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Farrag, F., Shalaby, N., Metawi, H. (2006). TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP. Journal of Animal and Poultry Production, 31(1), 91-102. doi: 10.21608/jappmu.2006.235398
F. H.H. Farrag; N. A. Shalaby; H. R. Metawi. "TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP". Journal of Animal and Poultry Production, 31, 1, 2006, 91-102. doi: 10.21608/jappmu.2006.235398
Farrag, F., Shalaby, N., Metawi, H. (2006). 'TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP', Journal of Animal and Poultry Production, 31(1), pp. 91-102. doi: 10.21608/jappmu.2006.235398
Farrag, F., Shalaby, N., Metawi, H. TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP. Journal of Animal and Poultry Production, 2006; 31(1): 91-102. doi: 10.21608/jappmu.2006.235398

TION OF GENETIC PARAMETERS USING ANIMAL FOR FIRST LAMBING AND LIFETIME PRODUCTION S OF RAHMANI SHEEP

Article 1, Volume 31, Issue 1, January 2006, Page 91-102  XML 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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