Your browser doesn't support javascript.
loading
Prediction of retail product weight and percentage using ultrasound and carcass measurements in beef cattle.
Greiner, S P; Rouse, G H; Wilson, D E; Cundiff, L V; Wheeler, T L.
Afiliação
  • Greiner SP; Department of Animal Science, Iowa State University, Ames 50011, USA. sgreiner@vt.edu
J Anim Sci ; 81(7): 1736-42, 2003 Jul.
Article em En | MEDLINE | ID: mdl-12854810
ABSTRACT
Data from 534 steers representing six sire breed groups were used to develop live animal ultrasound prediction equations for weight and percentage of retail product. Steers were ultrasonically measured for 12th-rib fat thickness (UFAT), rump fat thickness (URPFAT), longissimus muscle area (ULMA), and body wall thickness (UBDWALL) within 5 d before slaughter. Carcass measurements included in USDA yield grade (YG) and quality grade calculations were obtained. Carcasses were fabricated into boneless, totally trimmed retail products. Regression equations to predict weight and percentage of retail product were developed using either live animal or carcass traits as independent variables. Most of the variation in weight of retail product was accounted for by live weight (FWT) and carcass weight with R2 values of 0.66 and 0.69, respectively. Fat measurements accounted for the largest portion of the variation in percentage of retail product when used as single predictors (R2 = 0.54, 0.44, 0.23, and 0.54 for UFAT, URPFAT, UBDWALL, and carcass fat, respectively). Final models (P < 0.10) using live animal variables included FWT, UFAT, ULMA, and URPFAT for retail product weight (R2 = 0.84) and UFAT, URPFAT, ULMA, UBDWALL, and FWT for retail product percentage (R2 = 0.61). Comparatively, equations using YG variables resulted in R2 values of 0.86 and 0.65 for weight and percentage of retail product, respectively. Results indicate that live animal equations using ultrasound measurements are similar in accuracy to carcass measurements for predicting beef carcass composition, and alternative ultrasound measurements of rump fat and body wall thickness enhance the predictive capability of live animal-based equations for retail yield.
Assuntos
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Composição Corporal / Bovinos / Tecido Adiposo / Músculo Esquelético / Carne Tipo de estudo: Diagnostic_studies / Prognostic_studies / Risk_factors_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: J Anim Sci Ano de publicação: 2003 Tipo de documento: Article
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Composição Corporal / Bovinos / Tecido Adiposo / Músculo Esquelético / Carne Tipo de estudo: Diagnostic_studies / Prognostic_studies / Risk_factors_studies Limite: Animals País/Região como assunto: America do norte Idioma: En Revista: J Anim Sci Ano de publicação: 2003 Tipo de documento: Article