Idade da matriz e período de armazenamento de ovos incubáveis no rendimento de incubação e desempenho inicial de poedeiras comerciais
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Data
2008-05-21
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Universidade Federal de Goiás
Resumo
Two experiments have been carried out to evaluate the effect of the breeder
hen ages and of the storage period of the eggs over the incubation efficiency
and initial performance of laying hens. In the first experimental phase, 7224
Dekalb eggs with 32 and 57 weeks old, were incubated with three, five and
seven days of storage. The treatments were defined according to the breeder
hens ages and their period of storage of eggs, summing up to six treatments
with fourteen repetitions of treatment each. The statistical outline was random
and the tray height was a covariable. The efficiency of the incubation, the eggs
loss of weight during storage, the quality of incubated eggs and the absolute
weight of the yolk sac in relation to the weight of the chicken was evaluated. On
the second experimental phase, 600 chickens from the six treatments of the first
experimental phase were used. The poultry were bred up to the 28th day of life
in common batteries. The statistical outline was totally random, and the height
of the batteries was a covariable, with five repetitions of twelve birds in each
treatment. The starter performance of chicks (up to 28 days of life) was
evaluated. The results were submitted to variance analysis and to verify the
importance of differences between the average of treatments, the Tukey test
was used, with a probability of 5%. The breeder hens of 57 weeks produce
heavier eggs with a larger quantity of albumen and yolk. The old breeder hens
eggs had a lower quality of albumen when stored for seven days. The loss of
weight of the eggs during storage and removal was higher according to the
aging of the breeder hen. Eggs produced by the young breeder hens had a
higher hatching rate; however, no matter the age of the breeder hen, there was
a decrease of the hatching rate of fertile eggs whenever the storage period was
increased. The breeder hens with 57 weeks produced heavier chicks and lower
chick/egg weight coefficient. The higher ratio yolk sac/chick weight was
obtained by the eggs produced by the old breeder hens. There was a lower
weight loss of chicks from young breeder hens during the removal of incubatory
trays to the grange. The storage period did not interfere in the birds
performance and birds from old matrixes presented worse uniformity, higher
final weight and bigger food allowance
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Citação
TANURE, Candice Bergmann Garcia e Silva. Breeder hen ages and the storage period of the eggs over the incubation efficiency and starter performance. 2008. 75 f. Dissertação (Mestrado em Ciências Agrárias - Veterinaria) - Universidade Federal de Goiás, Goiânia, 2008.