Qualidade de farelos de soja para frangos de corte suplementados com enzimas exogenas
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2021-12-07
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Universidade Federal de Goiás
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This study aimed to evaluate the apparent metabolizability coefficients of dry matter (MCDM),
nitrogen (MCN), apparent metabolizable energy (AME) and the apparent metabolizable energy
corrected for nitrogen balance (AMEn) of soybean meals (SM) supplemented with exogenous
enzymes. Three metabolism assays were carried out from 14 to 21 days, using the total excreta
collection method, with Cobb 500®male broiler chicks. In the first trial, the design used was
completely randomized (DIC), with five treatments, five replications containing eight birds per
experimental unit, totaling 160 birds. The experimental diets consisted of: Reference diet (DR); DR
+ 40% of the respective tested soybean meal (A, B, C, D). In the second trial, the design used was
completely randomized (DIC), in a 4x2 factorial scheme with eight treatments, five replications
containing eight birds per experimental unit, totaling 320 birds. Treatments consisted of: Reference
diet (RD); RD + 40% of each bran (A, B, C); with or without protease supplementation. In the third
trial, the design used was completely randomized (DIC), with nine treatments, five replications
containing eight birds per experimental unit, totaling 360 birds. The treatments consisted of using
40% of a commercial soybean meal in combination with protease, xylanase and amylase, alone or in
combination. When evaluating the quality of the different commercial soybean meal used in the
region of Goiania, significant differences were observed in the analysis of processing quality
assessment, where soybean meal A showed better protein dispersibility (PD) compared to other
soybean meal. The results of ureatic activity show that the lowest levels of ureatic activity (UA) were
observed in soybean meal B and D. In test 1, a significant effect of the different FS on AMEn was
observed, where soybean meal A and B had higher levels. of AMEn. In trial 2, the use of exogenous
protease helped to increase the levels of AME, AMEn, MCDM and MCN. In trial 3 a significant
effect on AMEn was observed, where the combinations of protease + amylase, xylanase + amylase,
protease + xylanase + amylase showed an increase in AMEn. Correlations between AME and AMEn
of broiler chickens and bromatological and quality analyzes of soybean meal processing were
performed. There were positive correlations between mineral matter (MM) and AME, AMEn, PD
and AMEn. Negative correlations were observed between MS and EMA and AMEn. It is concluded
that commercialized soybean bran may present differences in the UA or PD contents, and that there
may also be differences regarding AMEn depending on the origin. The use of enzymes such as
protease can improve both the AME and AMEn contents and the MCDM and MCN. As well as the
use of combinations of different enzymes such as protease, xylanase and amylase can improve
AMEn levels. It can be observed through correlations that factors such as DM, MM and DP can
influence the EMA and AMEn values.
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PAULO, L. M. Qualidade de farelos de soja para frangos de corte suplementados com enzimas exogenas. 2021. 53 f. Dissertação (Mestrado em Zootecnia) - Universidade Federal de Goiás, Goiânia, 2021.