Avaliação reprodutiva de touros Braford por meio de marcadores moleculares STRs e SNPs e da termografia infravermelho

Content Provider	Semantic Scholar
Author	Menegassi, Silvio Renato Oliveira
Copyright Year	2014
Abstract	Genetic factors related to reproduction have low heritability to selection factors are of fundamental importance to fix desirable genes associated to a define population. We analyzed the molecular associations with reproductive performance in a herd of five small tandem regions (STRs BMS3004, ILSTS002, IDVGA51, HEL5, and AFZ1) and two single nucleotide polymorphisms (SNPs FSH receptor and LH receptor), genes involved in reproductive function. Samples were collected from 87 bulls submitted to analysis from 7 to 36 mo of age. The first experiment consisted of all 87 Braford bulls from 7 to 24 mo of age and analyzed by bull breeding soudness examination (BBSE). The second experiment consisted of 17 bulls examined by the PAC at 28, 32 and 36 mo of age and animals were part of the same previous experiment I. The number of alleles ranged from 2 to 8, having a frequency of 0.6% in the 169 and 175 alleles for ILSTS002 and HEL5, respectively. We also observed that 75% T alleles were observed for LH receptor. There was no significant association between markers BMS3004 STRs, HEL5, AFZ1, IDVGA51 and ILSTS002 and reproductive performance in both experiments. However, in experiment I, the SNP LHR showed suggestive relation to the identification of scrotal circumference (SC) less than 29 cm at 24 mo (P=0.07). The FSHR SNP showed a significant association with the GG genotype for low SC (P=0.02) at 24 months, the CG and GG genotypes to identify SC less than 29 cm (P=0.003) and CC genotype for highest score in BBSE. In the second experiment, the SC were analyzed at 7, 24, 28, 32 and 36 mo and the BBSE at 24, 28, 32 and 36 mo for LHR in the SNP, suggests the ratio TT genotype with a smaller SC was observated 7 mo of age (P=0.08). We observed a difference for FSHR in relation to the largest SCat 7 (P=0.02), 24 (P=0.01) 28 (P=0.03) 32 (P=0.02) and 36 (P=0.03) mo of age with the CC genotype, but was not found in relation to the BBSE in both markers. A strong association of FSHR genotype showing a GG higher for SC and BBSE and a lower CC genotype. In conclusion, we observed a strong association of FSHR SNP genotype GG higher for SC and BBSE reduced the possibility of CC genotype and when found the CG and GG genotypes.
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Language	English
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Resource Type	Article