Abstract
The experiment was carried out to evaluate the effects of continuous ingestion of pectin on intestinal viscosity, intestinal transit time, excreta moisture content, nutrient digestibility and energy metabolism of broilers at starter and growth phases. We used 240 one-day-old Cobb male broiler chicks, distributed in a completely randomized experimental design. Treatments consisted of four concentrations of pectin (0, 10, 30 and 50 g kg-1) with six replicates of 10 birds each. The ingestion of pectin supplied in the feed by broilers at the starter phase increased intestinal viscosity and intestinal transit time, reduced excreta moisture, improved the use of apparent metabolizable energy, nitrogen-corrected apparent metabolizable energy, coefficient of apparent metabolizability, coefficient of nitrogen-corrected apparent metabolizability, apparent digestibility coefficient of crude protein and organic matter; worsened calcium utilization and coefficients of apparent digestibility of dry matter; and did not influence the coefficients of apparent digestibility of crude fat, ash and phosphorus. Pectin ingestion during the growth phase increased intestinal viscosity and apparent digestibility coefficients of ash and organic matter, but decreased the dry matter, crude fat, crude protein and calcium. Intestinal transit time, energy metabolism and apparent digestibility coefficient of crude protein showed quadratic behavior according to pectin levels in the feed. Therefore, pectin ingestion by broilers at the starter phase increases intestinal viscosity and intestinal transit time, reduces excreta moisture and improves energy utilization, whereas at the growth phase nutrient digestibility is decreased.
Highlights
Fat deposition in animals bred for meat production is an important matter for the production sector and public health, the efficient utilization of dietary soluble fibers aiming at the decrease of fat deposition has been the scope of several studies
Significant linear behavior was observed for apparent metabolizable energy (AME), apparent metabolizable energy (AMEn), apparent coefficient of metabolizability (ACM) and ACMn (P
The results indicated a quadratic effect for ADCDM and a crescent linear effect for apparent digestibility coefficient of organic matter (ADCOM) and ADCCP as a function of pectin concentration
Summary
Fat deposition in animals bred for meat production is an important matter for the production sector and public health, the efficient utilization of dietary soluble fibers aiming at the decrease of fat deposition has been the scope of several studies. Hypolipidemic, and hypoglycemic effects of the soluble fibers has been observed in studies with humans and other animals (Oliveira & Sichieri., 2004; Córdova et al, 2005; Martins et al, 2005; Ramos et al, 2007; Eufrásio et al, 2009; Pinhão et al, 2010). These effects can be related to the long surface area and the amount of hydrophilic groups of the soluble fibers, such as pectin. Non-starch polysaccharides have been correlated with the variation of nutritional values of cereal grains in experiments with domestic birds (Rowe et al, 1999), because these polysaccharides decrease the digestibility of starch, protein, fat, and mineral salts (Choct & Annison, 1990; Choct et al, 1996)
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