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Serum and seminal thyroid hormones in relation to semen quality of Friesian bulls
Veterinary Medical Journal. 1991; 39 (1): 157-67
em Inglês | IMEMR | ID: emr-115753
ABSTRACT
Serum and seminal levels of thyroxine [T[4]] and triiodothyronine [T[3]] were evaluated and correlated with the semen quality of two groups of Friesian bulls. The first group [I] was of high semen quality while the second [II] represented bulls of moderate quality. Obtained data clarified that serum T[4] and T[3] levels were significantly higher in bulls of group I than those of group II. Serum T[4]/T[3] ratio was nearly similar in both groups. Seminal plasma T[3] contents of group I were higher than their corresponding values of group II, while T[4] concentrations of the second group were sharply greater than those of the first group. It was concluded that a reverse relationship is found between seminal T[4]/T[3] ratio and semen quality. T[3] has the upper hand in regulating semen activity. Decreased conversion of T[4] into T[3] in semen leads to an imbalance among both hormones which could be considered as a factor responsible for inhibited sperm activity
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Índice: IMEMR (Mediterrâneo Oriental) Limite: Animais Idioma: Inglês Revista: Vet. Med. J. Ano de publicação: 1991

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Índice: IMEMR (Mediterrâneo Oriental) Limite: Animais Idioma: Inglês Revista: Vet. Med. J. Ano de publicação: 1991