Ram mating preferences for woolly rather than recently shorn ewes

Tilbrook, Alan John; Cameron, A. W. N.

doi:10.1016/0168-1591(89)90058-0

Cited by 14 publications

(10 citation statements)

References 17 publications

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“…Saint Croix rams displayed a more intense sexual activity than Suffolk rams, even though they were exposed to females from a different breed. According to Tilbrook and Cameron (1989), if rams have a choice they will prefer to mount ewes from their own breed. However, if they have no choice, they could end up mounting females from different breed, as reported in this study.…”

Section: Resultsmentioning

confidence: 99%

Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

et al. 2013

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Section: Resultsmentioning

confidence: 99%

Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

et al. 2013

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“…Sin embargo, la preferencia por ovejas con lana sólo se ha observado en condiciones extensivas y no en corral (122) .…”

Section: Male Effectunclassified

“…However, the preference for sheep wool has only been observed in extensive conditions and not in pens (122) .…”

Section: Selection Of Sexual Companionmentioning

confidence: 99%

La conducta sexual del carnero. Revisión

Trujillo

2014

RMCP

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RESUMENEl 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.PALABRAS CLAVE: Comportamiento reproductivo, Ovinos, Reproducción, Libido, Capacidad de servicio. ABSTRACTThe 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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“…Olfactory cues, in particular, play a key role. For example, rams prefer and are more sexually stimulated by ewes that have not been shorn, and it has been suggested that some components of the sexual "attractiveness" of the ewe, such as olfactory cues, are associated with her wool (Tilbrook 1987b, Tilbrook & Cameron 1989. It is possible that stress reduces olfactory stimuli provided by ewes to rams, or interferes with the central processing of that information (Pierce et al 2008, Pierce et al 2009a, Papargiris et al 2011b.…”

Section: Role Of Cortisol In Influencing the Impact Of Stress On Sexumentioning

confidence: 99%

“…Although these characteristics and their temporal changes apply to all healthy female livestock, there are individual differences between females in expression and levels of sexual behaviours that make this a challenging area to research. A clear example is individual differences in sexual "attractiveness" of ewes that influence their chances of being successfully mated (Tilbrook 1987a,b, Tilbrook & Lindsay 1987, Tilbrook & Cameron 1989 and there are also likely to be differences among individuals in other aspects of sexual behaviour. There is an endocrine basis for the control of attractivity, proceptivity and receptivity with oestradiol playing an essential role in most species.…”

Section: Role Of Cortisol In Influencing the Impact Of Stress On Sexumentioning

confidence: 99%

Impact of psychosocial stress on gonadotrophins and sexual behaviour in females: role for cortisol?

et al. 2016

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This review focuses on the importance of cortisol in mediating the inhibitory effects of psychosocial stress on reproduction in females. In particular, we have summarized our research in sheep where we have systematically established whether cortisol is both sufficient and necessary to suppress reproductive hormone secretion and inhibit sexual behaviour. Our findings are put into context with previous work and are used to develop important concepts as well as to identify productive further lines of investigation. It is clear that cortisol is necessary to inhibit some, but not all, aspects of reproduction in female sheep. These actions vary with reproductive state, and there are important interactions with gonadal steroids. The impact of cortisol on the tonic secretion of gonadotrophin-releasing hormone and luteinizing hormone has been investigated extensively, but less is known about the surge secretion of these hormones and their effects on sexual behaviour. Furthermore, there are separate effects of cortisol in the brain (hypothalamus) and at the anterior pituitary, illustrating that there are different mechanisms of action. Thus, although cortisol is important in mediating some of the effects of stress on reproduction, we need to look beyond cortisol and investigate some of the other mechanisms and mediators that relay the effects of stress on reproduction. In this regard, we propose that a group of neurons in the hypothalamus that co-synthesize kisspeptin, neurokinin B and dynorphin, termed KNDy cells, play important roles in mediating the effects of cortisol on reproduction. This hypothesis needs to be rigorously tested.Reproduction (2016) 152 R1-R14

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Ram mating preferences for woolly rather than recently shorn ewes

Cited by 14 publications

References 17 publications

Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

Reproductive behaviour of Saint Croix and Suffolk rams at medium latitudes (19º N) during long days while being exposed to Suffolk ewes in seasonal anestrus

La conducta sexual del carnero. Revisión

Impact of psychosocial stress on gonadotrophins and sexual behaviour in females: role for cortisol?

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