دورية أكاديمية
Intra-horn insemination in the alpaca Vicugna pacos: Copulatory wounding and deep sperm deposition.
| العنوان: | Intra-horn insemination in the alpaca Vicugna pacos: Copulatory wounding and deep sperm deposition. |
|---|---|
| المؤلفون: | Brennan PLR; Department of Biological Sciences, Mount Holyoke College, South Hadley, MA, United States of America., Purdy S; North American Camelid Studies Program, Nunoa Project, Belchertown, MA, United States of America., Bacon SJ; Department of Biological Sciences, Mount Holyoke College, South Hadley, MA, United States of America. |
| المصدر: | PloS one [PLoS One] 2024 Apr 17; Vol. 19 (4), pp. e0295882. Date of Electronic Publication: 2024 Apr 17 (Print Publication: 2024). |
| نوع المنشور: | Journal Article |
| اللغة: | English |
| بيانات الدورية: | Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE |
| أسماء مطبوعة: | Original Publication: San Francisco, CA : Public Library of Science |
| مواضيع طبية MeSH: | Copulation*/physiology , Camelids, New World*, Animals ; Female ; Male ; Pregnancy ; Semen/physiology ; Placenta ; Spermatozoa ; Insemination |
| مستخلص: | Alpacas (Vicugna pacos) are reported to be the rare mammal in which the penis enters the uterus in mating. To date, however, only circumstantial evidence supports this assertion. Using female alpacas culled for meat, we determined that the alpaca penis penetrates to the very tips of the uterine horns, abrading the tract and breaking fine blood vessels. All female alpacas sacrificed one hour or 24 hours after mating showed conspicuous bleeding in the epithelium of some region of their reproductive tract, including the hymen, cervix and the tips of each uterine horn, but typically not in the vagina. Unmated females showed no evidence of conspicuous bleeding. Histological examination of mated females revealed widespread abrasion of the cervical and endometrial epithelium, injuries absent in unmated females. Within one hour of mating, sperm were already present in the oviduct. The male alpaca's cartilaginous penis tip with a hardened urethral process is likely responsible for the copulatory abrasion. The entire female reproductive tract interacts with the penis, functioning like a vagina. Alpacas are induced ovulators, and wounding may hasten delivery of the seminal ovulation-inducing factor beta-NGF into the female's blood stream. There is no evidence of sexual conflict in copulation in alpaca, and thus wounding may also be one of a variety of mechanisms devised by mammals to induce a beneficial, short-term inflammatory response that stimulates blastocyst implantation, the uterine remodeling associated with placental development, and thus the success of early pregnancy. Competing Interests: The authors have declared that no competing interests exist. (Copyright: © 2024 Brennan et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.) |
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| تواريخ الأحداث: | Date Created: 20240417 Date Completed: 20240419 Latest Revision: 20240419 |
| رمز التحديث: | 20240419 |
| مُعرف محوري في PubMed: | PMC11023217 |
| DOI: | 10.1371/journal.pone.0295882 |
| PMID: | 38630763 |
| قاعدة البيانات: | MEDLINE |
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