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20171
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Subject: Animal Genetics and Breeding × Author: SARMA, LOOPAMUDRA × End date: 2019 × Start date: 2016 × Type: Thesis ×
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    ThesisItemOpen Access
    PERFORMANCE EVALUATION AND IDENTIFICATION OF POLYMORPHISM OF GENES AFFECTING GROWTH AND REPRODUCTION IN ASSAM HILL GOAT
    (2017-01) SARMA, LOOPAMUDRA; Nahardeka, Naba
    The present work was conducted to evaluate the performance in respect of growth and reproductive traits as well as identification of polymorphism of FecB, POU1F1 and BMP4 gene and their association with growth and reproductive traits of Assam Hill goat. Data on 960 animals for growth and morphometric traits, 324 animals for reproductive traits and 80 animals for molecular genetic analysis belonging to 3 populations of Assam Hill goat maintained at three field units viz., Batabari, Nahira and Tetelia were utilized. The least-squares means for body weight, height at withers, heart girth and body length were 1.166 ± 0.008 kg, 26.198 ± 0.070 cm, 26.695 ± 0.096 cm and 29.482 ± 0.119 cm at birth; 4.590 ± 0.083 kg, 36.850 ± 0.105 cm, 40.741 ± 0.115 cm and 39.703 ± 0.108 cm at 3 months; 7.557 ± 0.049 kg, 41.231 ± 0.121 cm, 44.621 ± 0.115 cm and 50.778 ± 0.172 cm at 6 months; 9.934 ± 0.044 kg, 43.902 ± 0.120 cm, 48.890 ± 0.099 cm and 55.552 ± 0.170 cm at 9 months, and 12.549 ± 0.046 kg, 46.791 ± 0.112 cm, 52.765 ± 0.090 cm and 58.392 ± 0.207 cm at 12 months of age, respectively. Location had significant effect on body weight and height at withers at all age groups; on heart girth at 3, 6, 9 and 12 months, and on body length at birth, 3, 6 and 12 months of age. Season of birth exerted significant effect on body weight at 9 and 12 months; on height at withers at 12 months and on body length at birth, 6, 9 and 12 months of age. Significant effect of sex was observed on body weight at 9 and 12 months, on height at withers at 6, 9, and 12 months, and on heart girth and body length at 3, 9 and 12 months of age. The least-squares means for kid size at birth, kid size at weaning, age at first kidding and gestation period (pertaining to first parity) were 1.142 ± 0.035, 1.140 ± 0.034, 410.147 ± 4.046 days and 147.135 ± 0.376 days, respectively, and for kid size at birth, kid size at weaning, gestation period, service period and kidding interval (pertaining to all parities) were 1.370 ± 0.030, 1.345 ± 0.030, 147.961 ± 0.246 days, 73.773 ± 2.111 days and 221.592 ± 2.134 days, respectively. Location and parity exerted significant effect on kid size at birth, kid size at weaning, service period and kidding interval, and season of kidding exerted significant effect on service period and kidding interval. The heritability estimates for body weight and body measurements were moderate, whereas; heritability estimates for reproductive traits were low. The phenotypic and genetic correlation among body weights and body measurements at birth, 3, 6, 9 and 12 months of age were positive in direction and high in magnitude. Positive and high phenotypic and genetic correlation were observed between kid size at birth and kid size at weaning, and service period and kidding interval. The phenotypic correlations between other reproductive traits were either low or suffered from high standard errors. All reproductive traits under study exhibited low genetic correlations except between kid size at birth and age at first kidding. PCR-RFLP analysis of FecB, POU1F1 and BMP4 gene revealed monomorphic banding pattern. In sequencing, no restriction site was found for AvaII in FecB gene, four restriction sites were found for DdeI in POU1F1 gene and one restriction site for HaeIII in BMP4 gene. In case of BMP4 gene, an SNP was observed at position 159 (A→T) in goats with history of multiple births. This finding reveals that the animals with a history of single birth have A nucleotide instead of T as observed in animals with history of multiple births.