Digestibilidade de dietas com inclusão de diferentes níveis de fibra purificada para suínos em fase de crescimento

Abstract

In pig nutrition, knowledge about fiber is associated with responses regarding the characteristics and type of the fibrous source. In this sense, it is observed the importance of knowing the new sources, such as purified fibers, whose composition presents fermentable and non-fermentable compounds. The objective of this study was to determine the digestibility coefficients of dry matter (DM), crude protein (CP), ether extract (EE), mineral matter (MM), neutral detergent fiber (NDF), acid detergent fiber (ADF), crude energy (CE), as well as the digestible nutrient values of CP, EE, MM, NDF, ADF, digestible energy (DE), metabolizable energy (ME), digestible energy in natural matter (DENM) and metabolizable energy in natural matter (MEMN) of diets containing different levels of purified fiber inclusion for piglets in the growth phase. A total 20 castrated male piglets of the Topigs Norsvin® strain, with 70 days of age, distributed in a randomized block design, with 4 treatments and 5 replications each. The treatments consisted of: OPT0% diet, without inclusion of purified fiber; Diet OPT1%, containing 1% purified fiber; OPT2% diet, containing 2% purified fiber and OPT3% diet, containing 3% purified fiber. The method of total collection of feces and urine (6 days of adaptation and 6 days of collection) was used. The faeces and feed samples were submitted to laboratory analysis for the contents of DM, MM, CP, EE, NDF, ADF and CE, being obtained the digestibility coefficients, the digestible nutrients, DE, ME, DEMN and MEMN of diets. There was no significant difference (P>0.05) between the digestibility coefficients of DM, CP, MM, ADF, CE, the values of digestible nutrients of MM, NDF, ADF, CE and DE, ME, DEMN and MEMN. Diets with inclusion of 2% and 3% of purified fiber presented higher digestibility coefficient (P<0.05) of EE, followed by diet with inclusion of 1% of purified fiber, and lower value for the diet without inclusion of purified fiber. The diet without inclusion of purified fiber presented a higher digestibility coefficient of (P<0.05) of NDF, followed by diets with 1% and 2% of inclusion of purified fiber, and lower value for the diet with 3% of inclusion. The diet without inclusion of purified fiber presented the highest value (P<0.05) of digestible CP, followed by diets with 1%, 2% and 3% of inclusion of purified fiber. The diets with inclusion of 2% and 3% of purified fiber inclusion presented higher value (P<0.05) of digestible ether extract, differing from the diet without inclusion of purified fiber, which presented worse result for this variable, the diet with inclusion of 1% of purified fiber did not differ from the other diets. The increasing levels of purified fiber increase the digestibility coefficient and the digestible value of EE, but decrease the digestibility coefficient of NDF and the value of digestible protein, but do not affect the digestibility of energy, DE, ME, DEMN and MEMN up to the level of 3% inclusion in diets for pigs in the growth phase.