Efeitos ambientais sobre a velocidade de crescimento e o diâmetro folicular de éguas
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2017-10-20
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Universidade Federal de Goiás
Resumo
Due to the current trade and technology used in equine breeding, there is a search for effective
reproductive methods, seeking to optimize the resources provided by the animal and the
environment. Hormonal mare characteristics already known and used with a positive reproductive
effect, such as the use of equine pituitary extract (EPE) to induce ovulation, may be better
employed if we eliminate the heterogenicity of the samples at the moment of collection. This
experiment was conducted with the objective of inducing estrus and ovulation in mares at the end
of the mating season, with the use of EPE collected separately at different times of the year -
summer and winter. The protocols were 14 cross bred mares, of which 7 were submitted to
treatment with EPE collected in the summer and the others with EPE collected in the winter. All of
these animals were initially treated as a control group, that is, being monitored daily for ovarian,
uterine and behavioral changes from the start of the breending season. From the beginning of
March 2017 (03/03/2017), these animals were randomly assigned to one of the treatments, which
consisted of an intramuscular application of 125 IU EPE every 12 hours, until one or more more
follicles with 34/35 mm, when each one received a single intravenous EPE application containing
500 IU to induce ovulation. The only difference between the groups was the EPE collection season.
The results obtained in this experiment allowed to conclude that the reduction of the light incidence
after the summer solstice reduces the diameter of the ovulatory follicle. In addition, EPE-summer
was more effective when used with the objective of maintaining follicular growth in mares during
the end of the breeding season, resulting in larger ovulatory follicles.
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CURADO, E. A. F. Efeitos ambientais sobre a velocidade de crescimento e o diâmetro folicular de éguas. 2017. 42 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2017.