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Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn
The pampas deer is an endangered species, from which reproductive biology little is known. We aimed to describe and compare the reproductive seasonal patterns of adult and yearling pampas deer stags throughout the year, including morphological traits, testosterone concentration, sperm morphology and...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Colégio Brasileiro de Reprodução Animal
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7375868/ https://www.ncbi.nlm.nih.gov/pubmed/32714462 http://dx.doi.org/10.1590/1984-3143-AR2020-0021 |
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author | Ungerfeld, Rodolfo Villagrán, Matías Gil-Laureiro, Jorge Sestelo, Adrián Beracochea, Florencia Fumagalli, Fernando Bielli, Alejandro |
author_facet | Ungerfeld, Rodolfo Villagrán, Matías Gil-Laureiro, Jorge Sestelo, Adrián Beracochea, Florencia Fumagalli, Fernando Bielli, Alejandro |
author_sort | Ungerfeld, Rodolfo |
collection | PubMed |
description | The pampas deer is an endangered species, from which reproductive biology little is known. We aimed to describe and compare the reproductive seasonal patterns of adult and yearling pampas deer stags throughout the year, including morphological traits, testosterone concentration, sperm morphology and cryoresistance pattern changes. Six adult (AS) and five yearling (YS) stags were captured with anesthetic darts once in winter, spring, summer and autumn to study morphological variables, serum testosterone and semen. Adult males were heavier, their neck girth tended to be greater and their testosterone concentration was higher than in YS. Animals were heavier in summer and autumn. Neck girth and testosterone concentration were greater in autumn. Scrotal circumference, testicular volume and gonado-somatic index varied with seasons, decreasing from winter to spring, increasing in summer and remaining in greater values in autumn. Sperm quality had maximum values from summer to winter. However, the cryoresistance ratio of motility score was greater in spring. In conclusion, in the captivity conditions, pampas deer stags seems to present a light seasonal reproductive pattern, with maximum testis size, testosterone secretion and fresh semen quality in autumn. Nevertheless, sperm cryoresistance ratio seemed to remain stable along the year. Although YS were still growing, they achieved similar semen quality than AS. |
format | Online Article Text |
id | pubmed-7375868 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Colégio Brasileiro de Reprodução Animal |
record_format | MEDLINE/PubMed |
spelling | pubmed-73758682020-07-24 Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn Ungerfeld, Rodolfo Villagrán, Matías Gil-Laureiro, Jorge Sestelo, Adrián Beracochea, Florencia Fumagalli, Fernando Bielli, Alejandro Anim Reprod Original Article The pampas deer is an endangered species, from which reproductive biology little is known. We aimed to describe and compare the reproductive seasonal patterns of adult and yearling pampas deer stags throughout the year, including morphological traits, testosterone concentration, sperm morphology and cryoresistance pattern changes. Six adult (AS) and five yearling (YS) stags were captured with anesthetic darts once in winter, spring, summer and autumn to study morphological variables, serum testosterone and semen. Adult males were heavier, their neck girth tended to be greater and their testosterone concentration was higher than in YS. Animals were heavier in summer and autumn. Neck girth and testosterone concentration were greater in autumn. Scrotal circumference, testicular volume and gonado-somatic index varied with seasons, decreasing from winter to spring, increasing in summer and remaining in greater values in autumn. Sperm quality had maximum values from summer to winter. However, the cryoresistance ratio of motility score was greater in spring. In conclusion, in the captivity conditions, pampas deer stags seems to present a light seasonal reproductive pattern, with maximum testis size, testosterone secretion and fresh semen quality in autumn. Nevertheless, sperm cryoresistance ratio seemed to remain stable along the year. Although YS were still growing, they achieved similar semen quality than AS. Colégio Brasileiro de Reprodução Animal 2020-06-29 /pmc/articles/PMC7375868/ /pubmed/32714462 http://dx.doi.org/10.1590/1984-3143-AR2020-0021 Text en Copyright © The Author(s). https://creativecommons.org/licenses/by/4.0/ Copyright © The Author(s). 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 work is properly cited. |
spellingShingle | Original Article Ungerfeld, Rodolfo Villagrán, Matías Gil-Laureiro, Jorge Sestelo, Adrián Beracochea, Florencia Fumagalli, Fernando Bielli, Alejandro Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title | Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title_full | Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title_fullStr | Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title_full_unstemmed | Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title_short | Adult and yearling pampas deer stags (Ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
title_sort | adult and yearling pampas deer stags (ozotoceros bezoarticus) display mild reproductive seasonal patterns with maximum values in autumn |
topic | Original Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7375868/ https://www.ncbi.nlm.nih.gov/pubmed/32714462 http://dx.doi.org/10.1590/1984-3143-AR2020-0021 |
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