Opposite variations of two epididymal components and blood plasma testosterone in two breeds of rams
| Autor: | Roland R. Tremblay, P. Demers, J. Besancon, J.P. Lemay |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Male
Periodicity medicine.medical_specialty Testicular volume media_common.quotation_subject Semen Biology Testicle Animal science Species Specificity Carnitine Internal medicine Testis Blood plasma medicine Animals Testosterone media_common Epididymis Sheep Reproduction alpha-Glucosidases General Medicine Sperm Endocrinology medicine.anatomical_structure Seasons |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Physiology. 99:173-177 |
| ISSN: | 0300-9629 |
| DOI: | 10.1016/0300-9629(91)90254-a |
| Popis: | 1. Testicular volume (T Vol), blood plasma testosterone (T) concentration, seminal plasma alpha-glucosidase (alpha-G) specific activity, L-carnitine (L-C) concentration as well as semen characteristics were compared in eight Finnish Landrace (F) and eight Suffolk (S) rams throughout 21 months. 2. Only T Vol and T exhibited a typical seasonal variation in both breeds, whereas L-C, alpha-G and live sperm output presented a seasonal profile only in S rams. 3. L-C and alpha-G variations were opposite to those of T in S rams, while they fluctuated in F rams throughout the entire experiment, as did live sperm output. 4. Only the number of ejaculates and T were significantly higher in F rams (3.50 +/- 0.08 in 5 min and 7.62 +/- 0.40 ng/ml) than in S rams (2.30 +/- 0.05 in 5 min and 5.5 +/- 0.30 ng/ml); these two characteristics might therefore be considered as two indexes of sexual activity in rams. 5. By contrast, among all characteristics measured, only alpha-G was significantly higher in S rams than in F rams (1.33 +/- 0.04 vs 0.77 +/- 0.03 mU/mg proteins); this result, as well as seasonal alpha-G profile present in only S rams, allowed us to conclude that alpha-G might be considered as an additional index of seasonal reproduction in rams. |
| Databáze: | OpenAIRE |
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