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| Author(s): |
Leonardo Willian de Freitas
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | Piracicaba. |
| Institution: | Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) |
| Defense date: | 2013-02-01 |
| Examining board members: |
José Fernando Machado Menten;
Valdomiro Shigueru Miyada;
Carla Cachoni Pizzolante
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| Advisor: | José Fernando Machado Menten |
| Abstract | |
Two experiments were conducted to evaluate the use of diets with increasing levels of biodiesel glycerin only in pre-starter (1-7 days) and only in the final phase (35-42 days of age) of broilers, respectively. The variables analyzed included the performance, carcass and parts yield, moisture retention in chicks at 7 days, litter moisture, incidence of foot pad dermatitis, plasma levels of cholesterol and triglycerides and diet cost related to weight gain. Treatments were isonutritive diets based on corn, soybean meal and corn oil containing 0, 5 and 10% glycerin. The glycerin used contained 83.6% glycerol, 11.2% water, 1.83% sodium and 397 mg/kg methanol, with estimated metabolizable energy value of 3,258 kcal/kg. In the first experiment, diets with glycerin were provided only in the pre-starter or for the entire growth period with 1610 birds in a completely randomized design with 5 treatments and 7 replications. In the first week, diets with glycerin resulted in significant improvement in weight gain and feed conversion without affecting feed intake and viability. This improvement was not sustained after 14 days of age. There was no effect of treatments on weight gain, feed intake and feed conversion. However, there was a significant reduction in viability at 35 days of age for the birds with 10% glycerin throughout the cycle, but not at 42 days; at the end of the experiment, the productivity index of this treatment was significantly decreased. Litter moisture for the treatment with 10% glycerin throughout the cycle was higher than the for the others from the 21 days, however the incidence of foot pad dermatitis was more severe for both 5% and 10% glycerin treatments for the entire period. The levels and periods of glycerin feeding did not affect carcass and parts yield and abdominal fat. In experiment II, the experimental diets were provided to 819 chickens only in the final week of growth in a completely randomized design with 3 treatments and 7 replications. The performance and feed cost per kg of weight gain were not affected by treatments. In Experiments I and II, the diets containing glycerin throughout the cycle or just in the last week resulted in no change in plasma concentrations of triglycerides and cholesterol of chickens. Diets containing 5% or 10% glycerin in the pre-starter phase or 5% glycerin continually did not affect the productivity of broilers, while the 10% level throughout the cycle was detrimental. This same level of glycerin can be used in the diet from 35 to 42 days without affecting the birds. (AU) | |
| FAPESP's process: | 11/03481-4 - Evaluation of glycerin in diets for broilers pre-starter and final phases |
| Grantee: | Leonardo Willian de Freitas |
| Support Opportunities: | Scholarships in Brazil - Master |