Journal ArticleDOI
Effect of semen collection frequency on seasonal variation in sexual behaviour, testosterone, testicular size and semen characteristics of tropical hair rams (Ovis aries).
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The magnitude of the seasonal effects was not sufficient to prevent the rams being used for breeding throughout the year, and seasonal variation within variables was affected differently between semen collection frequencies.Abstract:
The purpose of this study was to examine the effect of day length on seminal characteristics, testicular size, sexual behaviour and testosterone (T4) concentration in Pelibuey rams subjected to different semen collection frequencies. Eighteen intact males were assigned randomly to one of two semen collection frequencies: in the high rate (HR) treatment, two ejaculations per week were obtained from each ram; one ejaculation every two weeks was collected under the low rate (LR) treatment. All animals were housed individually in contiguous 5 m × 5 m wire mesh pens and evaluated over a 12-month period. At the beginning of the experiment rams were 20 months old and 40–50 kg in weight. All rams ejaculated and produced semen throughout the year. Semen volume, sperm per ejaculation, testicular circumference and testicular volume were significantly (p < 0.05) greater during short days in all rams, regardless of the semen collection frequency, with the exception of sperm concentration, for which no variation was found in HR individuals, and reaction time and T4 levels, for which no variation was found in LR males. Rams subjected to HR collection were more affected by the short-day photoperiod than rams collected twice per week, exhibiting greater reduction (p < 0.05) in time to achieve their first ejaculation and in sperm per ejaculation, as well as greater increases (p < 0.05) in T4 concentration than LR rams (14.65 ± 1.22 vs 23.53 ± 5.34 s, (3.37 ± 0.17) × 109 vs (3.52 ± 0.20) × 109 sperm and 8.68 ± 0.44 vs 6.85 ± 0.74 ng/ml, respectively). It was concluded that: (a) the magnitude of the seasonal effects was not sufficient to prevent the rams being used for breeding throughout the year, and (b) seasonal variation within variables was affected differently between semen collection frequencies.read more
Citations
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Journal ArticleDOI
Computer assisted semen analysis of deccani ram semen presevability at 5ºC
TL;DR: Sperm kinematics assessment by CASA revealed Sodium citrate-based egg-yolk extender (SC) as better extender for preservation of Deccani Ram semen upto 48 hr. of storage as compared to T and C.
Journal ArticleDOI
The influence of semen collection frequency on deleterious the interaction between the enzymes of the bulbourethral gland and egg yolk during the dilution of buck semen
Nawaf N. Dhaher,D.M. Aziz +1 more
TL;DR: There are effects of semen collection frequency on the ability of buck semen dilution, and the best results were when ejaculates had collected twice a day at an interval of one hour, accordingly the best protocol for preparation of Buck semen for artificial insemination is recommended.
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 Actividad reproductiva de carneros Santa Cruz y Suffolk en latitudes medias (19º N) durante días largos mientras son expuestas ante hembras Suffolk en anestro estacional
TL;DR: Sexual behaviour decreases in sheep breeds of temperate origin during long day length, while tropical rams have been reported to be almost aseasonal, however sexual behaviour in temperate breeds is not affected.
Journal ArticleDOI
Effects of pituitary-specific overexpression of FSHα/β on reproductive traits in transgenic boars
Wenting Li,Wenting Li,Yujun Quan,Yujun Quan,Mengmeng Zhang,Ke-Jun Wang,Ke-Jun Wang,Muzhen Zhu,Ye Chen,Qiuyan Li,Keliang Wu +10 more
TL;DR: Pituitary-specific overexpression of FSHα/β genes is likely to impact reproductive traits positively, as indicated by enhancements in serum testosterone level, testis weight, the development of vas deferens, seminiferous tubules, and Leydig cells in transgenic boars.
Journal ArticleDOI
Seasonal Variations in Semen Quality, Testosterone Levels, and Scrotal Size following Dietary Flaxseed Oil and Ascorbic Acid in South African Indigenous Rams
Jabulani Nkululeko Ngcobo,Tshimangadzo Lucky Nedambale,Takalani J Mpofu,Khathutshelo Agree Nephawe,Tlou Caswell Chokoe,F. V. Ramukhithi +5 more
TL;DR: In this article , the seasonal variations in semen quality, testosterone levels, and scrotal size following dietary flaxseed oil and ascorbic acid in South African indigenous rams were evaluated.
References
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Journal ArticleDOI
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TL;DR: The design and analysis of experiments in the animal and medical sciences and the results show clear trends in animal studies and in the medical sciences are consistent with each other.
Book ChapterDOI
Seasonal breeding:nature's contraceptive.
G A Lincoln,Roger V. Short +1 more
TL;DR: The seasonal cycle highlights the seasonal changes in daylight length, rutting behavior, testicular diameter, sexual skin flush, and concentrations of plasma follicle-stimulating hormone, prolactin, and testosterone in a group of rams throughout the year.
Journal ArticleDOI
Dominant rams lose out by sperm depletion
TL;DR: A waning success in siring counters a ram's high score in competition for ewes.
Journal ArticleDOI
Seasonality of reproduction in sheep
H.J.D. Rosa,M. J. Bryant +1 more
TL;DR: The manifestations of seasonality in both the ram and the ewe are described and special emphasis is given to the neuroendocrine base of photoperiodic regulation of seasonal breeding.