Abstract

ACOSTA ABAD, Atzel et al. Effect of gene polymorphisms on milk production of Siboney de Cuba cattle. Rev Salud Anim. [online]. 2016, vol.38, n.3, pp.142-148. ISSN 0253-570X.

The objective of this study was to estimate the variance components, genetic parameters, and the individual effect of eight single nucleotide polymorphisms (SNPs) in the corresponding genes (α_S1-casein (CASA1), β-casein (BCAS), α_S2-casein (CASA2), κ-casein (KCAS), α-lactoalbumin (LAA), β-lactoglobulin (LAG), growing hormone (GH), and prolactin (PRL)) in the milk production of Siboney de Cuba cattle at 305-d of lactation.  In total, 1904 lactation records of 913 cows from 17 farms were analyzed under a repetability model. The minisequencing technique was used for uncovering the polymorphism in genes. The eight loci studied had a polymorphic behavior. The heritability and repeatability coefficients estimated for milk production were 0.12 and 0.33 at 305 days. LAG (p≤0.05) and PRL (p≤0,10) loci had a significant effect on milk production. Such coefficients were moderate, indicating that it is possible to obtain a positive response to selection in this population. The selection for both the LAG^AA and PRL^BB genotypes will result in cows having a higher milk production

Keywords : caseins; α-lactoalbumin; β-lactoglobulin; growth hormone; prolactin; heritability; milk production.

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