SELCTION INDEX FOR SOME BODY MESUREMENTS TOWARDS IMPROVING MILK PRODUCTION IN DHOFARI GOAT | ||||
| Egyptian Journal of Sheep and Goats Sciences | ||||
| Article 1, Volume 9, Issue 1, April 2014, Page 1-8 PDF (226.78 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejsgs.2014.26749 | ||||
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| Authors | ||||
| El-Wakil, Salwa I.1; T. A. Fooda2 | ||||
| 1Animal and Poultry Breeding Dept., Desert Research Centre, El-Matareya, Cairo, Egypt. | ||||
| 2Buffalo Breeding Research Dept., Animal Production Research Institute, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| ABSTRACT The present study investigate the possibilities of improving milk production in Dhofari goat raised at Salalah of Sultanate of Oman through selection index containing body weight and dimensions at birth. Records of 190 Dhofari does, daughters of 35 sires were available for this study. During two successive years, data were collected on the same animal at birth (birth weight, BW; body length, BL; body height at withers, BH; heart girth, HG and rear girth, RG) and after the first lactation season (total milk yield, TMY). The present study estimated genetic and phenotypic parameters for the studied traits and constructed 19 selection indices to predict TMY in Dhofari goat. The present study estimated averages of BW, BL, BH, HG, RG and TMY as 2.9 kg, 31.4 cm, 34.7 cm, 33.6 cm, 37.0 cm and 50.0 kg, respectively. Among body dimensions, HG and RG were more variable than BL and BH. Heritability estimates for all studied traits were little and ranged from 0.002 to 0.1. The correlation coefficients among all studied traits were genetically high and phenotypically low. Genetic correlations between TMY and all live body measurements were close to one and much higher than the corresponding phenotypic ones. Genetically and phenotypically, TMY had positive correlations with BW, BL and BH and negative ones with HG and RG. The maximum accuracy of the full index was 0.45. The greatest improvement in TMY was +0.25 kg. Selection on all indices reduced HG and RG. Selection on I13 while reducing HG (-0.31 cm) and RG (-0.42 cm), it increases the size of animal probably through BL (+0.11cm) and BH (+0.18 cm). The present study concluded that the simplified selection index (I13) utilizing individual kid performance (HG and RG at birth) is the most efficient (rTI =0.38), attain adequate improvement in TMY (+0.21 kg), less expensive and being about 13% more efficient in the improvement than direct selection for milk yield alone compared with the other studied indices. Thus, I13 can be used as a selection criterion for the simultaneous improvement of milk and meat production in Dhofari goat. | ||||
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