Seasonal and monthly variations in semen characteristics of egyptian buffalo bulls
2009
Ramadan, T.A. | Taha, T.A. | Samak, M.A. | Hassan, A.
Monthly semen ejaculates were collected from four Egyptian buffalo bulls for 12 months in order to study their semen characteristics and the influence of season and monthly climatic conditions on the investigated characters. The relationships between the characters were also investigated Results indicated that buffalo bull libido was increased (P0.05) during the winter season as compared to other seasons. A positive (P0 05) correlation was found between temperature humidity index and reaction time. Variations in semen ejaculate volume between different seasons and months were not significant. Sperm progressive motility percentage was high (P0.05) during summer and autumn seasons and during June, October and November months. Percentages of live sperm were lower (P0.05) during spring season than during the other three seasons. The percentages of abnormal spermatozoa were lower (P0.05) during autumn and winter seasons than during the other two seasons. Semen initial fructose concentration (mg/100m1) was highest during winter and lowest during summer compared with other seasons. Sperm progressive motility(6) had a positive (P0.01)correlation with live sperm, but a negative correlation (PO.01) with dead sperm percentages. Sperm concentration had a significant (P0.05) negative correlation with percentage of sperm abnormalities
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