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Endocrinal parameters of two sexual hormones [luteinizing hormone (LH) and testosterone] were studied in three Tuareg rams and two bicolor Peul rams during April and October 1997. Blood samples were collected at 15 min intervals from 1h00 to 7h00 AM. Means (± standard error) obtained for the various parameters studied in Peul and Tuareg rams were as follows, respectively: basal levels of testosterone 4.17 ± 1.82 and 4.55 ± 2.71 ng/ml, and LH 0.80 ± 0.13 and 0.96 ± 0.33 ng/ml; peaks of testosterone 10.16 ± 3.11 and 11.09 ± 2.82 ng/ml, and LH 1.75 ± 0.90 and 2.65 ± 1.29 ng/ml; duration of peaks of testosterone 85 ± 18.7 and 88.63 ± 27.47 min, and LH 75 ± 23.71 and 61.87 ± 24.23 min; frequency of peaks of testosterone 2.38 ± 1.3 and 2.03 ± 1.2 peaks/6h, and LH 1.08 ± 0.15 and 1.85 ± 0.97 peaks/6h. Time intervals between the peak of LH and the first significant rise of testosterone were 26.25 ± 6.49 and 31.87 ± 15.79 min, respectively. The only significant (p 0.05). The duration of the peak of LH was significantly affected by the season (p < 0.05), whereas the other parameters were not. Parallel evolutions of the basal levels of testosterone and LH during both seasons highlighted the interaction between the two hormones.

Paramètres de l'endocrinologie sexuelle des béliers Peuls et Touaregs : influence du type génétique et de la saison