Comparative analysis of sperm motility in liquid and seminal coagulum portions between Bornean orangutan (Pongo pygmaeus) and chimpanzee (Pan troglodytes)
| Autor: | Yasuhiko Ozaki, Toshio Kobayashi, Kodzue Kinoshita, Naruki Morimura, Fumihiko Okumura, Munehiro Okamoto, Yoriko Indo, Noko Kuze, Yusuke Mori, Satoshi Hirata, Mitsuaki Ogata, Tomoyuki Nakamura, Tomoyuki Tajima, Takashi Hayakawa, Etsuko Miyakawa |
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| Rok vydání: | 2021 |
| Předmět: |
0106 biological sciences
endocrine system urogenital system Artificial insemination medicine.medical_treatment 05 social sciences Zoology Semen Biology 010603 evolutionary biology 01 natural sciences Sperm Pongo pygmaeus Animal ecology Captive breeding medicine 0501 psychology and cognitive sciences Animal Science and Zoology 050102 behavioral science & comparative psychology Sperm competition Sperm motility |
| Zdroj: | Primates. 62:467-473 |
| ISSN: | 1610-7365 0032-8332 |
| Popis: | Coagulum in the semen of some primates plays different roles, depending on the species. In the present study, we examined sperm motility in the coagulum and liquid portions of semen collected from captive individuals from two great ape species: two adult Bornean orangutans (Pongo pygmaeus) (n = 27) and three adult chimpanzees (Pan troglodytes) (n = 14). The results revealed that orangutan sperm remained motile for significantly longer in the coagulum than in the liquid portion (> 18 h). By contrast, chimpanzee sperm motility did not differ significantly over time between the two portions of the semen, although motility was slightly higher in the liquid portion than in the coagulum. The evolution of the seminal coagulum is thought to be related to postcopulatory sperm competition; however, functions of seminal coagulum have not been completely elucidated. Our data from the orangutan semen suggest that in this species, seminal coagulum may strengthen own-sperm survival. This report is the first to provide evidence for this distinctive function of the seminal coagulum. This unique property of orangutan seminal coagulum might be attributable to their reproductive traits, e.g., difficulty in predicting ovulation due to a lack of genital swelling during estrus. The orangutan is a Critically Endangered species, and captive breeding, including artificial insemination (AI), is expected. However, worldwide, only one case of orangutan AI has been successful. Our findings may contribute to an understanding of their basic semen characteristics and help improve the AI method. |
| Databáze: | OpenAIRE |
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