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Effect of Egg Weight and Position Relative to Incubator Fan on Broiler Hatchability and Chick Quality¹

O. Elibol^* and J. Brake^,2

^* Department of Animal Science, Faculty of Agriculture, University of Ankara, Ankara 06110, Turkey; and Department of Poultry Science, North Carolina State University, Raleigh 27695-7608

² Corresponding author: jbrake{at}ncsu.edu

Two experiments, which included 3 incubators, were carried out to investigate the effects of egg weight and position relative to incubator (setter) fan on embryonic mortality, second quality chicks, and fertile hatchability of broiler eggs. Three egg weight groups termed small (~62.4 g), average (~65.4 g), and large (~68.9 g) were set in either the incubator trolley most distant from the fan (FAR) or in the incubator trolley nearest the fan (NEAR) as would be the case during single-stage operation in this type of incubator. Fertile hatchability decreased in the large egg weight group due to increased percentage late embryonic mortality in experiment 1, and both percentage early and late embryonic mortality in experiment 2. Percentage late embryonic mortality and second quality chicks increased and percentage fertile hatchability decreased for eggs in the FAR position in experiment 1 only. A significant interaction of incubator position x egg weight group for late embryonic mortality, second quality chicks, and fertile hatchability was found in experiment 1, but only late embryonic mortality was so affected in experiment 2. Experiment 2 was conducted so that eggshell temperatures could be measured. Large eggs in the FAR position at transfer time (E 18) exhibited significantly higher eggshell temperatures than did the other groups probably because air velocity or air distribution was modified in the FAR position of the incubator and large eggs were most negatively influenced in the trolley in this position.

Key Words: egg weight • incubator position • hatchability • chick quality • broiler hatching egg

¹ The use of trade names in this publication does not imply endorsement of the products mentioned nor criticism of similar products not mentioned.

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