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| Author(s): |
Maicon Sbardella
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: | 2011-07-18 |
| Examining board members: |
Valdomiro Shigueru Miyada;
Jose Eurico Possebon Cyrino;
Gustavo Julio Mello Monteiro de Lima
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| Advisor: | Valdomiro Shigueru Miyada |
| Abstract | |
The purpose of the inclusion of oils in weanling pig diets is to increase diet energy density to meet energy requirement of pigs. Two experiments were conducted to evaluate the effects of the inclusion of semi-refined rice oil replacing refined soybean oil in diets of weanling pigs. Experiment 1 was carried out to determine digestible and metabolizable energy values of rice and soybean oils for weanling pigs. Twenty one borrows averaging 19.63 ± 0.37 kg BW were used in a randomized complete block design experiment, with seven replications and one pig per experimental unit (metabolism cage). Total collection method of feces and urine was used, and the oil replaced 10% of reference diet. Values of digestible energy, metabolizable energy and N-corrected metabolizable energy were, respectively, 6,267, 6,158 and 6,213 kcal/kg for semi-refined rice oil and 7,581, 7,489 and 7,527 kcal/kg for refined soybean oil. Energy values of rice oil were around 17.5% lower than values of soybean oil, possibly, due to the smaller unsaturated:saturated fatty acids ratio and due to the higher free fatty acids content in the semi-refined rice oil. Experiment 2 was conducted to evaluate the effects of the replacement of refined soybean oil (SO) by semi-refined rice oil (RO) in weanling pig diet on performance, intestinal histology, organs morphometry and the occurrence of diarrhea. One hundred and twenty weaned pigs, borrows and females, averaging 6.74 ± 0.42 kg BW, were used in a randomized complete block design experiment, with eight replications per treatment and three animals per experimental unit (pen). Five dietary levels of SO:RO replacement were studied: 4:0 basal diet with 4% of SO; 3:1 basal diet with 3% of SO and 1% of RO; 2:2 basal diet with 2% of SO and 2% of RO; 1:3 basal diet with 1% of SO and 3% of RO; and 0:4 basal diet with 4% of RO. Isonutritive diets were formulated considering N-corrected metabolizable energy values determined in Experiment 1. No effects of substitution levels were observed on performance, organs morphometry and occurrence of diarrhea. However, a quadratic effect on villus width and a cubic effect on villus height:crypt depth ratio were observed in the duodenum. Therefore, considering the energy values of oils in the formulation of isonutritive weanling pig diets, semi-refined rice oil can replace the refined soybean oil (4%) without affecting growth performance, organs morphometry of animals, or the occurrence of diarrhea. (AU) | |
| FAPESP's process: | 09/12662-2 - Rice oil in the feeding of weanling pigs |
| Grantee: | Maicon Sbardella |
| Support Opportunities: | Scholarships in Brazil - Master |