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Methods of carcass classification based on subjective assessments of carcass fatness and of carcass conformation: effect of sex on the prediction of tissue composition in carcasses of sucking lambs

Published online by Cambridge University Press:  18 August 2016

E. Miguel ,
F. Ruiz de Huidobro ,
M. T. Díaz ,
S. Velasco ,
S. Lauzurica ,
C. Pérez ,
E. Onega ,
B. Blázquez  and
V. Cañeque
E. Miguel*
Affiliation:
Instituto Madrileño de Investigación Agraria y Alimentaria, Apartado 127, 28800 Alcalá de Henares, Spain
F. Ruiz de Huidobro*
Affiliation:
Instituto Madrileño de Investigación Agraria y Alimentaria, Apartado 127, 28800 Alcalá de Henares, Spain
M. T. Díaz
Affiliation:
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Apartado 8111, 28080 Madrid, Spain
S. Velasco
Affiliation:
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Apartado 8111, 28080 Madrid, Spain
S. Lauzurica
Affiliation:
Universidad Complutense, Avenida Puerta de Hierro, s/n. 28040 Madrid, Spain
C. Pérez
Affiliation:
Universidad Complutense, Avenida Puerta de Hierro, s/n. 28040 Madrid, Spain
E. Onega
Affiliation:
Instituto Madrileño de Investigación Agraria y Alimentaria, Apartado 127, 28800 Alcalá de Henares, Spain
B. Blázquez
Affiliation:
Instituto Madrileño de Investigación Agraria y Alimentaria, Apartado 127, 28800 Alcalá de Henares, Spain
V. Cañeque
Affiliation:
Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria, Apartado 8111, 28080 Madrid, Spain
*
†Corresponding author. E-mail address: felipe.ruiz@imia.madrid.org
†Corresponding author. E-mail address: felipe.ruiz@imia.madrid.org
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Abstract

Forty-eight sucking lambs (26 males and 22 females) of the Manchega breed were used in this work. Lambs were slaughtered at 10, 12 and 14 kg live weight. Carcass degree of fatness was assessed by three assessors from colour photographs of the carcasses, using the European Union scale for light lambs (EU), the Colomer-Rocher method (CF) and another new scale developed by our group (sucking lambs scale, SL). Carcass conformation was assessed according to the Colomer-Rocher method (CC). Fatness and conformation scales were divided to give 0·25 points in each interval. Left half-carcasses were jointed and dissected into lean, fat and bone. Muscle proportion, bone proportion and whole fat proportion (obtained by addition of every fat depot: subcutaneous fat, intermuscular fat, inguinal fat and kidney knob and channel fat) were determined. Male and female carcasses showed a very different tissue composition: both groups had statistically significant differences (P < 0·05) in 20 out of 25 tissue composition variates. Males showed a higher number of variates that were well correlated with assessors’ scoring than females. Correlation coefficients between most of the tissue composition variates and assessors’ scores were higher in males. Furthermore, the number of variates that were significantly correlated with assessors’ scores was lower in females. Therefore, subjective methods for the estimation of carcass degree of fatness and of carcass conformation are poor predictors of tissue composition in female sucking lamb carcasses.

Keywords

carcassesclassificationsexsheeptissues
Type
Growth, development and meat science
Information
Animal Science , Volume 77 , Issue 3 , December 2003 , pp. 383 - 393
Copyright
Copyright © British Society of Animal Science 2003

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