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Meat Sci. 2016 Apr;114:121-129. doi: 10.1016/j.meatsci.2015.12.018. Epub 2015 Dec 28.

Growth, carcass and meat quality traits in beef from Angus, Hereford and cross-breed grazing steers, and their association with SNPs in genes related to fat deposition metabolism.

Author information

1
Área de Investigación en Producción Animal, Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta Nac. 226 km 73.5, 7620 Balcarce, Buenos Aires, Argentina. Electronic address: papaleo.juliana@inta.gob.ar.
2
Instituto de Genética Veterinaria (IGEVET), UNLP-CONICET La Plata, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Calle 60 y 118 s/n, B1901AAP La Plata, Buenos Aires, Argentina.
3
Área de Investigación en Producción Animal, Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta Nac. 226 km 73.5, 7620 Balcarce, Buenos Aires, Argentina; Departamento de Producción Animal, Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), Ruta Nac. 226 km 73.5, 7620 Balcarce, Buenos Aires, Argentina.
4
Área de Investigación en Producción Animal, Estación Experimental Agropecuaria Balcarce, Instituto Nacional de Tecnología Agropecuaria (INTA), Ruta Nac. 226 km 73.5, 7620 Balcarce, Buenos Aires, Argentina.
5
Departamento de Producción Animal, Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata (UNMdP), Ruta Nac. 226 km 73.5, 7620 Balcarce, Buenos Aires, Argentina.
6
Instituto de Genética Veterinaria (IGEVET), UNLP-CONICET La Plata, Facultad de Ciencias Veterinarias, Universidad Nacional de La Plata, Calle 60 y 118 s/n, B1901AAP La Plata, Buenos Aires, Argentina; Departamento de Producción Animal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Ciudad de Buenos Aires, Argentina.

Abstract

Grazing steers from Angus and Hereford breeds, their cross-breeds and a three-way cross-breed (Limousin × Angus-Hereford) were measured for growth, carcass and meat quality traits. Breed effects were studied, and the association of SNPs with fat deposition and fatty acid (FA) composition (leptin, melanocortin-4 receptor, stearoyl-CoA desaturase, FA synthase and thyroglobulin) was tested. Limousin cross-breed showed the greatest final body weight, ultrasound rib eye area, dressing percentage, carcass and leg length, and the lowest backfat thickness and intramuscular fat content. Genetic groups had similar pH, shear force, cooking loss, L* and b* and n-6:n-3 ratio. Meat from 1/2-Angus presented greater a* than Limousin cross-breed. Whereas Angus had the highest total SFA content, Hereford had the lowest total SFA and the highest total MUFA. Limousin cross-breed had greater content of several individual PUFAs, total PUFA, n-6 and n-3 FA than Angus and 1/2-Angus. Leptin and FA synthase were associated with some FAs, supporting their influence over fat metabolism for grazing animals.

KEYWORDS:

Angus–Hereford cross-breeds; Carcass; Fatty acids; Growth; Meat quality; Single nucleotide polymorphisms

PMID:
26771144
DOI:
10.1016/j.meatsci.2015.12.018
[Indexed for MEDLINE]

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