TY  - JOUR
T1  - Effect of Season on Freezability of Semen from Two Breed-Types of Desert Sheep in the Sudan
AU - , S.A. Makawi AU - , B.A. Elsharif AU - , E.A. Babiker 
JO  - Journal of Animal and Veterinary Advances
VL  - 6
IS  - 7
SP  - 846
EP  - 849
PY  - 2007
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2007.846.849
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2007.846.849
KW  - Sheep
KW  -semen
KW  -season
KW  -freezability
KW  -breed-types
KW  -desert sheep
AB  - The objective of this study was to investigate the freezability of frozen semen collected from two breed-types of Desert sheep (Hamari and kabashi). Nine rams (6 Hamari and 3 kabashi) aged 2-4 years were used in this study to prepare a total of 293 semen ejaculates collected by means of an artificial vagina. The samples were extended in Tris-based diluent, frozen and stored in liquid nitrogen at -196&deg;C.  The date obtained revealed that, both breed-types responded equally to the effect of season. Higher percentages of sperm motility were recorded before freezing in autumn (67.07±14.40% vs. 65.42±11.17% for Hamari and Kabashi rams , respectively), while the lowest values were observed in semen samples collected in summer (55.36±7.68% vs. 59.00±5.83). However, no significant difference (p&gt;0.0.5) was found between breeds or seasons on post-thawing sperm motility, although better records were obtained in the Kabashi rams (59.00±5.83%) during Summer, compared to Hamari rams (56.96±6.48%) in the same season. A significant difference (p< 0.05) was observed between the two breed-types and season of the year on the percentage of rejected samples after freezing (15.38 vs 6.35%) with better results obtained in the Kabashi rams. However, post-freezing rejection percentage decreased during autumn and winter (5.56 and 14.29% for Hamari rams with no rejected samples for Kabashi rams). From this study, it could be concluded that, semen collected, throughout the year, from the two breed-types was suitable for freezing. The best semen quality after freezing was obtained during Autumn and Winter.
ER  -