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The present study was conducted to evaluate the effect of glutathione (GSH) supplementation at levels of 0, 0.2, 0.4 and 0.6 mM to diluted semen stored for 0, 24, 48 and 72 h at 5°C on sperm characteristics and fertility rate (FR) of Inshas chickens. Effect of interaction between GSH level and storage period was not significant. Results revealed that progressive sperm motility (PSM), sperm livability (SL), sperm with curled tail (CT), sperm abnormality (SA) and acrosomal damage (AD) traits were improved by adding GSH to semen extender at all levels compared with no extender (control group). Semen diluted with 0.2 mM GSH showed the best results and semen without GSH supplementation (control) showed the poorest quality traits. Storage period had deleterious effect on all semen characteristics of cockerel spermatozoa. Percentages of PSM, SL and CT decreased, while those of SA and AD were increased by increasing storage period. The FR was higher for semen supplemented with 0.2 mM GSH (74.5%) than those with 0.6 mM GSH or free semen (59.9 and 59.2%, respectively). However, FR of semen extended supplemented with 0.4 mM GSH did not differ significantly when compared with other GSH levels, nor the control ones. The FR showed gradual reduction by increasing storage time, being the highest at 0 h and the lowest in semen stored for 72 h. The FR was almost higher for semen supplemented with 0.2 mM GSH and stored at each period compared with other semen treatments. In conclusion, supplementation of GSH at a level of 0.2 mM to extender of cockerel semen stored at 5°C for up to 72 h is an appropriate level to improve semen characteristics and fertility rates of Inshas chicken spermatozoa.

EFFECT OF GLUTATHIONE SUPPLEMENTATION TO SEMEN EXTENDER ON COCKEREL SPERM CHARACTERISTICS IN SEMEN STORED AT 5°C FOR DIFFERENT PERIODS