Effects of low environmental temperature on the reproductive organs of male mammals with annual aspermia

Wells, L. J.; Zalesky, Moses

doi:10.1002/aja.1000660305

Cited by 31 publications

(5 citation statements)

References 13 publications

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“…Male rats and ground squirrels show spermatogenesis, but do not maintain the weights of their sex accessories (Brolin, 1945;Wells & Zalesky, 1940). The species differences in sexual responses to a cold environment are not explicable on the basis of the type of thermal regulation the animal has (homoio-or heterothermic), nor the number of oestrous cycles per year (mono-or polyoestrous) and appear to be species specific.…”

Section: Resultsmentioning

confidence: 99%

Effects of Cold Exposure on the Oestrous Cycle of the Golden Hamster (Mesocricetus Auratus)

Re¹,

Ge²

1962

Reproduction

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Section: Resultsmentioning

confidence: 99%

Effects of Cold Exposure on the Oestrous Cycle of the Golden Hamster (Mesocricetus Auratus)

Re¹,

Ge²

1962

Reproduction

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“…In the model with ‘lot’ just as was in the case of rainfall where temperatures had no significant effects on corticosterone, ‘lot’ as a confounding effect can be explained by its correlation with the climatic variables. Moreso, increases in temperature has been reported to stimulate the pituitary gland to gonadotrophic activity (Wells & Zalesky, 1940) to increase levels of secreted corticosterone metabolites in free‐ranging North American elk ( Cervus elaphus ) (Millspaugh et al., 2001).…”

Section: Discussionmentioning

confidence: 99%

“…to stimulate the pituitary gland to gonadotrophic activity (Wells & Zalesky, 1940) to increase levels of secreted corticosterone metabolites in free-ranging North American elk (Cervus elaphus) (Millspaugh et al, 2001).…”

Section: Land Surface Temperaturesmentioning

confidence: 99%

Physiological stress in eastern black rhinoceros (Diceros bicornis michaeli) as influenced by their density, climatological variables and sexes

Okita‐Ouma,

Gort,

Millspaugh

et al. 2023

Afr J Ecol

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It is important to understand the physiological stressors in animals especially for threatened species or intensively managed to improve their conservation and optimise their reproduction. We sought to understand changes in stress hormones (faecal glucocorticoid metabolites) in black rhinoceros (Diceros bicornis michaeli) in relation to population density and sex (intrinsic factors) and plant minerals, rainfall and land surface temperature (extrinsic factors). We used non‐invasive faecal sampling techniques on animals of known sex, age and dominance in seven populations of contrasting population densities over 1 year. We measured variability in faecal corticosterone metabolites through radioimmunoassay and related them to population density, sex and faecal calcium, phosphorus, copper, zinc and potassium as characteristic of plant minerals, rainfall and temperature. We used linear mixed models (LMM) to analyse the data. We did not detect a significant relationship between physiological stress parameters and population density. However, we have indications that stress levels increased as rainfall and temperature increased and were correlated negatively and positively with concentration of faecal phosphorus and copper respectively; we found higher stress levels in females than in males. These results suggest that both intrinsic and extrinsic factors explain the variation in physiological stress observed in black rhinoceros.

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“…It has been described repeatedly (Wells and Zalesky 1940;Mrosovsky and Lang 1971;Mrosovsky 1978;Joy and Mrosovsky 1985;Ambid and Berges 1986;Barnes and York 1990). Even though its incidence is unpredictable, this phenomenon must be included in theorizing about circannual rhythms in squirrels.…”

Section: Discussionmentioning

confidence: 99%

Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

Mrosovsky

1990

J Comp Physiol A

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Endogenous circannual rhythms of male golden-mantled ground squirrels (Spermophilus lateralis) exposed to low ambient temperature (6 ~ at various times were compared to the rhythms of a control group kept in a warm room (21 ~ throughout. A 20-week pulse of cold in the spring delayed the subsequent peak body weight and molt offset. However, in the second year after the spring cold pulse, a delay in the rhythm was evident only using peak weight as a phase marker. A 20-week cold pulse in the fall resulted in an earlier peak body weight and earlier onset of pigmented scrotum and descended testes, but there was no evidence from subsequent years that rhythms had been phase advanced. A third of the animals kept continuously at 6 ~ remained with pigmented scrotum, descended testes and low body weight for more than a year. Circannual periodicities of animals that continued to display rhythms in the cold room were not significantly longer than those of controls in the warm room. The results suggest that low temperature in the fall can alter the expression of circannual rhythms without much affecting their phasing, while low temperature in the spring produces phase delays which last longer but have not been proved to be persistent.

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Effects of low environmental temperature on the reproductive organs of male mammals with annual aspermia

Cited by 31 publications

References 13 publications

Effects of Cold Exposure on the Oestrous Cycle of the Golden Hamster (Mesocricetus Auratus)

Effects of Cold Exposure on the Oestrous Cycle of the Golden Hamster (Mesocricetus Auratus)

Physiological stress in eastern black rhinoceros (Diceros bicornis michaeli) as influenced by their density, climatological variables and sexes

Circannual cycles in golden-mantled ground squirrels: fall and spring cold pulses

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