Rendimento de incubação de ovos de matrizes de frangos de crescimento lento
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2019-03-15
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Universidade Federal de Goiás
Resumo
Two experiments were conducted to evaluate effects of slow growing breeder age on
hatching egg quality, incubation yield, chick quality score, organ histomorphometry,
immunological quality of chicks and performance in the initial phase. The treatments were
two breeders age, 38 and 51 weeks, of Isa Label Naked Neck strain. In both experiments
a total of 630 eggs were used, distributed in three incubators (block), being 210 eggs in
each. In the egg quality study, 45 eggs per treatment were used. Eggs from breeders of
51 wk-old had greater weight and percentage of yolk, presenting even greater weight loss
until transfer. Chicks from breeders at 38 wk-old had a smaller hatch window. Breeders of
51 wk-old resulted in a better progeny, with heavier hatching chicks and better intestinal
quality. In the second experiment the treatments consisted of two ages of slow growing
matts Isa Label Naked Neck, 38 and 51 wk-old, and two hatching times, early: chicks that
hatched between 479 to 485 hours of incubation; and late: between 491 and 497 hours.
The experimente was conducted in a randomized block design in factorial scheme 2x2,
being the factors the breeder age and hatching time. A total of 384 one-day-old chicks
with an initial mean weight of 38.87 g ± 3.88 g from the incubation trial were placed in
cages for performance evaluation. Significant interaction were observed for neonate
chicken body weight, and those from young mothers hatched in early time showed lighter
weight compared to the other treatments. Broiler breeders age influenced the body weight
gain up to 21 days of age. Chicks that has hatched in the late time, had a more eficiente
use of residual yolk and greater intestinal development at 7 days of age. Chicks from
younger breeders has hatched early (479-485 h) showed the worst body weight.
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MACHADO, J. P. Rendimento de incubação de ovos de matrizes de frangos de crescimento lento. 2019. 65 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2019.