The onset of puberty in North American bison (Bison bison) bulls

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

doi:10.1016/j.anireprosci.2006.01.007

Cited by 18 publications

(7 citation statements)

References 17 publications

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“…The approximate age of bulls used ranged from 2 to 6 years. Although it was not possible to establish a relationship between age and estimated number of sperm recovered in this study, age significantly influenced sperm concentration (Helbig et al. 2007a).…”

Section: Discussionmentioning

confidence: 81%

Recovery and Cryopreservation of Epididymal Sperm of Plains Bison (Bison bison bison) as a Model for Salvaging the Genetics of Wood Bison (Bison bison athabascae)

Aurini¹,

Whiteside

Elkin

et al. 2009

Reprod Domestic Animals

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The objective of this study was to optimize recovery and cryopreservation of epididymal sperm from plains bison, as a model for wood bison. In Phase 1, cauda epididymides were recovered from bison (n = 14) immediately after slaughter, minced and incubated in Sp-TALPH buffer for 3 h at 36 degrees C. The resulting sperm suspensions were cryopreserved in Triladyl, using a protocol for bovine semen. In Phase 2, epididymal sperm were cryopreserved in either Triladyl or Andromed. The mean (+/-SD) estimated number of sperm recovered was 468 +/- 207 x 10(6). There was an increase (p < 0.05) in the proportion of sperm with normal morphology between initial recovery and after extension (52.4 +/- 4.6 vs 69.7 +/- 2.4%), with a concurrent decrease (p < 0.05) in the proportion of sperm with distal droplets. Median values for progressively motile sperm in post-thaw samples (60%) were lower (p < 0.05) than that after extension or after chilling (70% for both). The mean percentages of viable sperm and of sperm with an intact acrosome were lower (p < 0.05) for frozen-thawed samples (38.7 +/- 2.8 and 85.2 +/- 1.1) compared with extended (66.2 +/- 2.2 and 92.4 +/- 0.9) or chilled (63.7 +/- 2.5 and 90.0 +/- 1.0) samples. Rates of cleavage, morulae and blastocyst production were not significantly different for chilled (70.9, 38.7 and 8.0%) vs post-thaw sperm (73.0, 46.0 and 6.3%). There was no significant difference between extenders for most sperm characteristics. In conclusion, we developed a functional protocol for the recovery and cryopreservation of epididymal sperm from plains bison, which may have implications for the genetic preservation of wood bison.

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Section: Discussionmentioning

confidence: 81%

Recovery and Cryopreservation of Epididymal Sperm of Plains Bison (Bison bison bison) as a Model for Salvaging the Genetics of Wood Bison (Bison bison athabascae)

Aurini¹,

Whiteside

Elkin

et al. 2009

Reprod Domestic Animals

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“…Breeding structure parameters such as inter‐individual variation in offspring number and sex‐dependent reproductive age ranges likely differ among herds but have been largely unevaluated (however, see Berger & Cunningham 1994; Kirkpatrick et al . 1996; Helbig et al . 2006).…”

Section: Discussionmentioning

confidence: 99%

“…Differences in management strategies are expected to influence effective population sizes and levels of genetic variation among herds (Frankham 1996). Breeding structure parameters such as inter-individual variation in offspring number and sex-dependent reproductive age ranges likely differ among herds but have been largely unevaluated (however, see Berger & Cunningham 1994;Kirkpatrick et al 1996;Helbig et al 2006). Therefore, classical calculations of effective population sizes among these herds are not feasible at this time (Lande & Barrowclough 1987).…”

Section: Factors Influencing Differences In Genetic Diversity Among Hmentioning

confidence: 99%

Patterns of genetic variation in US federal bison herds

Halbert

Derr

2008

Molecular Ecology

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Like many wide-ranging mammals, American bison (Bison bison) have experienced significant range contraction over the past two centuries and are maintained in artificially isolated populations. A basic understanding of the distribution of genetic variation among populations is necessary to facilitate long-term germplasm preservation and species conservation. The 11 herds maintained within the US federal system are a critically important source of germplasm for bison conservation, as they include many of the oldest herds in the USA and have served as a primary resource for the establishment of private and public herds worldwide. In this study, we used a panel of 51 nuclear markers to investigate patterns of neutral genetic variation among these herds. Most of these herds have maintained remarkably high levels of variation despite the severe bottleneck suffered in the late 1800s. However, differences were noted in the patterns of variation and levels of differentiation among herds, which were compared with historical records of establishment, supplementation, herd size, and culling practices. Although some lineages have been replicated across multiple herds within the US federal system, other lineages with high levels of genetic variation exist in isolated herds and should be considered targets for the establishment of satellite herds. From this and other studies, it is clear that the genetic variation represented in the US federal system is unevenly distributed among National Park Service and Fish and Wildlife Service herds, and that these resources must be carefully managed to ensure long-term species conservation.

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“…Low ranking male bison in this study were both not sexually mature, and not physically in condition to win challenges, which can explain their comparatively low challenging frequency ( Fig. 2; Mooring et al 2006;Helbig et al 2006). This emphasizes the importance of the demographic structure of a herd and the influences on observed behaviors.…”

Section: Discussionmentioning

confidence: 65%

High society: behavioral patterns as a feedback loop to social structure in Plains bison (Bison bison bison)

King¹,

Caven²,

Leung³

et al. 2019

Mamm Res

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Social organization as a topic has wide application often conserved across lineages and can lead to complex cultures, yet it is still not well understood in many taxa. We observed American bison (Bison bison) to investigate the interactions of hierarchy and behavior to elucidate patterns of social organization. Bison are highly visible animals that live in relatively accessible grasslands, and most are in semi-wild conservation herds that allows for access to low-stress observation and physiological exams. We observed behaviors in a semi-wild, reintroduced herd of 53 bison in a 140-ha prairie from April to October 2015 (165 h of observation). After establishing a linear hierarchy, we categorized individuals of each sex as high, mid-, or low ranking and then evaluated behavioral trends across rank and sex. We found that high ranking males constantly defended their linear positions and focused breeding efforts on the females with the highest productivity, consistent with disruptive sex characteristics. Intra-rank conflict focused on linear positioning likely causes the volatility in male bison hierarchy and stress of domination. Female bison, however, tend to suppress the lowest class, which likely drives their hierarchy's stability and stress of subordination. Our results show that male and female bison are impacted differently by their social rankings and show that individual aggressive actions may provide feedback loops to their social organization.

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The onset of puberty in North American bison (Bison bison) bulls

Cited by 18 publications

References 17 publications

Recovery and Cryopreservation of Epididymal Sperm of Plains Bison (Bison bison bison) as a Model for Salvaging the Genetics of Wood Bison (Bison bison athabascae)

Recovery and Cryopreservation of Epididymal Sperm of Plains Bison (Bison bison bison) as a Model for Salvaging the Genetics of Wood Bison (Bison bison athabascae)

Patterns of genetic variation in US federal bison herds

High society: behavioral patterns as a feedback loop to social structure in Plains bison (Bison bison bison)

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