Tenderness

Expression of ADAMTS4 and ADAMTS5 in longissimus dorsi muscle related to meat tenderness in Nanyang cattle

X. H. Zhang, Qi, Y. X., Gao, X., Li, J. Y., and Xu, S. Z., “Expression of ADAMTS4 and ADAMTS5 in longissimus dorsi muscle related to meat tenderness in Nanyang cattle”, vol. 12, pp. 4639-4647, 2013.

The ADAMTS4 and ADAMTS5 are secreted proteases, which can cleave aggrecan, brevican and versican to regulate rebuilding of the extracellular matrix. We analyzed the ADAMTS4 and ADAMTS5 gene expression patterns in longissimus dorsi muscle at intervals from 135 days fetal age to 30 months old by qRT-PCR in Nanyang cattle. Expression of ADAMTS4 was significantly higher in 135 and 185-day-old fetuses than at other stages, while expression of ADAMTS5 decreased during development.

Expression of calpastatin and myostatin genes associated with lamb meat quality

A. Bagatoli, Gasparino, E., Soares, M. A. M., Amaral, R. M., Macedo, F. A. F., Voltolini, D. M., and Del Vesco, A. P., “Expression of calpastatin and myostatin genes associated with lamb meat quality”, vol. 12, pp. 6168-6175, 2013.

Calpastatin (CAST) is an endogenous calpain inhibitor and its main function is to modulate the proteolytic action of enzymes responsible for post-mortem myofibril deterioration. The myostatin gene (GDF-8) acts as a negative regulator of skeletal muscle growth. The expression of these two genes, as well as their interaction, affects the quality of the meat, especially the tenderness phenotype.

Single nucleotide polymorphisms in Brahman steers and their association with carcass and tenderness traits

T. Smith, Thomas, M. G., Bidner, T. D., Paschal, J. C., and Franke, D. E., “Single nucleotide polymorphisms in Brahman steers and their association with carcass and tenderness traits”, vol. 8, pp. 39-46, 2009.

Data from purebred Brahman steers (N = 467) were used to study the association of single nucleotide polymorphisms (SNP) with carcass traits and measures of tenderness. Fall weaned calves were grazed and fed in a subtropical environment and then harvested for processing in a commercial facility. Carcass data were recorded 24 h postmortem. Muscle samples and primal ribs were obtained to measure calpastatin activity and shear force. DNA was used to determine genotypes of thyroglobulin (TG5), calpastatin (CAST) and μ-calpain (CAPN 316 and CAPN 4751) SNP.

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