Navegando por Autor "Mesquita, Mariana Alves"

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    Resultados produtivos no incubatório e na granja de frangos de corte utilizando sistema de incubação em estágio múltiplo e estágio único
    (Universidade Federal de Goiás, 2013-04-02) Mesquita, Mariana Alves; Gonzales, Elisabeth; http://lattes.cnpq.br/5436760646498130; Leandro, Nadja Susana Mogyca; http://lattes.cnpq.br/3136809931691012; Arnhold, Emmanuel; http://lattes.cnpq.br/7156945506134934
    The aim of this study was to compare the incubation systems in multiple stage and single stage, by evaluating the performance of the incubation process and the production performance of broilers originated from embryonated eggs incubated in the both systems. To evaluate the yield of incubation five experiments were performed, using eggs of Cobb broiler breeders. Each test was divided into two phases. In the first experimental phase, eggs weight, chicks weight, residual yolk weight, length and quality score of the chicks were analyzed using randomized block design with two treatments (single stage and multiple stage), and with blocks being each experimental trial. In each test, 140 eggs and all the chicks borned from those eggs from each treatment were assessed (experimental unit). In the second phase of the trial, a total of 25.360 eggs and was incubated and spread on trays for analysis of hatchability, hatch window, birth distribution and embryo diagnosis. For hatchability data and hatch window, a randomized block design in a 2x3 factorial arrangement (two incubation systems and three positions of the trays into the incubation machine) was used. The repetitions were composed by the trays, totaling 285. For the results of embryo diagnosis all unhatched eggs from 285 selected trays were evaluated. The productive performance was evaluated until 35 days of age by means of a completely randomized 2x2 factorial arrangement (chicks from two stages of incubation and both sexes), with six replicates. Each experimental unit consisted of 25 birds, totaling 600 birds. We concluded that incubation of fertile eggs from Cobb 500 broiler breeders in single stage machines enables to obtain better productivity of the hatchery than incubation in multiple stage machines, as a result of higher hatchability and better neonate quality. The productive performance of broiler up to 35 days of age was not affected by the type of machine used for incubation.
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    Exposição de ovos de matrizes pesadas à luz monocromática durante a incubação artificial
    (Universidade Federal de Goiás, 2017-06-01) Mesquita, Mariana Alves; Oviedo-Rondón, Edgar Orlando; Café, Marcos Barcellos; http://lattes.cnpq.br/9860968235125158; Café, Marcos Barcellos; Tanure, Candice Bergmann Garcia e Silva; Minafra, Cibele Silva; Moraes, Dunya Mara Cardoso; Mello, Heloísa Helena de Carvalho
    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.