Abstract
Screening of bone morphogenetic protein receptor type- 1 gene (BMPR1B gene) also known as Fec B gene polymorphism was done for detecting the genetic basis of prolificacy in crossbred does of Bihar. The study revealed two allelic variants (A=0.48 and G=0.52) and three genotypes (AA=0.16, AG=0.62 and GG=0.22).The findings of thestudy indicate sign of introgression of mutant allele (G) into Jamunapari, Barbari, and Sirohi goats at village level from Black Bengal breed. The variation in litter size among the genotypes revealed the benefits of introgression of Fec B mutation in the crosses. The litter size showed variation among the three genotypes. Percentage singles, twins and triplets were 69, 29 and 2 in AA genotype; 42, 52 and 6 in AG genotype and 14, 66 and 20 in GG genotype, respectively.
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