Articles | Volume 68, issue 1
https://doi.org/10.5194/aab-68-151-2025
https://doi.org/10.5194/aab-68-151-2025
Original study
 | 
19 Feb 2025
Original study |  | 19 Feb 2025

Effect of social rank in hair rams on the number of lambs sired and their postnatal development

Estela Garza-Brenner, Fernando Sánchez-Dávila, Javier Hernández-Melendez, Keyla Mauleon-Tolentino, Rogelio Alejandro Ledezma-Torres, Marisol González-Delgado, Carlos Luna-Palomera, Cecilia C. Zapata-Campos, and José Fernando Vazquez-Armijo

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Cited articles

Aguirre, V., Orihuela, A., and Vazquez, R.: Seasonal variations in sexual behavior, testosterone, testicular size and semen characteristics, as affected by social dominance, of tropical hair rams (Ovis aries), Anim. Sci. J., 78, 417–423, https://doi.org/10.1111/j.1740-0929.2007.00456.x, 2007. 
Al-Atiyat, R. M.: The power of 28 microsatellite markers for parentage testing in sheep, Electron. J. Biotech., 18, 116–121, https://doi.org/10.1016/j.ejbt.2015.01.001, 2015. 
Alexander, B. M., Cockett, N. E., Burton, D. J., Hadfield, T. L., and Moss, G. E.: Reproductive performance of rams in three producer range flocks: Evidence of poor sexual behavior in the field, Small Ruminant Res., 107, 117–120, https://doi.org/10.1016/j.smallrumres.2012.04.003, 2012. 
Arista, M. A.: Determination and comparison of the fertilization capacity in the production of embryos in vitro of two homozygous cattle of the Aberdeen Angus breed in the Amazon region, Universidad Nacional Toribio Rodríguez de Mendoza De Amazonas (online), Bachelor's Thesis, Chachapoyas, Perú, Universidad Nacional Toribio Rodríguez de Mendoza de Amazonas, 43 pp., 2019. 
Bench, C. J., Price, E. O., Dally, M. R., and Borgwardt, R. E.: Artificial selection of rams for sexual performance and its effect on the sexual behavior and fecundity of male and female progeny, Appl. Anim. Behav. Sci., 72, 41–50, https://doi.org/10.1016/S0168-1591(00)00191-X, 2001. 
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Short summary
The aim of this study was to test the effect of social rank in hair rams on paternity and the postnatal development of lambs born in a semi-desert environment in northeastern Mexico. In this study, the dominant rams sired a higher percentage of lambs than the subordinate rams. The subordinate rams develop opportunistic strategies, allowing them to sire up to 32 % of lambs depending on their mating ability. Lambs sired by dominant rams had higher birth weights. 
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