Journal
POULTRY SCIENCE
Volume 99, Issue 9, Pages 4417-4420Publisher
ELSEVIER
DOI: 10.1016/j.psj.2020.05.045
Keywords
broiler breeder; embryo mortality; hatching result; turning frequency; viability
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Funding
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
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This study aimed to evaluate the effects of different egg turning frequencies on incubation efficiency parameters. Nine hundred sixty brown fertile eggs, with an average weight of 52.20 +/- 0.85 g, from 38-week-old CJD (Carijo Pesadao) breeder hens were randomly distributed among 4 treatments before incubation. Each treatment corresponded to a turning frequency, being 24 (control), 12, 6, or 3 times per day, at an angle of 45 degrees, until day 18 of incubation. The experimental design was a randomized complete block design with 4 treatments. Analysis of the incubation parameters was based on 6 replications per treatment. The eggs that were turned 12, 6, and 3 times per day exhibited a decrease in hatchability of the fertile eggs of 6.61, 15.51, and 19.70%, respectively, when compared with the control group (91.84 +/- 2.73%). With a decrease in turning frequency, there was a gradual increase in early (2.84 +/- 1.89 to 14.31 +/- 1.82%) and late (3.57 +/- 1.39 to 8.05 +/- 1.24%) mortality rates. An egg turning frequency of 24 times per day during incubation provided high hatchability rates. In contrast, the turning frequencies of 12, 6, and 3 times per day showed significant losses in hatchability.
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