Evaluation of sexual behavior of hair sheep rams in a tropical environment.

Godfrey, R. W.; Collins, Jeffrey R.; Gray, M L

doi:10.2527/1998.763714x

Cited by 28 publications

(28 citation statements)

References 10 publications

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“…Although differences were found in reaction time in the four breeds, the overall mean of 37.62 ± 4.89 seconds is within the reported range of 20 to 59 seconds in several sheep breeds , Kheradmand and Babaei 2006, Aguirre et al 2007 and is shorter than the average mentioned for mature hair rams (Chi et al 2009), young hair rams (Godfrey et al 1998, Lezama et al 2003, yearling Targhee rams (Price et al 1991) and for local wool breeds (Pimentel et al 2005). In relation to second and third mating, the overall mean of 136.43 ± 9.13 and 180.95 ± 11.46 seconds, respectively, is similar with the results of Chi et al (2009), but is lower than results reported in yearling Katahdin rams (Lezama et al 2003) and for local wool breeds (Pimentel et al 2005).…”

Section: Discussionmentioning

confidence: 92%

“…These behaviours are considered as libido activities that males use in order to determine the sexual receptivity of females (Price et al 1992, Ungerfeld andGonzalez 2008). These sexual behaviours are indicative of hair sheep (Godfrey et al 1998) and other breeds (Kridli et al 2007). All hair rams exhibited a full repertory of sexual behaviour throughout the three seasons.…”

Section: Discussionmentioning

confidence: 99%

“…All of these breeds apparently are well adapted to the tropical environmental conditions of high ambient temperature, humidity and rainfall, where it has been demonstrated that hair rams express adequate levels of good quality semen and sexual behavior throughout the year (Godfrey et al 1998, Aguirre et al 2007, CardenasGallegos et al 2012. Unfortunately, information about sexual performance of hair rams is scarce due to non-existent or rarely conducted sexual performance tests as a consequence of unknown or inadequate ram management by breeders.…”

Section: Introductionmentioning

confidence: 99%

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Libido and serving capacity of mature hair rams under tropical environmental conditions

et al. 2015

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RESUMENLos objetivos del presente estudio fueron evaluar la libido y la capacidad de servicio de carneros de pelo adultos Pelibuey (PB), Blackbelly (BB), Dorper (DR) y Katahdin (KA) durante las tres épocas del año en el trópico. Dos veces por época 28 carneros maduros fueron individualmente expuestos durante 10 minutos a una oveja inmovilizada e inducida al estro. Se registró el número total de las actividades de la conducta sexual, el tiempo de reacción al primer servicio, y período de latencia entre servicios. El efecto de raza influyó en el tiempo de reacción al primer servicio y los tiempos de latencia (P < 0,05), excepto el tiempo de latencia en el segundo servicio, también la época resultó significativa (P < 0,05), pero no la interacción entre raza*época (P > 0,05). Todos los carneros realizaron al menos un servicio. La media (± EE) del tiempo de reacción y las latencias entre el segundo y tercer servicio fueron 37,62 ± 4,97; 136,43 ± 9,75 y 180,95 ± 11,87 segundos, respectivamente. Los carneros PB, BB y KA fueron más rápidos que los DR en el tiempo de reacción y latencia al segundo servicio (P < 0,05). Para la latencia al tercer servicio los carneros PB y KA fueron más rápidos que BB y DR (P < 0,05). Las actividades de la libido más frecuentes fueron el olfateo anogenital y el pateo de extremidades. Se concluye que bajo condiciones de clima tropical los carneros adultos PB, KA y BB mostraron mayor capacidad de servicio que los DR, con menor tiempo de reacción y latencia al segundo servicio. Los carneros de pelo exhibieron con mayor frecuencia actividades de olfateo anogenital y pateo de extremidades.Palabras clave: libido, capacidad de servicio, carneros de pelo, trópico. SUMMARYThe objectives of the present study were to evaluate the libido and serving capacity of Pelibuey (PB), Blackbelly (BB), Dorper (DR) and Katahdin (KA) hair sheep rams in three seasons under tropical environmental conditions. Twenty-eight mature rams were individually exposed for 10 minutes to an immobilized, oestrous-induced ewe twice per season. The total number of sexual behaviours, reaction time to first mating and latencies between mating were recorded. Reaction time and latencies were affected by breed effect (P < 0.05) and except for the latency time for the second ejaculation, the season was also significant (P < 0.05) while no interaction effects were observed (P > 0.05). All rams attained at least one ejaculation during testing. The overall mean (± S.E.M.) of reaction time and latencies to second and third mating were 37.62 ± 4.97s, 136.43 ± 9.75 and 180.95 ± 11.87 seconds, respectively. PB, BB and KA rams were faster than DR in reaction time and latency to second mating (P < 0.05). For latency to third mating, PB and KA rams were faster than BB and DR (P < 0.05). The libido activities that rams performed most frequently were anogenital sniffing and foreleg kicks. It was concluded that under tropical environmental conditions PB, KA and BB rams showed better serving capacity than DR, with shorter reaction time and latency t...

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Libido and serving capacity of mature hair rams under tropical environmental conditions

et al. 2015

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“…Unlike woolled sheep that have evolved in temperate regions, hair sheep show no evidence of a photoperiodic effect on fertility at tropical latitudes (Fitzhugh and Bradford 1983). Furthermore, Godfrey et al (1998) observed that under tropical conditions, Saint Croix rams display full reproductive activity during June. This breed adaptation to photoperiod and temperature explain why Suffolk males displayed a decrease in their daily sexual activity during the mid-day hours, when there is an increase in solar radiation, unlike the more stable sexual activity of Saint Croix rams.…”

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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“…Unlike wooled sheep that have evolved in temperate regions, hair sheep show no evidence of a photoperiodic effect on fertility at tropical latitudes (Fitzhugh and Bradford 1983). Furthermore, Godfrey et al (1988) observed that, under tropical conditions, Saint Croix rams display full reproductive activity during the month of June.…”

Section: Resultsmentioning

confidence: 99%

Reproductive activity of Suffolk ewes in seasonal anestrus after being exposed to Saint Croix or Suffolk rams

Clemente

Orihuela

Flores-Pérez

et al. 2012

Journal of Applied Animal Research

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The purpose of this study was to examine the hypothesis that rams of a tropical breed may be more effective than rams of temperate breed in inducing a reproductive response in ewes of temperate origin during the anoestrous period. Thirty Suffolk ewes in seasonal anestrus were assigned to one of three groups. In the control group (n 09), no males were present, while in the second group (Suffolk rams [SUF]; n 09) ewes were exposed to Suffolk males continuously for 13 days and twice per day from days 14-30, while in the third (Saint croix rams [SCR]; n012), ewes were treated as in SUF, but rams were from the Saint Croix breed. Sexual receptivity was recorded daily for 30 days after introduction of the males and lambing data were recorded in the fall in SUF and SCR groups. In addition, serum progesterone (P 4 ) concentration was used to monitor ovarian activity in all groups. No reproductive activity was observed in controls. In SUF, six ewes ovulated but did not show estrus, while in SCR all ewes showed estrus, ovulated and were mated. In addition, all but one of the ewes in SCR lambed. It was concluded the Saint Croix rams were more effective than Suffolk rams in inducing an estrous response, conception and pregnancy in anestrous Suffolk ewes.

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Evaluation of sexual behavior of hair sheep rams in a tropical environment.

Cited by 28 publications

References 10 publications

Libido and serving capacity of mature hair rams under tropical environmental conditions

Libido and serving capacity of mature hair rams under tropical environmental conditions

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 activity of Suffolk ewes in seasonal anestrus after being exposed to Saint Croix or Suffolk rams

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