Estimation of Individual Heterosis for Lamb Growth in Ghezal and Mehraban Sheep

Document Type: Research Articles


Department of Animal Science, Shiraz University, Shiraz, Iran


Data on 361 lambs of Mehraban (n=90), Ghezel (n=92), Ghezel × Mehraban (n=87), and Mehraban × Ghezel (n=92, sire breed listed first) were used to estimate individual Heterosisfor lamb growth. The obtained results demonstrated that lambs of purebreds of Ghezel and Mehraban showed the highest and the lowest birth weight, respectively (P<0.05). Crossbred lambs of Mehraban × Ghezel showed significantly higher (P<0.05) average birth weight per ewe than Ghezel × Mehraban. Purebred Mehraban lambs showed the lowest total and average six month old weight per ewe (P<0.05) but the average and total six month old weight per ewe of Ghezel was not different than crossbreds groups of Ghezel × Mehraban and Mehraban × Ghezel lambs (P≥0.05). Individual heterosis for the average birth weight, total birth weight, average six month old weight and total six month old weight was estimated to be -0.37, -0.30, 0.22 and -1.03%, respectively (P≥0.05).


BathaeuS.S. (1994). Genetic parameters for pre-weaning growth traits of Mehraban Iranian fat-tailed sheep. World. Rev. Anim. Prod.29, 61-65.
Dixit S.P., Dhilon J.S. and Sing G. (2001). Genetic and non-genetic parameter estimates for growth traits of Bharat Merino lambs. Small Rumin. Res. 42, 101-104.
Farid A. (1991). Slaughter and carcass characteristics of three fat-tailed sheep breeds and their crosses with Corriedale and Targhee rams. Small Rumin. Res. 5, 255-271.
Gamasaee V.A., Hafezian S.H., Ahmadi A., Baneh H., Farhadi A. and Mohamadi A. (2010). Estimation of genetic parameters for body weight at different ages in Mehraban sheep. African J. Biotechnol. 32, 5218-5223.
Kalantar M. (2003). Evalution of some environmental effect on growth traits in Zandi sheep. Agric. Res. 4, 49-58.
Long T.E. and Thomas D.L. (1989). Estimation of individual and maternal heterosis, pepeatability and heritability for ewe productivity and its components in Suffolkand Targhee sheep. J. Anita.Sci. 67, 1208-1217.
Makarechian M., Farid A. and Sefidbakht N. (1977). Lamb growth performance of Iranian fat-tailed Karakul, Mehraban and Naeini breeds of sheep and their crosses with Corriedale and Targhee rams. Anim. Prod. 25, 331-341.
Notter G. (1978). Breed utilization for meat production in sheep. Anim. Breed. Abstr. 46, 131-143.
Rastogi R., Boylan W.J., Rempel W.E. and Windels H.F. (1982). Crossbreeding in sheep with evaluation of combining ability, heterosis and recombination effects for lamb growth. J. Anim. Sci. 54, 524-532.
Rashidi A., Mokhtari M.S., SafiJahanshahi A. and Mohammad Abadi M.R. (2008). Genetic parameter estimates of pre-weaning growth traits in Kermani sheep. Small Rumin. Res. 74, 165-171.
Sandelin B.A., Brown Jr A.H., Brown M.A., Johnson Z.B., Kellogg D.W. and Stelzleni A.M. (2002). Genotype × environmental interaction for mature size and rate of maturingfor Angus, Brahman, and reciprocal-cross cows grazing bermudagrassor endophyte infected fescue. J. Anim. Sci. 80, 3073-3076.
SAS. (1990). SAS User‘s Guide: SAS. Inst. Inc., Cary. NC.
Taleghani H., Bennett J.A. and Riggs B.L. (1975). Growth rate of fat tail and exotic cross lambs. Anim. Sci. 41, 283.
Vatankhah M., Moradi-Sharebabak M., Nejati-Javaremi A., Miraei-Ashtiani S.R. and Vaez-Torshizi R. (2004). A review of sheep breeding in Iran. Pp. 591-597 in Proc. 1st Congress on Animal and Aquatic Science, Faculty of Agriculture and Natural Resources, The University of Tehran, Karaj, Iran.
Willham R.L. and Pollak E. (1985). Theory of heterosis. J. Dairy Sci. 68, 2411-2417.
Zamiri M.J. and Izadifard J. (1997). Relationships of fat-tail weight with fat-tail dimensions and carcass characteristics in two fat-tail breeds of sheep. Small Rumin. Res. 26, 261-266.