Relative growth of carcass tissues of goat kids from five breed Types finished on pasture or feedlot

Raquel Vasconcelos Lourençon, Heraldo Cesar Gonçalves, Paulo Roberto Lima Meirelles, Richard Browning Junior, Maria Lenira Leite-Browning, Andréia Cristina Toniolo Chávari, Raquel Ornelas Marques, Gil Ignacio Lara Canizares, Natalia Santos Leal, Helen Fernanda Barros Gomes

Abstract


The aim of this study was to evaluate the effect of cross breeding, finishing system, and gender on the relative growth of carcass tissues of dairy kids. Seventy eight kids (39 male and 39 female) from five breed types were used: Alpine; ½ Boer + ½ Alpine (½ BA); ½ Nubian + ½ Alpine (½ ANA); ¾ Boer + ¼ Alpine (¾ BA); and ½ Nubian + ¼ Boer + ¼ Alpine (TC). Kids were distributed into two finishing systems: in pasture with doe (FS1) and weaned in feedlot (FS2). Kids were slaughtered at a mean age of 128.4 ± 7.9 days and mean live weight of 22.07 kg. The mean weight of half carcasses was 5.09 kg. To determine allometric growth, we used the exponential equation Y= aXb. In the half carcass, muscle tissue showed comparatively early growth in group ½ BA, whereas fat tissue of animals in FS1 had relatively late growth. Females exhibited early growth of muscle tissue, while in males this tissue was intermediate. The ½ BA first-cross improved carcass characteristics by enhancing the growth of muscle tissue.

Keywords


Allometry; Alpine; Bôer; Finishing system; Nubian.

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DOI: http://dx.doi.org/10.5433/1679-0359.2016v37n2p989

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional