Influence of heating and storage times of the broiler breeders fertile eggs on hatchability and day-old chicks characteristics / Influência dos tempos de aquecimento e armazenamento de ovos férteis de reprodutoras pesadas sobre a eclodibilidade e características de pintos de 1 dia

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

An experiment was carried out to evaluate the influence of different heating times before storage and different storage times of the fertile eggs from Cobb 500 broiler breeders, aged 44 weeks, before incubation on hatchability and day-old chicks characteristics. The experimental design was randomly assigned in a 3x3 factorial scheme: egg heating before storage (37ºC for 0, 6 and 12h) and egg storage before incubation (12ºC for 4, 9 and 14 days), totalizing nine treatments with 22 replicates of ten eggs each. The incubation procedure was the same used by the poultry industry. It was evaluated the hatchability characteristics (480 and 498h), day-old chick weight, egg weight loss during heating and storage, superficial eggshell temperature, and intestine morphologic and histological characteristics. The heating time of 6h did not impair hatchability of the eggs when compared to the control treatment (no heating 0h). On the other hand, heating eggs for 12h was observed significantly reduction of the hatchability. Day-old chicks weight was not influenced by the storage time, however, the eggs heated for 0 and 6h provided heavier day-old chicks than eggs heated for 12h. There were not influences of the treatments on intestine villous characteristics, except for crypt height. It was concluded that the pre-incubation fertile eggs heating at 37ºC for 6h is adequate to maintain normal rates of hatchability without impair day-old chicks characteristics when eggs are stored up to four days.

ASSUNTO(S)

eclosão incubation villous heating aquecimento storage vilosidades armazenamento incubação hatchability

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