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

Clemente, Neftalí; Orihuela, Agustı́n; Flores-Pérez, Iván; Aguirre,; Valencia, Javier

doi:10.4067/s0301-732x2013000100011

Cited by 3 publications

(10 citation statements)

References 19 publications

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“…Clemente et al (149) found that Santa Cruz rams induced oestrus, conception and pregnancy in Suffolk anestric ewes while Suffolk rams only caused silent ovulations in ewes of their same breed (at 19° N). This is explained at least in part, due to the difference in the magnitude of courtship behavior emitted by both breeds during the long days season (52) .…”

Section: Male Effectmentioning

confidence: 98%

“…In extensive conditions, some researchers have found a diurnal pattern in sexual behavior, noting that most of the copulations occur in peaks, early in the morning and late in the afternoon, with little activity at night and almost zero between 2300 and 0300 h (49,50) . In addition to the time of day, other factors involved are high ambient temperatures and severe weight loss, as agents that suppress sexual activity (51) .…”

Section: La Cópulamentioning

confidence: 99%

“…In addition to the time of day, other factors involved are high ambient temperatures and severe weight loss, as agents that suppress sexual activity (51) . Breeds originating in temperate climates are more affected than those of tropical origin during hours of intense radiation (52) .…”

Section: La Cópulamentioning

confidence: 99%

“…En condiciones extensivas, algunos investigadores han encontrado un patrón diurno en el comportamiento sexual, observando que la mayoría de las cópulas suceden en picos, temprano por la mañana y tarde por la tarde, con poca actividad nocturna y casi nula entre las 23:00 y las 03:00 horas (49,50) . Además de la hora del día, otros factores involucrados son; altas temperaturas ambientales y severas pérdidas de peso, como agentes que deprimen la actividad sexual (51) .…”

Section: La Cópulaunclassified

“…Además de la hora del día, otros factores involucrados son; altas temperaturas ambientales y severas pérdidas de peso, como agentes que deprimen la actividad sexual (51) . Las razas originarias de climas templados se ven más afectadas que las de origen tropical durante las horas de intensa radiación (52) .…”

Section: La Cópulaunclassified

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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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Section: Male Effectmentioning

confidence: 98%

Section: La Cópulamentioning

confidence: 99%

Section: La Cópulamentioning

confidence: 99%

Section: La Cópulaunclassified

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La conducta sexual del carnero. Revisión

Trujillo

2014

RMCP

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Effect of pre-pubertal growth rate of Sohagi ram lambs on some physiological parameters and sexual behavioral patterns at puberty

2021

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Thirty healthy Sohagi ram lambs with an average age of 188.6±7.3 days were used to study the effect of pre-pubertal growth rate on some physiological parameters and sexual behavioral patterns at puberty. Ram lambs were divided into three groups (10 animals per each group) according to the previous growth rate until 6 months of age. Groups were marked as fast, medium and slow growing. Animal groups were housed in closed barns with access to an open area. Results showed that age and weight of ram lambs at puberty were significantly affected (P<0.05) by the pre-pubertal growth rate. Ram lambs in the fast growing group were reached to onset puberty firstly at 272.6 days with body weight (BW) 37.1 kg on average then ram lambs in medium group (284.8 days with BW 32.7 kg), while ram lambs in slow growing group were the last (314.1 days with BW 32.5 kg). Blood‎ testosterone‎ concentration at puberty was not significantly different among growing groups (1.494± 0.03 ng/ml on average, ranged from 1.287 to 1.902 ng/ml). Testes measurements from 6 months of age until puberty show that ram lambs in fast growing group had the highest values of testes length, circumference and volume followed by those in medium and slow growing group. Sexual behavioral observation showed that flehmen and mounting behavior were significantly higher for ram lambs in fast growing group (5.63 and 6.75 number/12h) than slow growing group (4.25 and 5.38 number/12h) while in medium growing group were intermediate (4.88 and 5.88 number/12h). From these findings, could be concluded that age, weight and sexual behavioral patterns of Sohagi ram lambs at puberty were affected by pre-pubertal growth rate, and the breeders should strive to achieve good growth rates for their lambs before puberty which led to improving reproductive performance.

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A study on the effect of age, breed and season on sexual behaviour, testosterone concentrations and scrotal circumference in Egyptian rams

Mostafa

Farghal

2019

Journal of Veterinary Medical Research

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The objective of this study was to detect the influence of age, breed and season on sexual behaviour, testosterone concentrations and scrotal circumference in Egyptian rams. The study was carried out at agricultural research center belonging to Minia University, Shosha village, Samalut city, El-Minia. Ten crossbred and five adult Ossimi rams were used during this study. Every ram was allowed to breed two ewes to evaluate its sexual behaviour for a twenty minutes test. Blood samples were collected three times per season at two weeks interval from each ram during the period of experiment to measure testosterone concentrations. Also, scrotal circumference was measured at the same frequency and time interval as blood samples. Sexual behaviour was better in old rams than young ones (p<0.01), but it was not affected by breed or season (p>0.05). Serum testosterone level was higher at autumn (7.13±02.9 ng/ml) than at winter (5.54±0.29 ng/ml) in crossbred rams (p<0.01), while in Ossimi rams, higher level was obtained in spring (8.24±.39 ng/ml) than in summer (3.99±0.40 ng/ml). Mean scrotal circumference was higher in older rams (30.20±1.20 cm) than younger rams (22.53±1.27 cm). There was no significant difference for measures of scrotal circumference between crossbred rams (30.86±1.09 cm) and Ossimi rams (30.93±1.06 cm). Season had no significant effect on scrotal circumference in crossbred rams, whereas in Ossimi rams the effect of season was significantly obvious with the highest and lowest values were recorded in spring (31.0±1.05 cm) and winter (30.60±1.17 cm) respectively. It could be concluded from this study that the age of rams had a great influence on their sexual behaviour and scrotal circumference, while the effect of breed and season on sexual behaviour and scrotal circumference was not clear.

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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

Cited by 3 publications

References 19 publications

La conducta sexual del carnero. Revisión

La conducta sexual del carnero. Revisión

Effect of pre-pubertal growth rate of Sohagi ram lambs on some physiological parameters and sexual behavioral patterns at puberty

A study on the effect of age, breed and season on sexual behaviour, testosterone concentrations and scrotal circumference in Egyptian rams

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