Banca de DEFESA: Thiago Rodrigues Cardoso Braga

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Thiago Rodrigues Cardoso Braga
DATE: 07/02/2024
TIME: 14:00
LOCAL: Plataforma Teams
TITLE:

Variation in stallion testicular measurements over a year and its influence on hormonal production and sperm quality

KEY WORDS:

hormones, sperm quality, equine, photoperiod, semen, testes 

PAGES: 60
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUBÁREA: Reprodução Animal
SPECIALTY: Ginecologia e Andrologia Animal
SUMMARY:

Although studies carried out in the Northern Hemisphere have shown variations in the stallions’ sperm quality between seasons, the same result was not found in the Southern Hemisphere. This is due to some factors, mainly the latitude where the animals are. Therefore, the aim of this research was to evaluate the influence of seasons on the variation of testicular morphometric parameters and its consequent role in hormonal production (serum cortisol, oestrogen, and testosterone values) and seminal quality parameters in stallions kept at low latitudes. Eight stallions were followed for one year, with morphometric measurements of the testes, hormonal assays and semen collections being carried out every 15 days. Semen samples were evaluated using CASA system and flow cytometry. Testicular measurements (length, width, and height) were obtained using ultrasound and radioimmunoassay was used for hormonal assays. The testicular length remained stable throughout the year, while width and height showed variations, mainly in winter (p<0.05). The morphometric measurement that presents the highest correlation with seminal quality parameters was total testicular width. Although a small variation was found in the seminal quality parameters evaluated, there was no impact on seminal quality.

COMMITTEE MEMBERS:
Presidente - 1867100 - RODRIGO ARRUDA DE OLIVEIRA
Interno - 1307139 - FABIANO JOSE FERREIRA DE SANT ANA
Externo à Instituição - CARLOS EDUARDO WAYNE NOGUEIRA - UFPel
Externa à Instituição - Mariane Leão Freitas - UNICEPLAC