الفهرس 
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Abstract
The current study included two experiments done simultaneously at the same time, the first experiment aimed to study the effect of post-breeding supplementation of P4. The second experiment aimed to study the effect of peri-breeding feeding on fatty acids supplemented diets on CR.
The results of the present study showed that direct post-breeding P4 supplementation resulted in significant (p<0.05) decrease in the CR either in G1B (5.9%) or G2B (6.7%) compared with control (62.5%) although there was significant increase in the serum P4 concentration on Day3 and 8 in G1B (1.70 ± 0.77 and 2.69± 0.46 ng/ml) and G2B (1.75± 0.37 and 2.87 ± 0.55 ng/ml) compared with control (1.43± 0.47 and 2.13± 0.48 ng/ml) on Day 3 and 8 respectively. On the other hand, the peri-breeding supplementation of fatty acids supplemented diets resulted in significant (p<0.05) increase in the CR (75 GF vs 62.5 in control).