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- Title
VARIATIONS OF THE TESTOSTERON CONCENTRATIONS ON WINTER AT THE CARPATHIAN BUCKS.
- Authors
Sogorescu, Elena; Zamfirescu, Stela; Rosoiu, Natalia; Anghel, Andreea Hortanse; Nadolu, Dorina
- Abstract
The photoperiod is the primary environmental used to regulate reproduction. On the basis of this knowledge, we studied the bucks maintained under ambient photoperiod and normally fed diet. The bucks groups are maintained in an intensive breeding system in closed and semi-opened shelters which respect the farm norms (space/animal 1,5-2m/goat, normal temperature conditions, 18- 30 0C in summer and 6 0C in winter, < 75% humidity). The scientifically research were realized on the Laboratory of Cell and Molecular Biology on the Faculty of Natural and Agriculture Sciences during January - March 2010. The objective of scientifically research was to observe the variations of testosterone concentration in correlation with testicular volume at Carpathian bucks. The means of testosterone concentration for all 10 bucks were increased in January and February (3,27±0,94 ng/ml vs 2,33± 0,64 ng/ml) and down immediately in March (1,06±1,14 ng/ml). Testicular volume was influenced by diet and photoperiod with significant interaction between these effects. Testicular volume on bucks was higher for January comparative with February (274 ±1,34 g vs 242,5±0,83 g). The monthly mean of testicular volume was lowest into early spring (March 199 ±0,45 g) comparative with winter months (January -February). However, changes in testicular volume (and therefore sperm production) appeared to be driven primarily by changes in the voluntary intake of feed and in growth, often independently of changes in gonadotrophin concentration. Enhanced nutrition is thus able to induce rapid testicular growth, but not increased testosterone production, during winter and spring when photoperiodic inhibition of the hypothalamo-pituitary-testicular axis is maximal.
- Subjects
ANIMAL reproduction; TESTOSTERONE; PHOTOPERIODISM; WINTER; SEASONAL effects on wildlife
- Publication
Annals of the Romanian Society for Cell Biology, 2011, Vol 16, Issue 1, p127
- ISSN
2067-3019
- Publication type
Article