Protease monocomponente de Bacillus liqueniformis nas dietas de frangos de corte
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2018-03-28
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Universidade Federal de Goiás
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Two experiments were carried out to evaluate the effect of the addition of 0.02% protease
enzyme (Ronozyme ProAct) on diets based on corn and soybean meal for broilers. In both
experiments, the same treatments used: T1- control ration, T2- a value of the nutritional
matrix proposed by the enzyme but without the additive, T3- twice the value proposed in T2
without enzyme, T4- T2 with enzyme, T5- T3 with enzyme. In the first experiment, to
determine the performance and yield of carcass and cuts were housed 1200 broiler chicks of
1 day of age, distributed in a completely randomized design, totaling 5 treatments, with 8
replicates and 30 birds per box. In the second experiment for the determination of
metabolizable coefficients and intestinal histomorphometry, the method of total collection of
excreta and intestinal tract collection was used in 300 chicks housed in galvanized steel cages
at 1 day of age, distributed in a completely randomized design , submitted to 5 treatments
and 6 replicates of 10 birds each. In both experiments, data analysis was perform using
analysis of variance (ANOVA). In the first experiment, when the data were statistically different
at 10% probability, they were compared by the Scott Knott Test and in the second experiment,
when the data were statistically different at 5%, they were compared by the Scott Knott Test.
In the second experiment we also performed a multivariate analysis of the main components
and estimated the Pearson correlations. Chickens fed the one valued with enzyme treatment
obtained the same final weight and weight gain as the control until 35 days of age.The birds
that received the control treatment presented higher carcass yield, and in the weight of the
cuts, there were no statistical differences between the protease treatments. Diets with
protease showed higher dry matter metabolizable coefficient and nitrogen metabolizable
coefficient, demonstrating that enzyme supplementation was effective. There was higher villus
height and villus ratio: ileus crypt in broilers fed diets supplemented with protease at 7 days
of age, however, at 21 days protease inclusion was not superior to the control treatment. A
strong positive and significant correlation was observe between metabolizable and intestinal
histomorphometry variables. Therefore, recommended to use protease in broiler diets.
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GOMIDES, L. P. S. Protease monocomponente de Bacillus liqueniformis nas dietas de frangos de corte. 2018. 68 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2018.