Candidate genes for growth traits in beef cattle crosses Bos taurus × Bos indicus

Abstract

Records of 192 Hard henu cattle pertaining to first lactation traits over a period of 6years from 2008 to 2014were collected from history cum pedigree sheets maintained at Cattle breeding farm, Department of Animal Genetics and Breeding Lala Lajpat Rai University of Veterinary and Animal Sciences, Hisar. Data were analysed by LSML(Harvey, 1990) using mixed linear model having effect of sire as random and that of year and season of calving as fixed. The first lactation traits studied were first lactation milk yield (FLY), first lactation length (FLL) first service period (FSP) and first calving interval (FCI). The overall least squares means FLY, FLL, FSP and FCI were averaged as 2392.92±70.45 kg,317.70±15.87days, 160.20± 18.08 days and 448.90± 15.13 days, respectively. The effect of period of calving was not significant for all the first lactation traits under study except for FSP. Similarly, the effect of season of calving was not significant for all the first lactation traits except for FSP. The heritability estimates for different first lactation traits were obtained as 0.27±0.34, 0.14±0.39, 0.13±0.38and 0.21±0.26forFLY, FLL, FSP and FCI, respectively. The genetic correlation among first lactation traits were positive and varied from 0.16 to 0.59 except the genetic correlation of FLL with FSP and FCI which was low and negative. The phenotypic correlation among first lactation traits were low to high positive and varied from 0.11 to 0.76, respectively.

Effects of CSN3 and LGB gene polymorphisms on production traits in beef cattle

“…These authors observed a negative effect of substitution of allele A with allele B of the κ-casein polymorphism on EPD (Expected Progeny Difference) for birth weight, weaning weight and maternal milk production, indicating that the A allele is favorable to these traits. However, our results agree with those obtained by Regitano et al (1999) and Tambasco et al (2003), who did not observe any influence of this polymorphism on growth traits in Canchim beef cattle and F1 animals of Canchim x Nelore, Simmental x Nelore and Angus x Nelore crosses, respectively. According to Pomp et al (1994), these contradictions can be explained by differences in the linkage equilibrium between markers and quantitative traits loci in the various populations studied, or by different epistatic interactions between the genetic bases of these populations and quantitative trait loci.…”

“…Regitano et al (1999) did not observe allele variations between different generations of a Canchim herd and suggested that this polymorphism is not associated with phenotypic traits subjected to selection in this herd. Similarly, Tambasco et al (2003) did not observe an isolated influence of the LGB/HaeIII polymorphism on the growth traits of crossbred Canchim x Nelore, Simmental x Nelore and Angus x Nelore cattle. However, these authors found a significant interaction (epistasis) between this marker and a polymorphism of the growth hormone gene influencing weight gain.…”

Association of GH and IGF-1 polymorphisms with growth traits in a synthetic beef cattle breed

“…Tambasco et al (2003) observed a positive association between genotype LV and daily body weight gain (BWG) from weaning to yearling in Bos taurus X Bos indicus crosses. It is also in agreement with the results observed in a Simmental population, where the LV genotype was associated with a higher BWG than LL and VV (Schlee et al, 1994).…”

Growth Hormone Gene Polymorphism and Its Association with Partial Cumulative Milk Yields of Holstein Friesian Dairy Cattle

“…By comparing the results of observed heterozygosity analysis (H o ) and expected heterozygosity (He) at GH|AluI gene indicated no statistically difference (Table 2). Tambasco et al (2003) stated that if the value of observed heterozygosity (H o ) is much lower compared to that value of expected heterozygosity (H e ), it might indicate a more intense selection or a higher degree of inbreeding.…”