Título:	Effects of different egg turning frequencies on incubation efficiency parameters
Autor(es):	Oliveira, Gabriel da Silva Santos, Vinícius Machado dos Rodrigues, Jullyana Carvalho Nascimento, Sheila Tavares
Assunto:	Frango de corte Frango de corte - embrião - mortalidade Ovos - incubação
Data de publicação:	Set-2020
Editora:	Elsevier Inc. on behalf of Poultry Science Association Inc.
Referência:	OLIVEIRA, Gabriel da S. et al. Effects of different egg turning frequencies on incubation efficiency parameters. Poultry Science, v. 99, n. 9, p. 4417-4420, set. 2020. DOI: https://doi.org/10.1016/j.psj.2020.05.045. Disponível em: https://www.sciencedirect.com/science/article/pii/S0032579120303576?via%3Dihub. Acesso em: 26 nov. 2020.
Abstract:	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 (Carijó Pesadão) 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°, 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.
Unidade Acadêmica:	Faculdade de Agronomia e Medicina Veterinária (FAV)
Licença:	This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
DOI:	https://doi.org/10.1016/j.psj.2020.05.045
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