TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP | ||||
| Journal of Animal and Poultry Production | ||||
| Article 1, Volume 31, Issue 1, January 2006, Page 91-102 PDF (3.96 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2006.235398 | ||||
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| Authors | ||||
| F. H.H. Farrag1; N. A. Shalaby1; H. R. Metawi2 | ||||
| 1Production Department, Faculty of Agriculture, Mansoura Jniversity, El-Mansoura, Egypt. | ||||
| 2nimal Production Research Institute, Ministry of Agriculture, Dokki ‘3za, Egypt. | ||||
| Abstract | ||||
| A total of 1968 records for 706 Rahmani ewes were coflected from El-Serw ntal Station (North Nile Delta) belonging to Animal Production Research Ministry of Agriculture, Egypt, during the period from 1991 to 2001. (enetic parameters and breeding values for the first lambing and lifetime ri traits were investigated. The studied traits of the first lambing included of lambs born per ewe lambing (NLB), number of lambs weaned per ewe (NLW), litter weight at birth (LW B) and litter weight at weaning (LWW). White, number of lambs born (TN LB), total number of lambs weaned (TN LW), total birth of lambs (TLWB) and totI weight of lambs weaned (TLWW) per ewe’over six cng opportunities were used as lifetime production traits. Traits studied were ayzed by using single-trait animal model analyses. The overall means and riard dêviations (SD) obtained in the current study for NLB, NLW, LWB and LWW r first lambing were 1.13, 1.09 lamb, 3.35 and 16.17 kg, respectively. White, the rafI means of TNLB, TNLW, TLWB and TLWW were 3.38. 3.08 lamb, 10.59 and 72 kg, respectively. Heritabilities for NLB, NLW, LWB and LWW in the first lambing obtained ¡n the rent study were 0.13±0.06, 0.08±0.06, 0.15±0.09 and 0.09±0.06, respectively. The ¿stmates obtained in the current study were 0.11±0.06, 0.08±0.06. 0.13±0.07 and :10±0.08 for TN LB, TNLW, TLWB and TLWW, respectively. The genetic correlation xng the first lambing traits ranged between 0.63 and 0.95, while it ranged between :95 and 0.99 among lifetime production traits, but the genetic correlation between erent first lambing and different lifetime production traits were ranged from 0.12 d 0.45. The breeding values of first lambing (EBV) for all animal were 0.40, 0.22 mbs, 1.01 and 2.82 kg for NLB, NLW, LWB and LWW, respectively, while the xrresponding values for sire were 0.34, 0.22 lambs, 0.78 and 2.5v kg, respectively. Soearrnan rank correlations among first lambing traits were ranged between 0.39 and D.82 for all animals and from 0.47 to 0.81 for EBV of sires. Also, higher rank Dorrelations among different lifetime production traits were recorded. The obtained low to moderate heritability estimates, high coefficient of .-ariations and the wider range of animals and sires breeding values for different traits studied ¡n the present study, especially lifetime production traits, indicating potential for genetic improvement of lifetime traits of Rahmani sheep. | ||||
| Keywords | ||||
| Egypt; Rahmani; sheep; lifetime production traits; animal model; genetic parameters; breeding value | ||||
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