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| Author(s): |
Teresa Cristina de Freitas Carlos
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Pirassununga. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina Veterinária e Zootecnia (FMVZ/SBD) |
| Defense date: | 2012-12-17 |
| Examining board members: |
Lúcio Francelino Araújo;
Ricardo de Albuquerque;
Evandro de Abreu Fernandes
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| Advisor: | Lúcio Francelino Araújo |
| Abstract | |
We developed three experiments to evaluate a mixture of herbal extracts of oregano, pepper and cinnamon in the production of broilers: Experiment I - was used 320 male chicks from one day old Cobb 500, distributed in completely randomized design with four treatments (0, 75, 150 and 225 ppm of plant extracts) with ten replicates of eight birds each, created up to 21 days to determine the nutrient digestibility of diets, the collection methodology of the ileal content. Experiment II - was used 600 male chicks from one day old Cobb 500, distributed in completely randomized design with five treatments (Positive Control (PC) with 54 ppm Bacitracin Zinc; Negative Control (NC) without enhancing additives performance; CN with the addition of 75 ppm, 150 ppm and 225 ppm of plant extracts) with ten replicates of twelve chicks each to assess performance and carcass characteristics. Experiment III - was used 600 male chicks from one day old Cobb 500, distributed in completely randomized design with five treatments (Positive Control (PC) with 54 ppm Bacitracin Zinc; Negative Control (NC) without enhancing additives performance; CP up to 33 days and subsequently replaced by CN, from 34 to 42 days of age, with the addition of 75 ppm, 150 ppm and 225 ppm plant extracts), with ten replicates of twelve chickens each for performance evaluation and characteristics. All data were analyzed using Statistical Analysis System (SAS Institute Inc., 2008), submitted to polynomial regression analysis by GLM procedure at the 5% level of significance. In the first experiment, no significant effect was observed between treatments for ileal digestibility of raw energy and ileal digestibility of crude protein and amino acids showed a quadratic effect (P <0.05). In experiment II feed intake had no significant effect between treatments, as for weight gain and feed conversion was no significant effect (P <0.05) in the comparison between the antibiotic and the levels of plant extracts added to the diet. In experiment III, no significant effect was observed between treatments for feed intake and weight gain, feed conversion but significant effect (P <0.05) in the comparison between the antibiotic and the levels of plant extracts added to the diet. In experiments II and III, for carcass traits were not significant effects (P <0.05) among treatments. It was concluded that the inclusion of a mixture of herbal extracts of oregano, pepper and cinnamon in the diet of broilers in place of performance enhancing additives provided higher ileal digestibility of crude protein and amino acids, and according to the levels prevailing, vegetable extracts yielded no positive effect on performance when compared with the antibiotic treatment, the total periods. However, the provision in the final phase showed a different behavior by improving the yield of breast. (AU) | |
| FAPESP's process: | 10/13540-5 - Evaluation of plant extracts on broilers production |
| Grantee: | Teresa Cristina de Freitas Carlos |
| Support Opportunities: | Scholarships in Brazil - Master |