Estimation of genetic parameters for sexual dimorphism in body weight of Baluchi sheep

Document Type : Research Article (Regular Paper)

Authors

1 Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Department of Animal Science, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran

3 Department of Animal Science, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Abstract

The objective of this study was to estimate genetic parameters for sexual dimorphism (SD) in birth weights (BW), weaning weights (WW), 6-month weight (W6), 9-month weight (W9) and 12-month weight (W12) of Baluchi sheep. Data were collected during 1981-2015 from Baluchi sheep flock (flock no 1) of Abbas Abad sheep breeding station located in Mashhad, Iran. Data were included 7339, 7303, 5884, 5162 and 4691 records of birth weight, weaning weight, 6-month weight, 9-month weight and 12-month weight, respectively. Six bivariate animal models were used to estimate variance components and corresponding genetic parameters in male and female lambs separately. The SD levels (ratio of Male/Female) increased from 1.06 at birth to 1.13 at yearling age. Except for W9 in which additive genetic variance and direct heritability (h_a^2) were greater in males, for the other studied traits, females experienced higher additive genetic variance and h_a^2. In both sex, maternal effects contributed significantly in phenotypic variation of body weights with greater contribution to body weights measured early in life. While in females, maternal genetic effect was greater than males, in males, maternal permanent environmental effect was greater which together with higher estimates of residual variances revealed greater sensitivity of male lambs to environmental conditions. Cross-sex additive genetic correlation (ra) was 0.86 for BW and 1.00 for the other studied traits. Maternal correlations between sexes were close to 1.00 indicating lack of sexual dimorphism for maternal effects on body weights of Baluchi lambs. Based on an approximate 95% confidence interval, the difference between sexes regarding direct heritability were not significant, indicating no need or opportunity for different selection strategies in two sexes. Therefore, a model including lambs of both sexes and with sex effects included in the model can be used for genetic evaluation.

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References

References

Akaike, H., 1974. A new look at the statistical model identification. Transactions on Automatic Control 19, 716-723.

Badyaev, A.V., 2002. Male and female growth in sexually dimorphic species: harmony, conflict, or both? Comments on Theoretical Biology 7, 11–33.
Bahreini-Behzadi, M.R., Aslaminejad, A., Sharifi, A.R., Simianer, H., 2014. Comparison of mathematical models for describing the growth of Baluchi sheep. Journal of Agricultural Science and Technology 14, 57-68.
Cunningham, F., K, Leveno, S, Bloom., J, Hauth., D., Rouse., Spong, C., 2010. William’s Obstetrics. 23rd Edition, McGraw-Hill, New York, USA.
Darwin, C., 1871. The descent of man, and selection in relation to sex. Murray, London, UK.
Ghafouri-Kesbi, F., Baneh, H., 2018. Genetic aspects of sexual size dimorphism in a synthesized breed of sheep. Meta Gene 17, 177-183.
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.
Ghafouri-Kesbi, F., Notter, D.R., 2016. Sex influence on genetic expression of early growth in Afshari lambs. Archiv Tierzukht 59, 9-17.
Ghafouri-Kesbi, F., Rahimi, G.H., Hafeziyan, H., Ansari, Z., Baneh, H., Solimani, B., 2015. A genetic study on sexual dimorphism of body weight in sheep. Animal Production Science 55, 101-106.

Gudex, BW., Condro C., Marshal, K., van der Werf, J.H.J., 2009. The genetics of sexual dimorphism in sheep. Proceedings of the 18th Association for the Advancement of Animal Breeding and Genetics Conference 18, 14-17.

Kamalzadeh, A., Shabani, A., 2007. Maintenance and growth requirements for energy and nitrogen of Baluchi sheep. International Journal of Agricultural Biology 4, 535-539.
Latifi, M., Mohammadi, A., 2019.  Estimation of genetic parameters of autosomal and sex-linked pre-weaning traits in Makuie sheep using multivariate analysis. Genetika 51, 365-375.
Latifi, M., Bohlouli, M., 2020. Estimation of growth curve parameters in Mehraban sheep using different non-linear models. Genetika 52, 815-823.
Lovich, J.E., Gibbons, J.W., 1992. A review of techniques for quantifying sexual size dimorphism. Growth, Development and Aging 56, 269-281.
Maniatis, G., Demiris, N., Kranis, A.,  Banos, G., Kominakis, A., 2013. Genetic analysis of sexual dimorphism of body weight in broilers. Journal of Applied Genetics 54, 61-70.
Mateescu, R.G., Thonney, M.L., 2002. Gene expression in sexually dimorphic muscles in sheep. Journal of Animal Science 80, 1879-1887.
McLean, C., Garwood R.J., Brassey, C.A., 2018. Sexual dimorphism in the Arachnid orders. Peer Journal 6, 5751.
Mallon, J.C., 2017. Recognizing sexual dimorphism in the fossil record: lessons from non-avian dinosaurs. Paleobiology 43, 495-507.
Maraveni, M., Vatnkhah, 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 Research 8, 67-75.
Meyer, K., 2007. WOMBAT: a program for mixed model analyses by restricted maximum likelihood. User notes.
Mignon-Grasteau, S., Piles, M., Varona, L., De Rochambeau, H., Poivey, J., Blasco, A., Beaumont, C., 2000. Genetic analysis of growth curve parameters for male and female chickens resulting from selection on shape of growth curve. Journal of Animal Science 78, 2515-2524.
Polak, J., Frynta, D., 2009. Sexual size dimorphism in domestic goats, sheep, and their wild relatives. Biological Journal of the Linnaean Society 98, 872-883.
Parés-Casanova, P.M., 2015. Discrete sexual size dimorphism in domestic sheep. Annals of Biology Research 6, 43-48.
Poissant, J., Wilson, A. J., Coltman, D.W., 2010. Sex-specific genetic variance and the evolution of sexual dimorphism: A systematic review of cross-sex genetic correlation. Evolution 64, 97-107.
Poissant, J.M., Wilson, AJ., Festa-Bianchet, M., Hogg, J.T., Coltman, D.W., 2008.  Quantitative genetics and sex-specific selection on sexually dimorphic traits in bighorn sheep. Proceedings of the Royal Society B: Biological Sciences 275, 623-628.
Rensch, B., 1950. Die Abhängigkeit der relativen Sexualdifferenz von der Körpergröße. Bonner zoologische Beiträge 1, 58-69.
 Riggio, V., Finocchiaro, R., Bishop, S.C., 2008. Genetic parameters for early lambs survival and growth in Scottish Blackface sheep. Journal of Animal Science 86, 1758-1764.
Safari, E., Fogarty, N.M., Gilmour, A.R., 2005. A review of genetic parameter estimates for wool, growth, meat and reproduction traits in sheep. Livestock Production Science 92, 271-289.
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.
van der Heide, E. M. M., Lourenco, D. A. L., Chen, C. Y., Herring, W. O., Sapp, R. L., Moser, D. W., Tsuruta, S., Masuda, Y., Ducro, B. J., Misztal, I., 2016. Sexual dimorphism in livestock species selected for economically important traits. Journal of Animal Science 94, 3684-3692.
 
Journal of Livestock Science and Technologies
Volume 9, Issue 1
June 2021
Pages 61-68

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