부산대학교 도서관

The present study was undertaken to evaluate the effect of seasonal variations on various seminal attributes and freezability of Hariana bull semen. The study was conducted over a period of four months and divided into two peak seasons as winter (December-January) and summer (May-June). Twenty-four ejaculates were collected from 4 bulls in each season. The physico-morphological characteristics of semen, viz., volume (ml), mass activity (0-5 scale), pH, sperm concentration (million/ ml), progressive motility (%), sperm livability (%), HOST (%), total morphological sperm abnormality (%) and acrosomal integrity (%) were estimated at different stages of cryopreservation in different seasons. During summer season the ejaculate volume and seminal pH were found non-significantly higher than in winter, whereas the percentage of morphologically abnormal spermatozoa was significantly (p<0.05) higher in summer. Postthaw percentage of progressively motile spermatozoa was significantly (p<0.05) higher in winter than summer season. Live sperm per cent were significantly (p<0.05) higher in winter than summer season both at fresh and pre-freeze stage. HOST positive sperm and acrosomal integrity were significantly (p<0.01) higher in winter season than summer at all three stages. The study generated basic information that the summer season adversely affects the various physico-morphological characteristics of Hariana bull semen altering its freezability. [ABSTRACT FROM AUTHOR]