Vinagre pirolenhoso de Eucaliptus sp. como alternativa antimicrobiana na dieta de frango de corte
Brazil is the second largest producer of poultry since 2015, with an annual production of 12 million tons and the first largest exporter in the world, exporting to 155 countries. Significant part of this production is assured by the use of antibiotic growth promoters (AGPs), banned in the main wo...
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| Formato: | Dissertação |
| Idioma: | por |
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| Acceso en liña: | https://repositorio.ufrn.br/jspui/handle/123456789/26324 |
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| Resumo: | Brazil is the second largest producer of poultry since 2015, with an annual production of
12 million tons and the first largest exporter in the world, exporting to 155 countries.
Significant part of this production is assured by the use of antibiotic growth promoters
(AGPs), banned in the main world markets, for promoting bacterial resistance and its
residual effect. These phenomena are presumed to be at the origin of the emergence of
super-resistant bacteria, which nullify the effects of drugs used in human medicine, thus
constituting a serious threat to public health. This reality has stimulated the search for
AGPs alternative to the use of antibiotics. The objective of this study was to evaluate
the effect of different levels of wood vinegar (WV) use as a growth promoter alternative
to conventional antibiotic use (enramycin). A total of 504 one-day-old Cobb 500
pedigree broilers distributed in a completely randomized design were used in seven
treatments (0, 0.5, 1.0, 1.5, 2.0, 2.5 % of WV and 115 ppm of enramycin), with six
replicates and 12 birds per plot. The following variables were evaluated: weight gain,
final weight, feed intake and feed conversion in the stages of 1-21 and 1-42 days of age.
In the analysis of orthogonal performance contrast in phase 1-21 and 1-42 days there
was difference (P <0.05) in the feed consumption between the negative control vs WV,
and the worst consumption was observed in the animals submitted to WV treatment.
The worst feed conversion was observed with WV in the 1-42 day age group. In the
other performance variables, no differences were observed in the orthogonal contrasts
nor in the polynomial regression analysis. In the weight of cuts, organs, intestine length
and carcass yield in animals slaughtered at 21 days of age there was no difference in the
analysis of orthogonal contrasts, except for breast weight and breast yield. There is no
effect of WV on polynomial regression analysis in all variables studied. The same
variables at 42 days of age showed a quadratic effect on the carcass yield in the
polynomial regression analysis, where the level 1.9 of the WV was the inflection point.
The other variables had no effect. In relation to the morphometric analysis, only the
duodenum at 21 days of age and ileum at 42 days of age showed a linear increasing
effect (P> 0.05). In view of the observed results, it is concluded that the WV promotes
better feed conversion of broiler chickens from 1 to 42 days of age. The level of 1.9% of
VP improved the carcass yield of chickens at 42 days of age. |
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