Estimation of the autosomal and sex-linked genetic parameters for growth rate and efficiency-related traits in Moghani sheep

Document Type : Original Research Article (Regular Paper)


1 Payame Noor University

2 Kerman Agricultural and Natural Resources Research and Education Center, AREEO, Kerman, Iran

3 Faculty of Animal Science, Hamedan university

4 Department of Animal Science, Faculty of Agriculture, University of Jiroft, Jiroft, Iran


In the present study data on growth traits of Moghani sheep breed, collected during 1988 to 2011 at Jafarabad breeding station, were used. The studied traits were average daily gain from birth to weaning (ADG1), average daily gain from weaning to six months of age (ADG2), average daily gain from six months of age to yearling age (ADG3), Kleiber ratio from birth to weaning (KR1), Kleiber ratio from weaning to six months of age (KR2), Kleiber ratio from six months of age to yearling age (KR3), growth efficiency from birth to weaning (GE1), growth efficiency from weaning to six months of age (GE2), and growth efficiency from six months of age to yearling age (GE3). Genetic and phenotypic parameters were estimated for autosomal and sex-linked components of the studied traits under animal model. Direct autosomal heritability estimates for ADG1, ADG2, ADG3, KR1, KR2, KR3, GE1, GE2 and GE3 were 0.09±0.01, 0.07±0.02, 0.03±0.01, 0.13±0.02, 0.09±0.02, 0.02±0.01, 0.07±0.01, 0.06±0.01 and 0.02±0.01, respectively. Pre-weaning studied traits were not influenced by sex-linked additive genetic components. Sex-linked heritability estimates for ADG2, KR2, GE2, ADG3, KR3 and GE3 were 0.04±0.01, 0.02±0.01, 0.02±0.01, 0.02±0.01, 0.02±0.01 and 0.03±0.01, respectively. Autosomal additive genetic correlations between the traits were ranged from -0.68±0.22 for ADG3-KR1 and ADG1-GE2 to 0.99±0.01 for KR3-GE3. Sex-linked additive genetic correlations among the traits were positive and varied from 0.14±0.02 for GE2-ADG3 to 0.98±0.01 for ADG3-KR3 and KR3-GE3. Results revealed that when sex-linked effects are important, genetic analysis using an animal model which accounts for both autosomal and sex-chromosome inheritance provides more accurate estimates of variance components of the studied post-weaning traits.


Main Subjects

Abegaz, S., van Wyk, J.B. and  Olivier, J.J., 2005. Model comparisons and genetic and environmental parameter estimates of growth and the Kleiber ratio in Horro sheep. South African Journal of Animal Science 35, 30-40.
Akaike, H., 1974. A new look at the statistical model identification. IEEE Trans. Automative Control 19, 716-723.
Boujenane, I., Kansari, J., 2002. Estimates of (co)variances due to direct and maternal effects for body weights in Timahdite sheep. Animal Science 74, 409-414.
Dass, G., Sing, V.K., Ayub, M., 2004. Growth performance of Magra sheep under hotarid climate. Indian Journal of Animal Science 74, 441-443.
Ghafouri-Kesbi, F., Abbasi, M.A., 2019. Autosomal and X-linked additive genetic effects on body weight, body measurements and efficiency-related traits in sheep. Small Ruminant Research 180, 21-26.
Ghafouri-Kesbi, F., Gholizadeh, M., 2017. Genetic and phenotypic aspects of growth rate and efficiency-related traits in sheep. Small Ruminant Research 149, 181-187.
Gholizadeh, M., Ghafouri-Kesbi, F., 2015. Estimation of genetic parameters for growth-related traits and evaluating the results of a 27-year selection program in Baluchi sheep. Small Ruminant Research 130, 8-14.
Grossman, M., Eisen, E.J., 1989. Inbreeding, coancestry and covariance between relatives for X-chromosomal loci. Journal of Heredity 80,137-142.
Jafaroghli, M., Rashidi, A., Mokhtari, M.S., Shadparvar, A.A., 2010. (Co)Variance components and genetic parameter estimates for growth traits in Moghani sheep. Small Ruminant Research 91, 170-177.
Kariuki, C.M., Ilatsia, E.D., Kosgey, I.S., Kahi, A.K., 2010. Direct and maternal (co)variance components, genetic parameters and annual trends for growth traits of Dorper sheep in semi-arid Kenya. Tropical Animal Health and Production 42, 473-481.
Kosgey, I.S., Okeyo, A.M., 2007. Genetic improvement of small ruminants in low-input smallholder production systems: technical and infrastructural issues. Small Ruminant Research 70, 76-88.
Lasslo, L.L., Bradford, G.E., Torell, D.T., Kennedy, B.W., 1985. Selection for weaning weight in Targhee sheep in 2 environments. II. Correlated effects. Journal of Animal Science 61, 387-397.
Mandal, A., Karunakaran, M., Sharma, D.K., Baneh, H., Rout, P.K., 2015. Variance components and genetic parameters of growth traits andKleiber ratio in Muzaffarnagari sheep. Small Ruminant Research 132, 79-85.
Maraveni, M., Vatankhah, M., Eydivandi, S., 2018.  Phenotypic and genetic analysis of Lori-Bakhtiari lamb's weight at different ages for autosomal and sex-linked genetic effects. Iranian Journal of Applied Animal Science 8, 67-75.
Meyer, K. 2013. WOMBAT- A Program for Mixed Model Analyses by Restricted Maximum Likelihood. User Notes, Animal Genetics and Breeding Unit, Armidale, Australia.
Mohammadi, A., Latifi, M., 2020. Autosomal and sex-linked (co)variance components and genetic parameters for growth traits of Iranian Zandi sheep. Tropical Animal Health and Production 52, 1023-1032.
Mokhtari, M.S., Razmkabir, M., Ghiasi, H., Mohammadi, Y., 2019. Genetic evaluation of growth rate and efficiency related traits in Raeini Cashmere goat. Iranian Journal of Applied Animal Science 9, 275-282.
Rance, K.A., Heath, S.C., Keightley, P.D., 1997. Mapping quantitative trait loci for body weight on the X chromosome in mice. II. Analysis of congenic backcrosses. Genetics Research 70, 125-133.
Rashidi, A., Sheikhahmadi, M., Rostamzadeh, J., Shrestha, J.N.B., 2008. Genetic parameter estimates of body weight at different ages and yearling fleece weight in Markhoz goats. Asian-Australasian Journal of Animal Sciences 21, 1395-1403.
Ross, M.T., Grafham, D.V., Coffey, A.J., Scherer, S., McLay, K., Muzny, D., Platzer, M., Howell, G.R., Burrows, C., Bird, C.P., Frankish, A., Lovell, F.L., 2005. The DNA sequence of the human X chromosome. Nature 434, 325-337.
Sefidbakht, N., 2011. Future aspect of sustainable animal production in Iran, focusing on the sheep and goat. Proceedings of the 1st Seminar on Animal Production in Tropical Environment, Shahid Bahonar University of Kerman, Kerman, Iran.
Singh, H., Pannu, U., Narula, H.K., Chopra, A., Naharwara, V., Bhakar, S.K., 2016. Estimates of (co)variance components and genetic parameters of growth traits in Marwari sheep. Journal of Applied Animal Research 44, 27-35.
Tosh, J.J., Kemp, R.A., 1994. Estimation of variance components for lamb weights in three sheep populations. Journal of Animal Science 72, 1184-1190.
VanRaden, P.M., 1987. Evaluations of sires based on sons and on maternal grandsons. Journal of Dairy Science 70 (Suppl. 1):185. (Abstr.)
Zishiri, O.T., Cloete, S.W.P., Olivier, J.J., Dzama, K., 2013. Genetic parameters for growth, reproduction and fitness traits in the South African Dorper sheep breed. Small Ruminant Research 112, 39-48.
Zung, A., Phillip, M., Chalew, S.A., Palese, T., Kowarski, A.A., Zadik, Z., 1999.Testosterone effect on growth and growth mediators of the GH-IGF-I axis inthe liver and epiphyseal growth plate of juvenile rats. Journal of Molecular Endocrinology 23,209- 221.