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

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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.