Article history: Received: 26-09-2017, Accepted: 22-01-2018, Published online: 27-02-2018
Corresponding author: Khaleel Jawasreh
E-mail: email@example.comCitation: Jawasreh K, Ismail ZB, Iya F, Castaneda-Bustos VJ, Valencia- Posadas M (2018) Genetic parameter estimation for pre-weaning growth traits in Jordan Awassi sheep, Veterinary World, 11(2): 254-258.
Aim: The aim of this study was to estimate the heritability, genetic and phenotypic correlations, and the genetic trends for pre-weaning growth traits including the birth weight (BWT), weaning weight (WWT), pre-weaning daily gain (PWDG), and weaning age (WA) in Awassi lambs.
Materials and Methods: A total of 5131 Awassi lambs from two Jordanian sheep breeding stations were used. A multitrait animal model and restricted maximum likelihood methods were used to estimate the covariances between the studied traits.
Results: The mean±standard deviation of BWT, WWT, PWDG, and WA was 4.48±0.8 kg, 17.13±0.7 kg, 0.2±0.07 g, and 65.5±0.7 days, respectively. Heritability estimates were 0.30±0.04 for BWT, 0.19±0.04 for WWT and PWDG, and 0.2±0.04 for WA. Positive genetic correlations were obtained between BWT and other traits, while negative correlations were obtained between WWT, PWDG, and WA (-0.50±0.12) and between WWT and WA (-0.67±0.14). The positive phenotypic correlation was obtained between WA and PWDG (0.63±0.01). The highest additive genetic variance was obtained for WA (34.58), while the lowest was estimated for PWDG (6.22E-04). The highest phenotypic variance was obtained for WA (175.5), while the lowest value obtained was for BWT (0.54). Maternal additive variance ranged between 0.13 and 0.03. The genetic trends were around zero for all studied traits.
Conclusion: Selection should be conducted using animals with high estimated breeding values through controlled breeding.
Keywords: Awassi sheep, breeding values, growth traits, heritability.
1. Gondro, C., van der Werf, J. and Hayes, B. (2013) Genome wide association studies and genomic prediction. Methods in Molecular Biology. Vol. 1019. Humana Press/Springer, London. [Crossref]
2. Galal, S., Gursoy, O. and Shaat, I. (2008) Awassi sheep as a genetic resource and efforts for their genetic improvement. Small Rum. Res., 79: 99-108. [Crossref]
3. Yilmaz, O., Denk, H. and Bayram, D. (2007) Effects of lambing season, sex and birth type on growth performance in Norduz lambs. Small Rum. Res., 68: 336-339. [Crossref]
4. Falconer, D.S. and Mackay, T.F.C. (1996) Introduction to Quantitative Genetics. 4th ed. Longman, Harlow, UK.
5. Jalil-Sarghale, A., Kholghi, M., Moradi, S.M., Moradi, S.H., Mohammadi, H. and Abdollahi-Arpanahir, R. (2014) Model comparisons and genetic parameter estimates of growth traits in Baluchi sheep. Slovak J. Anim. Sci., 47: 12-18.
6. M.O.A. (2012) Ministry of Agriculture, Statistical Year Book, Kingdom of Jordan. Ministry of Agriculture. Jordan.
7. Gilmour, A.R., Gogel, B.J., Cullis, B.R., Welham, S.J., Thompson, R. (2007) ASReml user Guide Release 2.0. VSN International Ltd. 5 the Water's House, Water House Street Hemel, Hempstead, HP1 1 ES, UK.
8. Gootwine, E. and Rozov, A. (2006) Seasonal effects on birth weight of lambs born to prolific ewes maintained under intensive management. Livest. Sci., 105: 277-283. [Crossref]
9. Jawasreh, K.I.Z. and Khasawneh, A.Z. (2007) Studies of some economic characteristic on Awassi lambs in Jordan. Egyptian J Sheep Goat Sci., 2: 101-110.
10. Jawasreh, K.I. Z., Awawdeh F.T., Al-Khasawneh, A.Z., Shdaifat, B., Al-Shboul, H. and Al-Hamed, B. (2009) The effect of some placental factors in birth weight of Awassi lambs. Res. J. Anim. Vet. Sci., 4: 5-8.
11. Oosting, S.J., Mekoya, A., Fernandez-Rivera, S. and Van der Zijpp, A.J. (2011) Sesbania sesban as a fodder tree in Ethiopia livestock farming systems feeding practices and farmers perception of feeding effects on sheep performance. Livest. Sci., 139: 135-141. [Crossref]
12. Supakorn, C., Pralomkarn, W. and Anothaisinthawee, S. (2013) Estimation of genetic parameters and genetic trends for weight and body measurements at birth in sheep populations in Thailand. Songklanakarin J. Sci. Technol., 35: 1-10.
13. Rashidi, A., Mokhtari, M.S., Safi, J.A. and Mohammad, A.M.R. (2008) Genetic parameter estimates of pre-weaning growth traits in Kermani sheep. Small Rum. Res., 74: 165-171. [Crossref]
14. Prakash, V., Prince, L.L.L., Gowane, G.R. and Arora, A.L. (2012) The estimation of (co) variance components and genetic parameters for growth traits and Kleiber ratios in Malpura sheep of India. Small Rum. Res., 108: 54-58. [Crossref]
15. Gowane, G.R., Chopra, A., Prakash, V. and Arora, A.L. (2010) Estimates of (co)variance components and genetic parameters for body weights and first greasy fleece weight in Malpura sheep. Livest. Sci., 131: 94-101. [Crossref]
16. Gizaw, S., Lemma, S., Komen, H. and Johan, A.M. (2007) Estimates of genetic parameters and genetic trends for live weight and fleece traits in Menz sheep. Small Rum. Res., 70: 145-153. [Crossref]
17. Jafaroghli, M., Rashidi, B., Mokhtari, M.S. and Shadparvar, A.A. (2010) (Co) variance components and genetic parameter estimates for growth traits in Moghani sheep. Small Rum. Res., 91: 170-177. [Crossref]
18. Roshanfekr, H., Mamouei, M., Mohammadi, K. and Rahmatnejad, E. (2011) Estimation of genetic and environmental parameters affected pre-weaning traits of Arabi lambs. J. Anim. Vet. Sci., 10: 1239-1243.
19. Borhan, S.H. and Masoud, Z. (2012) Estimation of genetic parameters for body weights of Kurdish sheep in various ages using multivariate animal models. Afr. J. Biotechnol., 11: 2119-2123. [Crossref]
20. Zishiri, O.T., Cloete, S.W.P., Olivier, J.J. and Dzama, K. (2014) Genetic parameters for live weight traits in South African terminal sire sheep breeds. Small Rum. Res., 116: 118-125. [Crossref]
21. Mishra, A.K., Arora, A.L., Prince, L.L.L., Kumar, S. and Gowane, G.R. (2009) Genetic analysis of performance traits of Malpura sheep. Indian Vet. J., 86: 484-486.
22. Abbasi, M.A., Abdollahi-Arpanahi, R., Maghsoudi, A., Vaez, T.R. and Nejati-Javaremi, A. (2012) Evaluation of models for estimation of genetic parameters and maternal effects for early growth traits of Iranian Baluchi sheep. Small Rum. Res., 104: 62-69. [Crossref]
23. Mokhtari, M.S., Moradi, S.M., Moradi, S.H. and Sadeghi, M. (2013) Estimation of (co) variance components and genetic parameters for growth traits in Arman sheep. J. Livest. Sci. Technol., 1: 35-43.
24. Mokhtari, M.S. and Rashidi, A. (2010) Genetic trends estimation for body weight of Kermani sheep at different ages using multivariate animal models. Small Rum. Res., 88: 23-26. [Crossref]25. Mohammadi, H. and Sadeghi, M. (2011) Estimates of genetic and phenotypic trends for body weight traits of Zel sheep obtained by univariate and multivariate animal model analysis. J. Anim. Sci., 89: 531-532.