Association Between Back Scent Gland Development and Reproductive Status in Male Brown Bears (Ursus arctos) DOI Open Access
Jumpei Tomiyasu, Naoya Matsumoto,

Katsushima Hinako

et al.

Journal of Experimental Zoology Part A Ecological and Integrative Physiology, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

ABSTRACT Cutaneous scent glands secrete chemical signals for communication, a significant portion of which is to convey information about male reproductive status. This might be particularly important animals with intraspecific variation in activity, such as bears. Male brown bears mark trees their secreted from back apocrine and sebaceous during the breeding season thus Therefore, we speculated that development reflects performance. We investigated effects status on using contraception explored relationships between parameters (testosterone levels, testis size, spermatogenic scores) size skin backs intact During season, sampled rump (control) skin, sperms by urethral catheterization, blood under anesthesia four were vaccinated contraceptive gonadotropin hormone‐releasing hormone (GnRH) vaccine five others not (controls). The significantly smaller than without GnRH vaccine, suggesting these are associated Testosterone levels positively glands, whereas none either or glands. Mating opportunities increase testosterone production. positive association mean can chemicals demand reproduction.

Language: Английский

Association Between Back Scent Gland Development and Reproductive Status in Male Brown Bears (Ursus arctos) DOI Open Access
Jumpei Tomiyasu, Naoya Matsumoto,

Katsushima Hinako

et al.

Journal of Experimental Zoology Part A Ecological and Integrative Physiology, Journal Year: 2025, Volume and Issue: unknown

Published: March 24, 2025

ABSTRACT Cutaneous scent glands secrete chemical signals for communication, a significant portion of which is to convey information about male reproductive status. This might be particularly important animals with intraspecific variation in activity, such as bears. Male brown bears mark trees their secreted from back apocrine and sebaceous during the breeding season thus Therefore, we speculated that development reflects performance. We investigated effects status on using contraception explored relationships between parameters (testosterone levels, testis size, spermatogenic scores) size skin backs intact During season, sampled rump (control) skin, sperms by urethral catheterization, blood under anesthesia four were vaccinated contraceptive gonadotropin hormone‐releasing hormone (GnRH) vaccine five others not (controls). The significantly smaller than without GnRH vaccine, suggesting these are associated Testosterone levels positively glands, whereas none either or glands. Mating opportunities increase testosterone production. positive association mean can chemicals demand reproduction.

Language: Английский

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