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Effect of Egg Turning Angle and Frequency During Incubation on Hatchability and Incidence of Unhatched Broiler Embryos with Head in the Small End of the Egg¹

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

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

² Corresponding author: jbrake{at}ncsu.edu

The effect of turning angle (from vertical) and the interaction with turning frequency during incubation on fertile hatchability, embryonic mortality, and the incidence of embryos with head in the small end of the egg (malpositioned) was studied in 2 experiments comprising 2 trials each to determine if a turning angle of less than 45° could be successful. Hatching eggs from commercial broiler breeder flocks from 55 to 61 wk of age were utilized, and turning was for 18 d. Eggs were subjected to turning angles of 35, 40, or 45°, with a turning frequency of 24 times daily (24x) in Experiment 1. Turning angle had no effect on fertile hatchability. However, the incidence of separately enumerated, malpositioned embryos was increased by the 35° angle, compared with both the 40 and 45° angles in Experiment 1. Eggs were subjected to turning angles (from vertical) of 35°, with a turning frequency of either 24x or 96x daily, or 45°, with 24x turning in the 2 trials of Experiment 2. Turning angle and frequency had no effect on fertile hatchability or embryonic mortality, but the incidence of separately enumerated, malpositioned embryos was increased by the 35° angle with 24x turning, compared with the 35° angle with 96x turning, and the 45° angle, with 24x turning, in Experiment 2. These data demonstrated that the incidence of malpositioned embryos was increased by a reduced turning angle, but that this effect was ameliorated by a concomitant increase in turning frequency.

Key Words: turning angle • turning frequency • hatchability • malposition • 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.

This article has been cited by other articles:

				O. Elibol and J. Brake Effect of Egg Position During Three and Fourteen Days of Storage and Turning Frequency During Subsequent Incubation on Hatchability of Broiler Hatching Eggs Poult. Sci., June 1, 2008; 87(6): 1237 - 1241. [Abstract] [Full Text] [PDF]