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      La conducta sexual del carnero: Revisión Translated title: Ram's sexual behavior: Review

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          Abstract

          El presente trabajo tiene como objetivo recapitular la literatura disponible sobre factores que influyen en la conducta sexual del carnero. Incluye una descripción de los fundamentos endocrinos básicos, su manifestación en borregos ferales, así como una breve reseña de las conductas de cortejo y cópula. También abarca una descripción de aquellos efectos que tanto a nivel prenatal como durante la infancia pueden afectar la vida reproductiva del animal adulto, considerando prácticas de manejo tales como la separación por sexos al momento del destete, y los problemas posteriores de homosexualidad o inadecuda conducta sexual que pueden mostrar en su madurez. Además, se revisan aspectos de dominacia y fotoperiodo, y cómo estos pueden afectar el éxito reproductivo. Se describen aspectos relacionados con la selección del compañero de monta y colección del semen. Finalmente, se documentan algunas pruebas a corral, desarrolladas con el fin de determinar cuáles son los carneros que pueden tener mayor éxito reproductivo en condiciones de campo.

          Translated abstract

          The purpose of this manuscript is to summarize the literature regarding factors influencing rams' sexual behavior. It includes a description of: the fundamental endocrine basis of sexual behavior, its manifestation in feral sheep, a brief description of ram's courting, and copulatory behaviors. It also describes how some prenatal and childhood conditions can impact reproductive performance in mature animals, in addition to management practices, such as separation by sexes at weaning, and the later problems of homosexuality or inadequate sexual behavior that might some rams develope. Furthermore, the effects of dominance and photoperiod, and their effect in the reproductive success, together with some aspects related to mate selection are also described. Some considerations during semen collection are stated as well, and finally, several useful tests that have been developed under pen conditions to determine which rams could be successful breeders in the field are illustrated.

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          Most cited references 271

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          Dominant rams lose out by sperm depletion.

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            Overt and covert competition in a promiscuous mammal: the importance of weaponry and testes size to male reproductive success.

            Male contests for access to receptive females are thought to have selected for the larger male body size and conspicuous weaponry frequently observed in mammalian species. However, when females copulate with multiple males within an oestrus, male reproductive success is a function of both pre- and postcopulatory strategies. The relative importance of these overt and covert forms of sexual competition has rarely been assessed in wild populations. The Soay sheep mating system is characterized by male contests for mating opportunities and high female promiscuity. We find that greater horn length, body size and good condition each independently influence a male's ability to monopolize receptive females. For males with large horns at least, this behavioural success translates into greater siring success. Consistent with sperm-competition theory, we also find that larger testes are independently associated with both higher copulation rates and increased siring success. This advantage of larger testes emerges, and strengthens, as the number of oestrous females increases, as dominant males can no longer control access to them all. Our results thus provide direct quantitative evidence that male reproductive success in wild populations of mammals is dependent upon the relative magnitude of both overt contest competition and covert sperm competition.
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              SEXUAL SEGREGATION IN UNGULATES: A NEW APPROACH

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                Author and article information

                Journal
                rmcp
                Revista mexicana de ciencias pecuarias
                Rev. mex. de cienc. pecuarias
                Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias (Mérida, Yucatán, Mexico )
                2007-1124
                2448-6698
                March 2014
                : 5
                : 1
                : 49-89
                Affiliations
                Cuernavaca Morelos orgnameUniversidad Autónoma del Estado de Morelos orgdiv1Facultad de Ciencias Agropecuarias México aorihuela@ 123456uaem.mx
                Article
                S2007-11242014000100004 S2007-1124(14)00500100004

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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                Figures: 0, Tables: 0, Equations: 0, References: 184, Pages: 41
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                Revisión bibliográfica

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