107 MOTILITY PARAMETER PATTERNS OF NGUNI BULLS: EFFECT OF VARIOUS GYCEROL CONCENTRATIONS FOLLOWING CRYOPRESERVATIONT. L. Nedambale A , M. L. Mphaphathi A , P. H. Munyai A , M. Tshabalala A , P. Malusi A and A. Dinnyes B
A ARC, Animal Production Institute, GCRB, Irene, 0062;
B Biotalentum Ltd, Aulich L. 26, Godollo 2100, Hungary;
C Molecular Animal Biotechnology Laboratory, Szent Istvan University, Pater K. u. 1, 2100, Godollo, Hungary
Reproduction, Fertility and Development 22(1) 212-213 https://doi.org/10.1071/RDv22n1Ab107
Published: 8 December 2009
The Nguni breed of South Africa is small, hardy, disease-tolerant, thrives on poor pasture, and was regarded as an inferior breed in the past. For optimizing routine fresh and freezing of Nguni bull semen analysis, 3 different concentrations of glycerol (7, 10, and 14%) were examined. Ten ejaculates were collected from each 6 Nguni bulls using electro-ejaculator at ARC, Irene, South Africa. Following semen collection, semen was examined for macroscopic (volume, pH, and concentration) and microscopic (motility) parameters. The semen was extended with Tris + 10% egg yolk diluent at a ratio of 1 : 2 (v/v) and frozen at different concentrations of glycerol (7, 10, and 14%). The semen was then evaluated using the sperm class analyzer (SCA; CASA system) for progressive motility parameters. Fresh and frozen-thawed were fixed and stained with Nigrosin-Eosin for morphology (dead and live). Data were analyzed by ANOVA. There was a significant difference among individual Nguni bull spermatozoa volume and concentration. Analyzed frozen-thawed Nguni spermatozoa resulted in a significant (P < 0.05) difference of spermatozoa motility parameters frozen in 10% glycerol (68%) compared with 7 (41%) and 14% glycerol (30%). In conclusion, Nguni spermatozoa can be cryopreserved successfully when 10% of glycerol concentration is used. The results of this study will improve the viability of cryopreserved Nguni bull spermatozoa following the development of a South African semen cryo-gene bank.
This study was supported by grants from National Research Foundation (NRF), Hungarian, South African Bilateral Scientific and Technological (TETNo. OMFB-00302/2008, RT24000) collaborative project. Department of Agriculture Forestry and Fisheries (DAFF, RPPP15).