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Polymorphism of beta-lactoglobulin gene in Indian goats and its effect on milk yield

100%

Kumar A., Rout P. K., Roy R.

Journal of Applied Genetics

2006

vol. 47

issue 1

49?53

Polymorphism in the beta-LG gene in the Indian goat was investigated by the SDS-PAGE and PCR-RFLP method. SDS-PAGE was carried out in 1098 samples belonging to 8 different breeds of Indian goats. The electrophoretic pattern in the beta-LG locus showed the presence of AA and AB genotypes with frequencies of 0.81 and 0.19, 0.89 and 0.11, 0.50 and 0.50, 0.80 and 0.20, 0.84 and 0.16, 1.00 and 0.00, 0.98 and 0.02 and 0.950 and 0.050 in Jamunapari, Barbari, Marwari, Sirohi, Jakhrana, Beetal, Local UP and Local MP goats, respectively. A total of 358 individuals belonging to 13 different genetic groups were analyzed by the PCR-RFLP method. The amplified product was observed as 426 bp and the restriction digestion with SacII revealed three genotypes, namely S1S1, S1S2 and S2S2 at the ?-LG locus. The frequency of the S2S2 genotype ranged from 0.42 to 1.00 in the population. An analysis was carried out in Jamunapari and Barbari goats to observe the effect of the beta-LG genotype on 90-day milk yield. Least squares analysis of data showed that beta-LG AA animals had higher milk yield than the beta-LG AB genotype in both breeds (P < 0.01).

Associations between 2 paternal casein haplotypes and milk yield traits of Swiss Fleckvieh cattle

88%

Braunschweig M. H.

Journal of Applied Genetics

2008

vol. 49

issue 1

69-74

Associations between casein haplotypes and milk yield traits of offspring from 5 Swiss Fleckvieh AI test bulls were investigated. The analysis was performed by using a daughter design, where each daughter inherited either paternal haplotype B-A1-A-A or B-A2-A-A for alleles of alpha s1-, beta, alpha s2- and -casein genes. The substitution effects of paternal CSN2 A1 versus A2 on protein yield deviations (YDs) were significant (P < 0.05), whereas their effects on milk and fat YDs were not. The paternal substitution effects of the CSN2 A1 versus the A2 allele on protein YDs within the 5 sires did not reach the significance level. This is due to the contrary allele substitution effect of a sire compared to the other 4 sires. The effects of maternal haplotypes on milk, protein and fat YDs were not significant. However, it is noteworthy that the effects of haplotypes with a low frequency in the population deviate largely from the most frequent haplotype B-A2-A-A. The effects of beta-lactoglobulin (BLG) genotypes were significant for protein YDs but not for milk and fat YDs. The association between the paternal CSN2 A1 and A2 alleles and milk protein YDs within sires but not milk and fat YDs indicate an interaction, which might be a consequence of CSN2 heterogeneity or a closely linked gene that is contributing to the estimated effects.

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2 Journal of Applied Genetics

1 2008

1 2006

1 Braunschweig M. H.

1 Kumar A.

1 Rout P. K.

1 Roy R.

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Polymorphism of beta-lactoglobulin gene in Indian goats and its effect on milk yield

Associations between 2 paternal casein haplotypes and milk yield traits of Swiss Fleckvieh cattle