TY - JOUR AU - Bosques, Jonael AU - Pagán-Morales, Melvin AU - Casas, Américo AU - Rivera, Aixa AU - Cianzio, Danilo PY - 2015/10/01 Y2 - 2024/03/28 TI - Effect of polymorphisms in the µ-calpain and calpastatin genes on economically important traitsof beef cattle in Puerto Rico JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 99 IS - 2 SE - Articles DO - 10.46429/jaupr.v99i2.3025 UR - https://revistas.upr.edu/index.php/jaupr/article/view/3025 SP - 87-104 AB - The associations between single nucleotide polymorphisms (SNP) in the µ-calpain (<em>CAPN1</em>-316 and <em>CANP1</em>-4751) and calpastatin (<em>CAST</em>) genes and growth traits were evaluated in a population of Senepol, Charoláis and Senepol x Charolais bulls (n=99). In another study, associations were evaluated between these SNP and carcass traits of a subgroup of 42 animals submitted to three dietary treatments. The SNP <em>CAPN</em>1-316 was associated with daily weight gain at 205 and 240 d, and with weaning age, wherein animals with CG genotype were heavier, gained weight faster, and were younger at weaning than animals with GG genotype. The latter presented heavier <em>Biceps femoris</em>, <em>Semitendinosus</em>, and <em>Gluteus</em> spp. muscles, but CG animals had a superior <em>Longissimus dorsiarea</em>. The <em>CAPN1</em>-4751 gene was related to birth weight, Longissimus dorsi weight, and with muscle to bone ratio, and for these traits the TT genotype was superior to the CT. The <em>CAPN1</em>-316 and <em>CAPN1</em>-4751 C alleles were found to be correlated with differences in meat tenderness measured at 0 d <em>postmortem</em>. The <em>CAST</em> SNP was not associated with any of the traits evaluated in this experiment. These results indicate that nucleotide substitution in the <em>CAPN</em>1 gene can produce differences in somatic growth in young bulls selected for beef production in Puerto Rico. ER -