Relationship between the stage of digestive tract
development in chicks and the effect of
viscosity reducing enzymes on fat digestion

Four growth experiments and a balance study were carried out to examine the effects of different fat types (beef tallow or soyabean oil) in broiler diets based on wheat, triticale, maize or barley in response to feed enzyme supplementation. Performance parameters were recorded over 35 days. Viscosity in the ileal digesta, apparent digestibility of fat and protein at the terminal ileum were measured at day 21 of age. In addition, fat digestibility was measured at the faecal level along with apparent metabolizable energy value (AME N ) and apparent net protein utilization (NPU a ).It was found that enzyme addition to all diets improved feed to gain ratio significantly. This was most visible in triticale-and barley-based diets supplemented with tallow than in the soyabean oilcontaining counterparts until 21 days of age. Effects became smaller or disappeared when the whole fattening period was considered. Significantly better performance of broilers fed soyabean oil compared with tallow-containing diets was observed over the whole fattening period.Intestinal viscosity was significantly reduced by enzyme addition to all diets. Furthermore, significantly higher intestinal viscosity was found in tallow-fed birds (triticale-, barley-or maize-based diets). Apparent protein digestibility at the terminal ileum was not affected by fat type but was FAT AND EXOGENOUS ENZYME FOR BROILER improved by enzyme supplementation in wheat-and barley-based diets. Fat digestibility at both the ileal and faecal levels was significantly higher in birds fed the soyabean oil-containing diets and was significantly improved after enzyme supplementation. The enzyme effect on fat digestibility was more pronounced at the faecal level and was positively correlated to AME N and NPU a .

Section: Discussionsupporting

confidence: 46%

“…Improvements in performance were explained by marked increases in fat digestibility. The physiological basis of such effects was reviewed by Smulikowska (1998).…”

Section: Introductionmentioning

confidence: 99%

Interactions between dietary fat type and exogenous enzyme supplementation of broiler diets based on maize, wheat, triticale or barley

Dänicke¹,

Jeroch²,

Simon³

et al. 1999

“…All plant feedstuffs contain considerable amounts of non-starch polysaccharides (NSP), lignin, oligosaccharides, which cannot be digested by endogenous mammalian enzymes. NSP, the principal component of dietary fibre (DF) and of cell walls, can affect many processes along the entire gastrointestinal tract (Low, 1985;Graham et al, 1990;Rakowska et al, 1992;Simon, 1998;Smulikowska, 1998). The physiological effects of NSP depend on their composition and physicochemical properties (e.g., solubility, water-holding capacity, fermentability).…”

Section: Introductionmentioning

confidence: 99%

Fibre components negatively affect ileal protein digestibility in pigs

Buraczewska¹

2001

“…Part of this effect may be explained by better supplementary fat digestibility and absorption, or increased availability of fatty acids for deposition into adipose tissue, when ileal digesta viscosity is reduced by feed enzymes (Annison, 1995;Smulikowska, 1998).…”

Section: Discussionmentioning

confidence: 99%

Effect of changes in live body weight and feed conversion ratio as inﬂuenced by enzyme supplements on basic post-slaughter measurements of broiler chickens fed cereal-based diets

Szczurek¹,

Koreleski²

2002

The present work was designed to clarify the relationship between carcass yield (CY) and abdominal fat (AF) percentages with changes in final live body weight (LBW) and feed conversion ratio (FCR) in broilers as caused by supplementary feed enzymes. The experimental data set was obtained from a total of eleven growth trials carried out with chickens of currently used commercial strains. In all of the trials the chickens were fed ad libitum with mash diets based on home-grown cereals and soyabean meal, and containing fat additions, mainly as animal blended fat. Different commercial enzyme preparations were added to the diets either alone or in combination. The mean responses to enzymes were +86 g for final LBW, -0.08 g/g for FCR, +0.031% for CY and +0.024% for AF. For main (Pearson) correlation assessments and (linear) regression analysis, the observed values obtained with birds fed enzyme preparations were expressed relative to the data of control birds fed unsupplemented diets (= 1.00). No correlation could be established between enzyme-caused relative changes in: LBW and CY, FCR and CY, and FCR and AF. A highly significant positive correlation was found between relative changes in final LBW of chickens and relative percentage of AF. For this relationship the regression equation was: Y AF =-2.882+ 3.735X LBW , (R 2 = 0.529, P<0.001). It was concluded that augmented abdominal fat accumulation in broilers fed enzyme preparations can be avoided by lowering the quantity of animal fat added to the cereal diets to meet the energy needs of the chickens.