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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...

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Autores principales: Ungerfeld, Rodolfo, Villagrán, Matías, Gil-Laureiro, Jorge, Sestelo, Adrián, Beracochea, Florencia, Fumagalli, Fernando, Bielli, Alejandro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Colégio Brasileiro de Reprodução Animal 2020
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.
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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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