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Background: This experiment was performed to investigate the effect of humidity and egg size on the hatchability, embryonic development and chicks yield in ROSS 308 broiler breeder flock.  Methodology: The study was conducted in a completely randomized design with a 3×3 factorial arrangement. The treatments involved three levels of wet bulb humidity (°F WB) including 82, 82.5 and 83°F and three different egg sizes including small, medium or large. Results: The main effect of humidity level on the total and fertile hatchability (%) as well as the weight of one-day-old chicks were significant (P&lt;0.05). Treatment with humidity of 82.5°F enhanced total and fertile hatchability, while humidity of 83°F increased one-day-old chick weight (P&lt;0.05).A better total and fertile hatchability (%), fertility (%), chick yield (%) was observed in medium egg size group (P&lt;0.05). However, the chick weight was greater in large egg size group (P&lt;0.05). The lowest embryonic mortality was belong to medium egg size treatment (P&lt;0.05).  Conclusion: According to the results, it was concluded that humidity of 82.5°F as well as the medium egg size showed a better impact on the incubation performance.

austin journal of veterinary science and animal husbandry

Effects of Egg Size and Different Levels of Humidity during Incubation Period on the Embryonic Development, Hatching Percentage and Chicks Yield of Broiler Breeder