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Allometric growth of ½ Dorper + ½ Santa Inês lambs slaughtered with different subcutaneous fat thicknesses

Authors :
Camilo Azevedo Santos
Francisco de Assis Fonseca de Macedo
Gladston Rafael de Arruda Santos
Anselmo Domingos Ferreira Santos
Maria Julia Araujo Feitosa Melo
Ludmila Couto Gomes Passetti
Alfredo Jorge Costa Teixeira
Natália Holtz Alves Pedroso Mora
Source :
Pesquisa Agropecuária Brasileira, Vol 55 (2020)
Publication Year :
2020
Publisher :
Embrapa Informação Tecnológica, 2020.

Abstract

Abstract: The objective of this work was to evaluate the allometric growth, the correlation of the cuts with the half carcasses, and the muscularity index of the leg of ½ Dorper + ½ Santa Inês lambs slaughtered with 2.0, 3.0, and 4.0 mm of subcutaneous fat thickness (SFT). Twenty-four non-castrated male lambs were used, being distributed according to their weight into three collective pens. Slaughtering occurred as the lambs reached the SFT predetermined by ultrasound. The half carcasses were weighed, dissected, and separated into five cuts: neck, shoulders, rib, loin, and leg. These cuts were dissected and weighed into muscle, subcutaneous fat, intermuscular fat, and bone. In the shoulders, lambs with 2.0 and 4.0 mm SFT showed early growth. In the rib, this early precocity was observed in lambs with 4.0 mm SFT. The leg showed isogonic growth in lambs with 3.0 and 4.0 mm SFT and was the cut that best correlated with the half carcass, regardless of the SFT. The slaughter of ½ Dorper + ½ Santa Inês lambs with 4.0 mm of subcutaneous fat allows obtaining a better allometric growth of the shoulder, rib, and leg cuts, as well as a better leg muscularity index.

Details

Language :
English, Spanish; Castilian, Portuguese
ISSN :
16783921
Volume :
55
Database :
Directory of Open Access Journals
Journal :
Pesquisa Agropecuária Brasileira
Publication Type :
Academic Journal
Accession number :
edsdoj.3d10a983462b4011a8d335239f821f94
Document Type :
article
Full Text :
https://doi.org/10.1590/s1678-3921.pab2020.v55.01651