Ciencias Pecuarias Vol 19 No.2.p65

Summary Two-year old and first sexual maturation male Yamú Brycon amazonicus were selected, according to the presence of semen under gentle abdominal pressure (body weight BW 1.300 ± 3 g; Total length TL 41.4 ± 0.2 cm, mean ± SEM). Five treatments were carried out: three with mGnRHa (10, 15 and 20 µg/kg in a single dose), one with carp pituitary extract CPE (4.4 mg/kg in two applications, 10 and 90 % with a 12 h interval) and a treatment control with application only of saline solution (0.9%). The volume, spermatic concentration, spermatocrit, fertility rate, percentage of live spermatozoa, motility and activation time were evaluated. The CPE caused an increase in volume, a decrease in sperm concentration and spermatocrit. A positive linear regression between the spermatocrit and the sperm concentration was found (p<0.05, r= 0.42). The fertility rate was evaluated by the ration of spermatozoa/eggs, which oscillated between 3.06 ± 0.2 x 10 5 and 6.75 ± 0,3 x 10 5 , without displaying an effect on fertility rate (p>0.05). For the other parameters evaluated, there were no differences, between the hormones utilized, or between them and the control. It was concluded that the CPE influences, the sperm fluidity, increasing the volume and decreasing the concentration, while the mGnRH-a does not cause any quantitative or qualitative changes in the yamú semen. Evaluation of milt quality of the yamú Brycon amazonicus under hormonal inductio

Original articles

Reproductive evaluation of red deer (Cervus elaphus) stags under tropical conditions ¤ Evaluación reproductiva del ciervo rojo (Cervus elaphus) macho bajo condiciones tropicales Avaliação reprodutiva do cervo rojo (Cervus elaphus) macho sob condições tropicais Summary Background: evaluation of reproductive traits of red deer is important to understand its performance. Objective: to evaluate seminal traits of red deer (Cervus elaphus) at three different stages of the breeding season (beginning, middle, and end) and to relate semen quality traits with pregnancy rate of hinds. Methods: scrotal circumference, semen volume, mass motility, individual motility, sperm concentration, morphology, and intact acrosomes were evaluated in seven stags. After evaluation, each of five stags was bred to 23 to 30 hinds. Pregnancy diagnosis was carried out using ultrasonography 45 days after the breeding season. Data were analyzed using the Student's t and chi-square tests, and simple correlation procedures. Results: scrotal circumference was reduced 5.4 cm (p<0.05) from the beginning to the end of the reproductive season, although semen volume was similar at the three different stages of the season. Sperm concentration (194 vs . 622.7/10 6 ), mass motility (1.6 vs . 2.8), individual motility (28.6 vs . 63.3%), and intact acrosome (52.7 vs . 75.5%) were greater (p<0.05) at the middle of the breeding season in comparison with values found at the beginning. Percentage of abnormal spermatozoa was similar at the beginning and middle of the breeding season (p>0.05). No spermatozoa were found in stags at the end of the breeding season. Pregnancy rates were similar among bucks (p>0.05), ranging from 80% to 91.3%, and there was no relationship between pregnancy rate and semen traits. Conclusions: there was a clear seasonality of semen traits of red deer and no relationship between semen traits and pregnancy rate