composite populations finished on two levels of dietary energy density (2.82 MCal ME and 3.07 MCal ME, and 11.5 % CP) and serially slaughtered at four endpoints at intervals of 20 to 22 days. Breed effects were evaluated in the nine parental breeds of Red Poll (RP), Hereford (H), Angus (A), Limousin (L), Braunvieh (B), Pinzgauer (P), Gelbvieh (G) , Simmental (S), and Charolais (C) that contributed to the three ‘composite’ populations. MARC-I was l/4 B, l/4 C, l/4 L, l/8 H, and l/8 A; MARC-II was l/4 G, l/4 S, l/4 H, and l/4 A; and MARC-III was l/4 RP, l/4 P, l/4 H, and l/4 A. Breed effects were important for growth traits; carcass traits; and retail product, fat trim and bone percentages, and weights. Even though mean slaughter weight was 126.6 lb heavier for Simmental, Gelbvieh and Charolais breeds, they did not differ from Limousins in retail product weight because of their lower dressing percentages, higher fat trim percentages, and higher bone percentages. The effects of dietary energy density were important for most traits, and little interaction occurred between breed group and dietary energy density. The MARC-III composite had lighter final and carcass weights, a lower percentage of retail product, a higher percentage of fat trim, and a higher percentage of ribeye fat than the MARC-I composite, with the MARC-II composite being generally intermediate. Retained heterosis generally was significant for each composite population and for the mean of the three composite populations for weight of retail product, fat trim, and bone. For percentage of retail product and fat trim, MARC-II and MARC-III composites had a lower percentage of retail product and a higher percentage of fat trim than the mean of the contributing breeds. Composite populations or breeds provide an opportunity to use breed differences to achieve and maintain optimum additive genetic composition for carcass composition traits and to use heterosis to increase lean tissue growth rate and(or) to increase rate of fat deposition. 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 Heterosis en_US
dc.subject Growth en_US
dc.subject Carcass en_US
dc.subject Meat traits en_US
dc.title Breed effects and retained heterosis for growth, carcass, and meat traits in advanced generations of composite populations of beef cattle en_US
dc.type Conference paper en_US
dc.date.published 1994 en_US
dc.citation.epage 141 en_US
dc.citation.spage 134 en_US
dc.description.conference Cattlemen's Day, 1994, Kansas State University, Manhattan, KS, March 4, 1994 en_US
dc.contributor.authoreid mdikeman en_US

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