The Breed and Season Effects on Scrotal Circumference and Semen Characteristics of Hair Sheep Rams Under Tropical Conditions

Cárdenas-Gallegos, MA; Aké-López, JR; Centurión-Castro, Fernando; Magaña-Monforte, JG

doi:10.1111/j.1439-0531.2012.02001.x

Cited by 14 publications

(8 citation statements)

References 9 publications

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“…The semen volume, colour, wave motion and individual motility did not show any significant variation (p>0.05) between or within breeding (winter) and non-breeding (summer) seasons in NARI Suwarna rams (Table 1). These findings are in line with studies of Cárdenas-Gallegos et al, (2012) and Benmoula et al, (2017)reporting no seasonality for semen volume, wave motion and individual motility in different breeds of rams. Further, the observed colour of semen as creamy white was in agreement with earlier reports for NARI Suwarna ram semen by Kaimal (2015), Kadaganchi (2017), Jasrotia (2018) and Muniyappanavar (2019) as creamy to creamy white colour.…”

Section: Volume Colour Wave Motion and Individual Motilitysupporting

confidence: 92%

Semen Characteristics of NARI Suwarna Rams during Breeding (Winter) and Non-breeding (Summer) Seasons

Doddagoudar¹,

Tandle²,

Bijurkar³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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Section: Volume Colour Wave Motion and Individual Motilitysupporting

confidence: 92%

Semen Characteristics of NARI Suwarna Rams during Breeding (Winter) and Non-breeding (Summer) Seasons

Doddagoudar¹,

Tandle²,

Bijurkar³

et al. 2020

Int.J.Curr.Microbiol.App.Sci

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“…Thus, in our case the high number of distal droplets is most likely related to the examination of epididymal spermatozoa and/or due to the young age of the rams. The scrotal circumference of the rams examined in this study (27.68 cm) is less than reported for hair sheep (∼31‐35 cm) and is most likely due to the young age of the rams examined as their scrotal circumference was increasing each month examined . The increase in distal droplets in the moderate and severe ultrasound groups may be related to alterations in epididymal transport time in rams with more severe lesions.…”

Section: Discussioncontrasting

confidence: 61%

“…Testicular degeneration has many causes including thermal damage, age related changes, toxins, trauma, and infection . In tropical hair sheep, breed and seasonal temperature changes do affect scrotal circumference and semen quality, but rams are still able to maintain good semen quality throughout the year . Insulation of the scrotum of hair rams to simulate elevated scrotal temperature does have a negative impact on semen quality .…”

Section: Introductionmentioning

confidence: 99%

The prevalence of ultrasonographic abnormalities and histopathologic lesions is high in testes of yearling tropical hair rams

Dascanio

Roberson

Pfent

et al. 2019

Vet Radiology Ultrasound

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Ultrasonography is commonly used to examine testes as part of a breeding soundness examination in sheep, especially, in cases of infertility or when gross testicular abnormalities are present.A descriptive, prospective, prevalence study was conducted to characterize the ultrasonographic, histopathologic, and spermatozoal morphology abnormalities present in a group of yearling tropic hair rams on the island of St. Kitts. Hyperechoic and shadowing abnormalities increased over a 6 month study period. Hyperechoic abnormalities were present in one or both testes in 89% (25/28) of yearling rams and 71% (40/56) of testes at castration. Shadowing abnormalities were present in one or both testes in 46% (13/28) of rams and 34% (19/56) of testes at castration. Shadowing was present more with moderate and severe hyperechoic abnormalities, with few testes in the mild category having any shadowing. As hyperechoic and shadowing abnormalities increased in severity, so did the severity of microscopic lesions including increased interstitial cellularity/fibrosis, interstitial mineralization, seminiferous tubules mineralization (hyperechoic only), and chronic lymphoplasmacytic orchitis. There were no spermatozoal morphologic abnormalities other than an increase in distal cytoplasmic droplets. The study findings detail a pathologic event in this group of yearling rams that has an unknown etiology. Potential causes may include scrotal insulation, trauma, infectious causes, immunity alterations, nutritional imbalances, and ingestion of a toxin.Further studies are required to elucidate the causative agent. K E Y W O R D Sdegeneration, histology, ovine, testicular ultrasound 338

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“…The artificial vagina was placed on the right side of the ewe at the height of the vulva and just as the ram was to penetrate, with the help of the operator's hand, the penis was diverted into the artificial vagina and the ejaculation was performed. Semen characteristics of these rams were reported by Cárdenas-Gallegos et al (2012).…”

Section: Ram Evaluationsmentioning

confidence: 99%

“…Time from the introduction of the ram and his first mating (reaction time) and latency (refractory period) between the first and second and between the second and third mating were recorded. At no time rams were allowed to copulate the exposed ewes, first due to health reasons and secondly because studies such as Aguirre et al (2007) and Cárdenas-Gallegos et al (2012), show that this method of assessment does not affect sexual behaviour of rams. It was considered as mating when rams mounted, penetrated and ejaculated into an artificial vagina.…”

Section: Ram Evaluationsmentioning

confidence: 99%

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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The Breed and Season Effects on Scrotal Circumference and Semen Characteristics of Hair Sheep Rams Under Tropical Conditions

Cited by 14 publications

References 9 publications

Semen Characteristics of NARI Suwarna Rams during Breeding (Winter) and Non-breeding (Summer) Seasons

Semen Characteristics of NARI Suwarna Rams during Breeding (Winter) and Non-breeding (Summer) Seasons

The prevalence of ultrasonographic abnormalities and histopathologic lesions is high in testes of yearling tropical hair rams

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

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