Veterinary Archives, Vol. 70. No. 3, 2000.
Original scientific paper
Influence of season on seminal plasma testosterone and oestrogen in healthy and abnormal buffalo bulls and their relationship with other semen parameters.
Muhammad Tariq Javed
; Department of Veterinary Pathology, University of Agriculture, Faisalabad, Pakistan
Ahrar Khan
; Department of Veterinary Pathology, University of Agriculture, Faisalabad, Pakistan
Mumtaz Ali
; Radio-immunoassay Laboratory, Nuclear Institute for Agriculture and Biology, Faisalabad, Pakistan
Abstract
Sixteen buffalo bulls (Bubalus bubalis) were divided into four age groups, four bulls in each. Bulls in three groups had good semen quality while in one group it was poor. The study was undertaken for a one-year period divided into five seasons. The study revealed an overall seminal plasma testosterone concentration of 0.97±0.12 ng/ml. It was higher (P<0.05) in the 6-10-year-olds, less than 5 and older than in 11-year-old bulls. Testosterone showed a non significant difference between seasons. Overall seminal plasma oestrogen concentration was 43.67±7.62 pg/ml and showed a non-significant difference between healthy groups and between healthy and abnormal bulls. Oestrogen was higher (P<0.05) in winter than in other seasons in 6-10 and older than 11-year-old bulls, including abnormal bulls. Testosterone in healthy bulls showed significant positive correlation (P<0.05) with sperm concentration (r=0.223) and time between two ejaculates (r=0.242), while there was a significant (P<0.05) negative correlation with semen pH (r=-0.293). Oestrogen showed significant (P<0.01) positive correlation with semen pH (r=0.350) and negative (P<0.05) with time between two ejaculates (r=-0.296) and sperm head abnormalities (r=-0.262). Both hormones were negatively correlated (P<0.05) with each other (r=-0.277).
Keywords
buffalo bull; Bubalus bubalis; seminal plasma; testosterone; oestrogen; season
Hrčak ID:
97205
URI
Publication date:
19.6.2000.
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