Different models for genetic evaluation of growth rate and efficiency-related traits in Iran-Black sheep

Document Type : Original Research Article (Regular Paper)

Authors

1 Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Karaj, Iran.

2 Animal Science Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO)

3 Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Iran

Abstract

Abstract
Six univariate animal models, including various combinations of the maternal effects, were used to estimate the (co)variance components and genetic parameters for growth rates from birth to weaning (GR1), weaning to six months of age (GR2) and weaning to 12 months of age (GR3), and the corresponding Kleiber ratios (KR1, KR2, KR3), efficiencies of growth (EF1, EF2, EF3) and relative growth rates (RGR1, RGR2, RGR3) in Iran-Black sheep. The most appropriate model for each trait was identified by the Akaike Information Criterion (AIC). In addition, bivariate analyses were used to estimate the (co)variance components between traits. Estimated values of the direct heritability (±S.E.) were 0.08±0.03, 0.07±0.03 and 0.05±0.03 for GR1, GR2, and GR3; 0.25±0.07, 0.05±0.02, and 0.01±0.01 for KR1, KR2 and KR3; 0.05±0.03, 0.04±0.02 and 0.00±0.01 for EF1, EF2 and EF3; and 0.09±0.04, 0.05±0.02 and 0.00±0.01 for RGR1, RGR2 and RGR3, respectively. There was little additive genetic variation in growth rate and efficiency-related traits in Iran-Black sheep and therefore, a small genetic progress would be expected through selection. All the studied traits were affected by maternal effects. Estimates of the maternal heritability (m2) ranged from 0.02 (GR3) to 0.13 (EF1) and estimates of the ratio of maternal permanent environmental variance to phenotypic variance (c2) ranged from 0.03 (GR2, GR3, KR2) to 0.09 (GR1, EF3). Genetic correlations between the studied traits varied from -0.63 (KR1 and EF3) to 0.99 (KR2 and EF3), and the phenotypic correlations ranged from -0.65 (GR1 and EF3) to 0.98 (EF2 and RGR2 and EF3 and RGR3). The study also showed the importance of inclusion of efficiency-related traits in selection programs to improve the biological characteristics of Iran-Black sheep. 

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References

References
Ahmadpanah, J., Baneh, H., Kohnepoushi, C., 2016. Direct and maternal genetic trend estimates for body weight traits of Iran-Black Sheep using multivariate animal models. Songklanakarin Journal of Science and Technology 38, 305-310.
Akaike, H., 1974. A new look at the statistical model identification. IEEE Transactions on Automatic Control 19, 716–723.
Al-Bial, A., Singh, J., Singh, D.P., Niwas, R., 2012. Environmental and genetic factors on growth traits of Black Bangal sheep in Yemen. The Bioscan 7, 185-188.
Baneh, H., Hafezian, S.H., 2009. Effects of environmental factors on growth traits in Ghezel sheep. African Journal of Biotechnology 8, 2903-2907.
Bangar, Y.C., Lawar, V.S., Nimbalkar, C.A. Shinde, OV, Nimase, R.G., 2018. Heritability estimates for average daily gain and Kleiber ratio in Deccani sheep. Indian Journal of Small Ruminants 24, 18-21.
Cheraghi, D., Gholipour, S., 2010. A review of challenges of red meat in Iran.  Commercial Surveys 41, 89-110.
Dass, G., Sing, V.K., Ayub, M., 2004. Growth performance of Magra sheep under hot arid climate. Indian Journal of Animal Science 74, 441-443.
 Emmam Jomeh Kashan, N., Manafi Azar, G.H., Afzalzadeh, A., Salehi, A., 2005. Growth performance and carcass quality of fattening lambs from fat-tailed and tailed sheep breeds. Small Ruminant Research 60, 267-271.
Eskandarinasab, M.P., Ghafouri-Kesbi, F., Abbasi, M.A., 2010. Different models for evaluation of growth traits and Kleiber ratio in an experimental flock of Iranian fat-tailed Afshari sheep. Journal of Animal Breeding and Genetics 127, 26-33.
Fitzhugh, H.A Jr., Taylor, C.S., 1971. Genetic analysis of degree of maturity. Journal of Animal Science 33, 717-725.
Ghafouri-Kesbi, F., Eskandarinasab, M., 2018. Heritability of relative growth rate and its relationship with growth-related traits in Afshari sheep. Gene Reports 12, 225-229.
Ghafouri-Kesbi, F., Gholizadeh, M., 2017. Genetic and phenotypic aspects of growth rate and efficiency-related traits in sheep. Small Ruminant Research 149, 141-187.
Ghafouri-Kesbi, F., Rafiei-Tari, A., 2015. Relative growth rate in sheep: heritability and relationship with absolute growth rate and body weight. Journal of Science and Technology 37, 21-27.
Jalil-Sarghale, A., Kholghi, M., Moradi Shahre Babak, M., Moradi Shahre Babak, H., Mohammadi, H., Abdollahi-Arpanahi, R., 2014. Model comparisons and genetic parameter estimates of growth traits in Baluchi sheep. Slovak Journal of Animal Science 47, 12-18.
Kamjoo, B., Baneh, H., Yousefi, V., Mandal, A., Rahimi, G., 2014. Genetic parameter estimates for growth traits in Iran-Black sheep. Journal of Applied Animal Research 42, 79-88.
Kleiber, M., 1947. Body size and metabolic rate. Physiological Reviews 27, 511-541.
Mahala, S., Saini, S., Kumar, A., Sharma, R.C., Gowane, G.R., 2020. Genetic trends for the growth rates and Kleiber ratio in Avikalin sheep. Small Ruminant Research 189, 06143.
Meyer, K., 2007. WOMBAT – a tool for mixed model analyses of quantitative genetics by REML. Journal of Zheijang University Science B 8, 815-821.
Mohammadi, M., Moradi Shahrebabak, M., Bahrami, A., Dorostkar, M., 2013. Model comparisons and genetic parameter estimates of growth and the Kleiber ratio in Shal sheep. Archive Tierzukht 26, 264-275.
Mokhtari, M., Moradi Shahrbabak, M., Esmailizadeh, A., Moradi Shahrbabak, M.H, Gutierrez, G.P., 2014. Pedigree analysis of Iran-Black sheep and inbreeding effects on growth and reproduction traits. Small Ruminant Research 116, 14-20.
Rashidi, A., 2013. Genetic parameter estimates of body weight traits in Iran-Black sheep. Journal of Livestock Science and Technologies 1, 50-56.
SAS. 2004. User’s Guide, version 9. SAS Institute, Cary, NC.
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.
Tortereau, F., Marie-Etancelin, C., Weisbecker, J.L., Marcon, D., Bouvier, F., Moreno-Romieux, C., François, D., 2020. Genetic parameters for feed efficiency in Romane rams and responses to single-generation selection. Animal 14, 681-687.
Journal of Livestock Science and Technologies
Volume 9, Issue 2
December 2021
Pages 67-74

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