D. Abadjieva; M. Chervenkov; R. Stefanov; N. Metodiev; E. Kistanova; D. kacheva;\u00a0and E. Raycheva<\/p>\n
Bulgarian Academy of Sciences, Institute of Biology and Immunology of Reproduction, BG – 1113 Sofia, Bulgaria;\u00a0Institute of Animal Science, BG – 2232 Kostinbrod, Bulgaria<\/em><\/p>\n The aim of this study was the investigation of the breeding season effect on the kinematic and main spermatological\u00a0parameters of the rams from Synthetic Population Bulgarian Milk sheep breed (SPBM), new Bulgarian breed certifiated in 2005. The experiment was carried out with seven rams. Two consecutive ejaculates from each ram were obtained by artificial\u00a0vagina before and during the breeding campaign (n=28). Overall sperm motility and the individual kinematic parameters of\u00a0motile spermatozoa were assessed by the computer-aided sperm analysis system Sperm Class Analyzer (SCA). The sperm\u00a0morphology was estimated after sperm blue stain and calculated as a percent of abnormal cells among 100 sperm cells from\u00a0several filds on the slide.<\/p>\n It was found that the ejaculates obtained from SPBM rams during the breeding season had better features of sperm motion\u00a0kinetics. The values of the velocity parameters (P< 0.05), motility (P< 0.05), and percentages of spermatozoa with rapid\u00a0(P< 0.01) and medium (P< 0.001) speed were higher than those from the ejaculates collected before the breeding season. Minor\u00a0and not signifiant changes in the kinematic parameters of motile spermatozoa in consecutive ejaculates were observed. No\u00a0signifiant differences were established in morphological status of spermatozoa in nonbreeding and breeding season. It seems\u00a0that the better sperm motility kinematic parameters during the breeding season ensure the higher sperm fertility and success\u00a0on the future insemination.<\/p>\n Bulgarian Journal of Agricultural Science, 20 (No 4) 2014, 967-972<\/p>\n","protected":false},"excerpt":{"rendered":"