| Prediction of physical and chemical body compositions of purebred and crossbred Nellore cattle using the composition of a rib section. | |
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MedLine Citation:
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PMID: 22147483 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The goal of this research was to develop empirical equations to predict chemical and physical compositions of the carcass and the body using the composition of the 9-11(th) rib section (Rib(9-11)) and other measurements. A database (n = 246) from 6 studies was developed and comprised of 37 bulls (BU), 115 steers (ST), and 94 heifers (HF) of which 132 were Nellore (NE), 76 were NE x Angus crossbreds (NA), and 38 were NE x Simmental crossbreds (NS). The right half carcass and the Rib(9-11) from the left half carcass were analyzed for ether extract (EE), CP, and water. The remaining components were chemically analyzed to determine the composition of the body. A stepwise procedure was used to determine the variable inclusion in the regression models. The variables included were EE in the Rib(9-11) (EER, %), CP in the Rib(9-11) (CPR, %), water in the Rib(9-11) (WR, %), visceral fat (pelvic, kidney, heart, and mesenteric fats; VF, %), organs plus viscera (OV, %), carcass dressing percentage (CD, %), cold carcass weight (CCW, kg), and empty BW (EBW, kg). There were no sex or breed effects on EE and CP compositions of the carcass (C(EE) and C(CP), %, respectively) and the equations were: C(EE) = 4.31 + 0.31×EER + 1.37×VF [n = 241, R(2) = 0.83, mean square error (MSE) = 4.53] and C(CP) = 17.92 + 0.60×CPR - 0.17×CD (n = 238, R(2) =0.50, MSE=1.58). On the other hand, breed affected water content in the carcass (C(W), %) and the equations were: C(W) = 48.74 + 0.28×WR - 0.017×EBW for NE; C(W) = 46.69 + 0.32×WR - 0.017×EBW for NA; and C(W) = 38.06 + 0.48×WR - 0.017×EBW for NS (n = 243, R(2) =0.67, MSE = 5.17). There was a sex effect on body chemical EE composition (BW(EE)) (BW(EE) = 2.75 + 0.33×EER + 1.80×VF for BU; BW(EE) = 1.84 + 0.33×EER + 1.91×VF for ST; and BW(EE) = 4.77 + 0.33×EER + 1.28×VF for HF (n = 243, R(2) = 0.89, MSE = 3.88). There were no sex or breed effects on CP composition in the body (BW(CP)) (BW(CP) = 14.38 + 0.24×CPR; n = 240, R(2) = 0.59, MSE=1.06). There was a sex effect for body water content (BW(W)) and the equations were: BW(W) = 38.31 + 0.33×WR - 1.09×VF + 0.50×OV for BU; BW(W) = 45.67 + 0.25×WR - 1.89×VF + 0.50×OV for ST; and BW(W) = 31.61 + 0.47×WR - 1.06×VF + 0.50×OV for HF (n = 241, R(2) = 0.81, MSE = 3.84). The physical carcass composition indicated a breed effect on all components and a sex effect for fat in the carcass. We concluded that body and carcass compositions can be estimated with Rib(9-11) for purebred and crossbred NE animals, but specific equations have to be developed for different groups of animals. |
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Authors:
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M I Marcondes; L O Tedeschi; S C Valadares Filho; M L Chizzotti |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-12-6 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Dec |
Date Detail:
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Created Date: 2011-12-7 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Texas A&M University, Department of Animal Science, College Station, TX 77843-2471, USA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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