Desenvolvimento embrionário e eclodibilidade de ovos de codornas armazenados por diferentes períodos e incubados em umidades e temperaturas distintas

Abstract

RESUMO -Objetivou-se avaliar parâmetros relativos à incubação de ovos férteis de codornas japonesas. Os ovos foram armazenados por três períodos (0, 72 e 144 horas) e incubados em duas umidades relativas (55 e 65%) e duas temperaturas (36,5 e 37,5°C). Utilizou-se o delineamento inteiramente casualizado, em esquema fatorial 3 x 2 x 2 (período de armazenamento x umidade x temperatura). As avaliações foram feitas às 276, 324, 362 e 420 horas de incubação e no momento da eclosão. Não houve interação significativa entre as variáveis estudadas. Inicialmente, a velocidade de desenvolvimento embrionário foi influenciada pelo período de armazenamento e pela temperatura da incubadora, mas, à medida que o processo incubatório avançou, o desenvolvimento embrionário se tornou similar entre os grupos experimentais. A mortalidade embrionária foi maior, especialmente na fase precoce, nos ovos armazenados por 144 horas e naqueles incubados a 65% de umidade relativa, após a bicagem da casca pela ave. O tempo necessário para a eclosão dos ovos foi menor quando incubados a 37,7°C com 65% de umidade relativa e armazenados por períodos superiores a 72 horas. A eclodibilidade foi maior em ovos armazenados por até 72 horas. Ovos de codornas devem ser armazenados por períodos de até 72 horas e a incubação deve ser feita a 37,5°C e a 55 ou 65% de umidade relativa. Palavras-chave: embrião, Coturnix coturnix japonica, incubação Embrionary development and hatchability of quail eggs stored for different periods and incubated at different humidity and temperatures levelsABSTRACT -This study was carried out to evaluate the parameters related to hatchability of fertile eggs of Japanese quails. The eggs were stored for three periods (0, 72, and 144 hours), and incubated at two humidity (55 and 65%) and two temperatures (36.5 and 37.5°C) levels. A complete randomized design with a 3 x 2 x 2 (storage period x humidity x temperature) factorial arrangement was used. Evaluations were performed at 276, 324, 362, and 420 hours of incubation and at hatch moment. There was no significant interaction among the studied variables. Initially, the speed of embryo development was affected by storage period and hatchery temperature, but as incubation period advanced the development was similar in all experimental groups. The embryo mortality, especially in the early phase, was higher in eggs stored for 144 hours and in eggs incubated at 65% of relative humidity, after shell breaking. The eclosion was faster in eggs incubated at 37.5°C, 65% of relative humidity and stored more than 72 hours. The hatchability was higher in the eggs stored until 72 hours. Quail eggs must be incubated at 37.5°C and 55 or 65% of relative humidity and stored until 72 hours.

Storage Period Affects Weight Loss of Japanese Quail Eggs

“…Eggs lost, on average, 0.2% of their weight per day, and up to 0.5% when stored for 10 days. Pedroso et al (2006) also reported 0.2% average weight loss per day of storage at room temperature in Japanese quail eggs, and losses greater than 0.6% on 3 and 6 days of storage. Moura et al (2008) observed higher weight loss in Japanese quail eggs stored at room temperature compared with those stored under refrigeration, and increasing egg weight loss with storage period, which reached 2.67% in eggs stored for 10 days.…”

“…Fertile Japanese quail eggs producers often do not have adequate equipment and technology that allow minimal egg quality losses during storage (Pedroso et al, 2006). Considering the high demand of eggs and the factors that directly influence incubation, the gradual effect of storage on egg quality should be taken into account.…”

Incubation of Japanese Quail Eggs at Different Temperatures: Hatchability, Hatch Weight, Hatch Time and Embryonic Mortality

“…Pedroso et al (2006) found similar fertile hatchability for Japanese quail eggs incubated at 36.5°C and 37.5°C, that was 76.57% and 76.55%, respectively. The eggs incubated at 34°C were not able to hatch, however these eggs presented quail embryos that developed up to final stages.…”

“…They were staged as infertile, early death embryos (1 up to 4 days), intermediate (5 up to 15 days) and late death embryos (16 up to 18 days), according to Pedroso et al (2006).…”

Effect of breeder age and storage conditions of Japanese quail eggs on hatchability, quail neonate quality, and Bursa of Fabricius characteristics

“…In a study on hatching, Pedroso et al (2006) concluded that quail fertile eggs could be stored for a maximum of 72 h when the room temperature was 26.5 °C. Araújo et al (2015) concluded that quail fertile eggs could be stored without harming the hatch of eggs for six days at 28 °C and nine days on 14 °C.…”