Exposição de ovos de matrizes pesadas à luz monocromática durante a incubação artificial
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2017-06-01
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Universidade Federal de Goiás
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Two experiments were conducted at North Carolina State University to elucidate the hypothesis
that exposing broiler embryos to monochromatic lights during incubation period may influence
embryonic growth and development, improving incubation traits and posthatching period. In the
first experiment, intermittent green light, continuous green light, intermittent red light and dark
were evaluated. In addition, the influence of egg position in the tray was also tested. In the second
experiment, monochromatic green light exposure was evaluated during different phases of
incubation period. Treatments were: 1) 21d of incubation in the dark; 2) 21d of incubation with
green light; 3) dark until E5 and continuous green light until hatch; 4) continuous green light until
E5 and dark until hatch; 5) dark until E18 and continuous green light until hatch; 6) continuous
green light until E18 and dark until hatch. Machine temperatures were adjusted daily in order to
obtain optimal eggshell temperature (99,5 a 100,4°F) during the whole incubation period. In the
first trial, embryo mortality in intermediate phase was higher in the group exposed to intermittent
green light. Relative proventriculus weight was influenced by light stimuli, and the group that was
not exposed to light showed the greatest organ development. Feed intake was also influenced by
light treatments at 21 d of age. In the second trial, exposing embryos to continuous green light at
different moments during incubation period affected the percentage of hatch and hatch of fertile.
In addition, dead pipped was higher in the group exposed to light until E18. Liver weight was
higher in chicks incubated in the dark during 21 d. Feed conversion ratio at 35 and 42 days was
also influenced by light treatments, and the group that was not exposed to light during the whole
incubation period had the lower feed conversion ratio. Significant interaction was observed
between light stimuli and sex for breast yield. Male chicks that were light stimulated until E18 had
the lowest breast yield. Comparing sexes, the highest breast yield was observed for females that
were light stimulated until E18 during incubation. In conclusion, with incubation conditions that
were established during the experiments, exposing broiler embryos to monochromatic lights did
not promote benefits in incubation traits and also did not influenced chick growth and development
in posthatching period.
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MESQUITA, M. A. Exposição de ovos de matrizes pesadas à luz monocromática durante a incubação artificial. 2017. 74 f. Tese (Doutorado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2017.