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Rajasthan University of Veterinary and Animal Sciences, Bikaner (2013)

Evaluation and Genetic Improvement of Sirohi Goats for Growth Performance under Rural Conditions in the Southern Rajasthan

BHAKAR, SUNIL KUMAR

Titre : Evaluation and Genetic Improvement of Sirohi Goats for Growth Performance under Rural Conditions in the Southern Rajasthan

Auteur : BHAKAR, SUNIL KUMAR

Université de soutenance : Rajasthan University of Veterinary and Animal Sciences, Bikaner

Grade : Master of Veterinary Science (Animal Breeding and Genetics) 2013

Résumé
For present investigation growth records of 3465 Sirohi kids born during 2006-2012 in farmers flocks of the villages of the Nathdwara, Railmagra, Devegarh clusters of Rajasamand district, Bhadsoda cluster of Chittorgarh district and Vallabhnagar cluster of Udaipur district, maintained under ICAR sponsored All India Co ordinated Research Project (AICRP) on Sirohi goats, Livestock Research Station, Udaipur (Raj.) were analyzed. The overall least-squares means were estimated as 2.10± 0.060, 13.29±0.428, 16.94±0.650, 20.00±0.868 and 24.87±1.105 kg at birth, 3, 6, 9 and 12 months of age, respectively. The effect of sire, cluster, year of birth, type of kidding and sex of kid were observed as highly significant (P≤0.01) on body weights at birth, 3, 6, 9 and 12 months of age. The effect of season of birth was non-significant on birth weight but highly significant (P≤0.01) on body weights at 3, 9 and 12 months of age and significant (P≤0.05) on body weight at 6 months of age. The effect of parity of dam on body weights of kids was non-significant at birth, 3 and 9 months of age but highly significant (P≤0.01) at 6 months of age and significant (P≤0.05) at 12 months of age. The effect of dam’s weight at kidding on body weights of kids was estimated as positive and highly significant (P≤0.01) at birth, 3 and 12 months of age but non-significant at 6 and 9 months of age. The heritability estimates for body weights at birth, 3, 6, 9 and 12 months of age were 0.50±0.087, 0.70±0.114, 0.62±0.108, 0.64±0.115 and 0.75±0.137, respectively. Estimates of genetic correlations between body weights at different ages were positive and ranged from 0.19± 0.149 to 0.93±0.028. Estimates for phenotypic correlations between body weights at different ages ranged from 0.21±0.023 to 0.77±0.019. Among 26 selection indices constructed by incorporating body weights at birth, 3, 6, 9 and 12 months of age, in different combinations, the index I22 (0.3532 BWT + 0.2112 3WT + 0.1374 6WT + 0.1892 12WT) was adjudged best as it was more accurate (rIH= 0.4927) and resulted maximum genetic gain in 12 months body weight (0.8433). Among two stage selection indices, index MSI42 (first stage = 0.1173 BWT + 0.1168 3WT + 0.1236 6WT) + (second stage= 0.4026 BWT + 0.2649 3WT + 0.2002 6WT + 0.0543 9WT + 0.2333 12 WT) found more efficient (∆H= 1.3730) than others. Though the multistage selection resulted in slower gain but reduced the cost of selection.

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