Seasonal changes in reproductive activity, sperm variables and sperm freezability in Blanca Andaluza bucks
| Autor: | Lourdes Gallego-Calvo, M. Carolina Gatica, Julian Santiago-Moreno, José L. Guzmán, Luis Zarazaga |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: | |
| Zdroj: | Spanish Journal of Agricultural Research, Vol 13, Iss 4, Pp e0403-e0403 (2015) |
| Druh dokumentu: | article |
| ISSN: | 1695-971X 2171-9292 |
| DOI: | 10.5424/sjar/2015134-8168 |
| Popis: | Interest in the preservation of endangered breeds such as the Blanca Andaluza goat, has increased and some steps should be therefore taken to ensure it. The study was designed to determine the seasonal reproductive pattern of Blanca Andaluza bucks, and whether this affects the quality of their semen and its freezability over the year. Seven bucks were used and their body weight, testicular weight, plasma testosterone concentration and fresh sperm quality determined every week. The collected sperm was cryopreserved and stored; it was then thawed and the same sperm quality variables measured every fortnight. High plasma testosterone concentrations were recorded during the summer and autumn, and low concentrations were recorded during winter and spring (ppp These results reveal that Blanca Andaluza bucks show seasonal reproductive activity in terms of their plasma testosterone concentration, but no clear change in their sexual behaviour between seasons was observed. The values of fresh sperm variables also vary over the year, reaching their lowest during winter. However, after freezing-thawing, winter-collected sperm is of overall better quality than sperm collected during the summer. |
| Databáze: | Directory of Open Access Journals |
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