The seasonal fertility of North American bison (Bison bison) bulls

Helbig, L.; Woodbury, Murray R.; Haigh, J. C.; Collins, James E.; Barth, A.D.

doi:10.1016/j.anireprosci.2006.02.001

Cited by 23 publications

(18 citation statements)

References 7 publications

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“…However, Rekwot et al (1987) and Igboeli et al (1987) obtained highest ejaculate volume during rainy season; whereas Goswami et al (1991) found highest semen volume during winter season. No significant (P<0.05) seasonal difference was observed in ejaculate volume which is in agreement with the findings of Tomar et al (1966) in Hariana bulls and Helbig et al (2007) in American bison. On the contrary, significant (P<0.01) seasonal difference was observed in ejaculate volume was reported by in zebu-exotic half breds and Mathur et al (2002) in Frieswal bulls.…”

Section: Advances In Animal and Veterinary Sciencessupporting

confidence: 82%

“…Mass activity was highest during winter, followed by rainy and summer season. Similar to our finding the highest mass activity during winter season had been reported in Zebu-taurus bulls (Goswami et al 1991) and in zebu-exotic half breds, Whereas Mathur et al (2002) in Frieswal bulls and Helbig et al (2007) in American bison obtained no significant (P<0.05) seasonal variation in mass activity. Significant (P<0.05) seasonal difference was observed in initial motility percent (IM) which is in agreement with the findings of Igboeli et al (1987) in Bos brachyceros and Goswami et al (1991) in Zebu-taurus bulls.…”

Section: Advances In Animal and Veterinary Sciencessupporting

confidence: 80%

“…However, Rekwot et al (1987) obtained highest value during rainy season and obtained highest value during cold-dry in zebu-exotic half breds. On the contrary, Mathur et al (2002) in Frieswal bulls and Helbig et al (2007) in American bison reported no significant seasonal variation in sperm concentration. In the present finding lower concentration of spermatozoa during the summer may be due to significant reduction in the feed intake and increase in dead and abnormal spermatozoa.…”

Section: Advances In Animal and Veterinary Sciencesmentioning

confidence: 93%

“…The environment has both direct and indirect impact; directly through change in macro and micro climatic factors (Barth and Waldner, 2002) like temperature, humidity, rainfall and photo-period, whereas indirectly by affecting the vegetation, forage quality and soil-plant-animal interaction. The information regarding the effect of seasons on semen characteristics in dairy bulls has been reported to be of a conflicting nature (Bhakat et al, 2009), Some research workers have reported significant effect of season (Rekwot et al, 1987;Goswami et al, 1991 andRaina, 2000), while others observed non-significant effect (Mathur et al, 2002;Helbig et India has different agro-ecological zones having wide variety of climatic conditions and this can naturally lead to variations in findings of various authors. In general, of all seasons, summer exerts comparatively more adverse effect on the overall quality of semen.…”

Section: Introductionmentioning

confidence: 97%

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Effect of Season on Semen Quality of Crossbred (Karan Fries) Bulls

Bhakat¹,

Mohanty²,

Gupta³

et al. 2014

Adv. Anim. Vet. Sci.

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| One hundred and fifty six ejaculates from eight Karan Fries (KF) bull were collected to study the effect of season (summer, rainy and winter) on semen quality parameters at Artificial Breeding Research Centre, NDRI, Karnal, India. The data was analysed using least square analysis. Season had no significant effect on ejaculate volume, mass activity, total sperm output and pH of the semen, whereas it had significant (P<0.05) effect on initial motility, non-eosinophilic count and acrosome integrity of sperms as well as highly significant (P<0.01) effect on HOST, sperm concentration, sperm abnormalities and osmolality of semen in KF bulls. The results clearly indicate that during summer season, the highest values of sperm abnormalities, pH and OSMOL and lowest values of IM, SPC, SPCE, LIVE, HOST and AI was observed. During winter season highest magnitude of MA, IM, SPC, SPCE, LIVE, HOST and AI and lowest value of VOL, sperm abnormalities, pH and OSMOL were observed in KF bulls. It was concluded that the semen qualities were optimal during winter, poor during summer and intermediate during rainy

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Section: Advances In Animal and Veterinary Sciencessupporting

confidence: 82%

Section: Advances In Animal and Veterinary Sciencessupporting

confidence: 80%

Section: Advances In Animal and Veterinary Sciencesmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Effect of Season on Semen Quality of Crossbred (Karan Fries) Bulls

Bhakat¹,

Mohanty²,

Gupta³

et al. 2014

Adv. Anim. Vet. Sci.

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“…In comparison to other ungulates, spermiogenesis in European bison appears quite late (Czykier et al 1999). For example in male wapiti (Cervus elaphus), the sperm was found to be present in ejaculate in 2-year-old specimens (Haigh et al 1984), in male fallow deer (Dama dama) at the age of 16 months (Chapman andChapman 1970, Chaplin andWhite 1972), in male red deer (Axis axis) between 12 and 15 months (Webster et al 1992) and in male North American bison (Bison bison) from 18 to 33 months of age (Helbig et al 2007). …”

Section: Discussionmentioning

confidence: 99%

Is spermiogenesis common or rare in young male European bison aged 2 and 3 years?

Czykier¹

2011

Polish Journal of Veterinary Sciences

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The aim of the present study was to determine how often spermiogenesis occurs in young male European bison up to 3 years old. Research was performed on sections of the testes and epididymes collected from 51 male bison aged 2-3 years. The animals were divided into 2 age groups: young males up to 2 years and young males up to 3 years old, with further separation into specimens with or without spermiogenesis. The animals were culled during the autumn-winter seasons in 1994-2008 (after rutting period) in the Bialowieża Primeval Forest. Spermiogenesis in the 2-year-old animals was a rare condition found in 16.7% of cases. However, at the age of 3 years more than half of the individuals examined (53.3%) had spermiogenesis. Young males up to 2 years old with spermiogenesis were characterized by a significantly higher body weight and their right testis also weighed more than the left testis of the animals without spermiogenesis, the difference being on the border of statistical significance.There was no significant differences in the body mass and weight of the left testis between older animals, up to 3 years old, with or without spermiogenesis. However, young males up to 3 years old with spermiogenesis were characterized by a significantly higher weight of the right testis than those without spermiogenesis.

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Changes of weight and size of European bison testes during postnatal development

et al. 2009

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2009. Changes of weight and size of European bison testes during postnatal development. Acta Theriologica 54: 111-126.The material for this study was obtained from culled European bison (Linnaeus, 1758) originating from both captive breeding and free-ranging populations in Bia³owie¿a and Borecka Forests (north-east Poland), and was mostly collected from November until April. Mass difference between the right and left testis of the same individual up to 30% was considered to be physiological asymmetry, which proved typical of the species. Hypoplasia or atrophy of the testes exceeding 30% in size, were found in 37 males (13.6% of the examined animals; n = 272). Cryptorchidism was recorded in 20 bison culled in Bia³owie¿a Forest at the age over 1 year (10.6% of individuals at the same age; n = 188). We registered the weight of testes of 259 males aged 2 months to 20 years. In the examined males, no distinct predominance in size and weight between the right and left testes was observed. The weight of testes was significantly correlated with age (r = 0.85, p < 0.0001) and body weight (r = 0.93, p < 0.0001). The heaviest testicles belonged to older and sexually mature bulls aged 6-12 years (mean 216 g) and to old ones over 13 years (mean 242 g). Two testis measurements (length and width) were taken from 136 culled males, while two additional measurements (total length with the cauda of epididymis and circumference) from 65 males. The length and width of the testes were moderately correlated with age (r = 0.31 and r = 0.20, p < 0.01) and highly significantly correlated with testis (r = 0.79, p < 0.001) and body weight (r = 0.92, p < 0.001).

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The seasonal fertility of North American bison (Bison bison) bulls

Cited by 23 publications

References 7 publications

Effect of Season on Semen Quality of Crossbred (Karan Fries) Bulls

Effect of Season on Semen Quality of Crossbred (Karan Fries) Bulls

Is spermiogenesis common or rare in young male European bison aged 2 and 3 years?

Changes of weight and size of European bison testes during postnatal development

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