Abstract
The present study describes the expression of genes in the Longissimus dorsi muscle related to meat quality of hair lambs finished in an Integration Crop-Livestock system. Twenty-eight non-castrated lambs of two breeds, Somalis Brasileira and Santa Inês, at 120 ± 15 days of age, with an average initial live weight of 18 ± 3.1 kg, were kept in a pasture-based finishing system with supplementation. Upon reaching 28 kg body weight, animals were sent for slaughter. Samples of the Longissimus dorsi and Biceps femoris muscle were harvested for analyses of gene expression and physicochemical properties. Significant differences were detected between the breeds for tissue and chemical composition, whereas the physical aspects did not differ. We observed the expression of six genes related to lipid synthesis (acetyl-CoA carboxylase [ACACA], fatty acid synthase [FAS], stearoyl-CoA desaturase [SCD], lipoprotein lipase [LPL], cell death-inducing DFFA-like effector A [CIDEA], and thyroid hormone responsive [THRSP]) and six genes related to molecular synthesis (myostatin [MSTN], growth differentiation factor 8 [GDF8], insulin-like growth factor 1 [IGF1], insulin-like growth factor 2 [IGF2], delta-like 1 homolog [DLK1], and growth hormone receptor [GHr]) in both breeds. The Santa Inês breed and the Somalis Brasileira showed similar expression patterns of genes related to lipogenesis and myogenesis of the Longissimus dorsi muscle, with the exception of the THRSP gene, in which the Somalis Brasileira have more receptors for the action of thyroid hormones, which resulted in greater thickness of fat in the carcass (subcutaneous fat) and higher lipid content in the chemical composition of the meat.
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Data availability
Data will be made available on request.
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Acknowledgements
To the Federal Institute of Education, Science and Technology of Ceará (IFCE/Tauá, CE). To the Municipality of Tauá for the structural support and the Escola Agrícola Francisca Cavalcante Fialho for the structure made available to carry out this research. To Vale do Acaraú State University (UVA), Federal University of Ceará (UFC), State University of Ceará (UECE) and University of Fortaleza (UNIFOR).
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The National Council for Scientific and Technological Development - CNPq.
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Thyarlon Bergson Chaves Lima - Writing – draft preparation, review and editing; Statistical analysis, Fata collection, Final Review. Robson Mateus Freitas Silveira - review and editing, Visualization, Final Review. João Paulo Arcelino do Rêgo: Conceptualization, Supervision, Final review, Validation. Visualization, Methodology, Funding acquisition, Investigation, Project administration. Arlindo de Alencar Araripe Noronha Moura – Supervision, Methodology, Validation, Final review. Carlos Henrique Lobo - Statistical analysis, Supervision, Methodology, Concepta McManus – Conceptualization; review and editing. Nielyson Junior Marcos Batista – Conceptualization, Supervision, data collection. Patrícia Guimarães Pimentel – Conceptualization, Supervision, Final Review. Maria Rosalba Moreira das Neves – Conceptualization, Supervision, Final Review. Aline Vieira Landim – Conceptualization, Supervision, Final Review.
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Chaves Lima, T., Silveira, R.M.F., do Rêgo, J.P.A. et al. Gene expression in the Longissimus dorsi muscle related to meat quality from tropical hair lambs. Trop Anim Health Prod 56, 213 (2024). https://doi.org/10.1007/s11250-024-03999-9
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DOI: https://doi.org/10.1007/s11250-024-03999-9