Influence of Monensin, Yeast, Selenoproteinand S odium Selenite Supplement on change of Offspring Sex Ratio at Birthof Sheep

The female reproductive organ and layers around the oocyst are affected by some ration ions that are able to facilitate the penetration of sperm with specific chromosome type (X or Y) and change the sex ratio in mammal offsprings. To check this, 66 Ghezel ewes,2-3 years-old and with average weight of 55±2 were chosen and all ewes were allotted randomly into six experimental groups (n=11) as follows: A; Control (only used Basal diet), B; Flushing diet, C; Flushing diet plus vitamin E plus Seleno protein, D; Flushing diet plus vitamin E plus Sodium Selenite, E; Flushing diet plus Monensin sodium, F; Flushing diet plus Saccharomyces cerevisiae yeast. The levels of serum minerals including calcium, magnesium, sodium and potassium concentrations were measured. Results showed that ewes in groups E and F had more serum calcium and magnesium compared with other groups (P<0.01) and the number of female lambs was the highest in these two groups. Ewes in group F had the lowest serum potassium and sodium and ratio of male to female lamb births (0.25) compared to other groups. This study indicated that ewes fed with Monensin and yeast (high Ca & Mg) rich ratios tended to have female progeny, also, the ewes fed with selenoprotein and sodium Selenit (high Na & K) rich ratios tended to have male progeny.