Abstract
ABSTRACTThe aim of this study was to examine the effects of soybean meal replacement by multiple levels of raw full-fat soybean (REFS) in broiler diets on the growth performance, apparent ileal amino acids digestibility (AIAAD), intestinal histometric characteristic, pancreas weight and trypsin activity in digesta. In the experiment, in total 208 × ROSS 308 male chickens were used to examine the effect of RFFS on growth performance, AIAAD, intestinal morphology and trypsin activity in the intestinal content. Four dietary treatments were used: control group (without RFFS) and groups containing 4%, 8% and 12% of RFFS. The experiment lasted from 10th to 38th day of age. The presence of RFFS in broiler diets markedly decreased body weight and feed conversion ratio merely in group fed by 12% of RFFS in its diet. The AIAAD was lower when diets contained RFFS in all observed amino acids expect methionine. Higher AIAAD was obtained in RFFS12 in comparison with RFFS8 and RFFS4 due to a higher weight of pancreas and higher trypsin activity. Pancreas weight and trypsin activity increased with increasing RFFS in the diets. The morphology parameters villus height and crypt depth were negatively affected by the presence of RFFS.
Highlights
Soybean (Glycine max) is one of the most important components in diets for broilers, and for other animals too
In the earlier studies focused on the use of raw full-fat soybean (RFFS), negative results of broilers were found to be linked to Trypsin inhibitors (TI) impact, especially Kunitz TI (Han et al 1991; Zhang et al 1991; Chohan et al 1993)
The aim of this study was to examine the effects of soybean meal (SBM) replacement by multiple levels of RFFS in broiler diets on the growth performance, apparent ileal amino acids digestibility (AIAAD), intestinal histometric characteristic, pancreas weight and trypsin activity in digesta
Summary
Soybean (Glycine max) is one of the most important components in diets for broilers, and for other animals too. TI reduces the proteolytic action of the pancreatic enzyme trypsin and chymotrypsin (Rackis et al 1986) in the digestive tract of animals and thereby reduces the digestibility of feed protein and it is associated with growth reduction It causes hypertrophy and hyperplasia of the pancreas (Leeson & Summers 2001). There has been progress in soybean breeding with lower TI content in soybean hybrids as outcome (Bernard & Hymowitz 1986; Hymowitz 1986; Han et al 2005) These hybrids can be used to avoid the energyand cost-intensive operation needed for soybean treatment and to get better use of soy nutrients
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