Activity of supplemental enzymes and their effect on nutrient utilization and growth performance of growing chickens as affected by pelleting temperature

• Published in: Archiv für Tierernährung 2000-01, Vol.53 (1), p.45-58
• Main Authors: Samarasinghe, K, Messikommer, R, Wenk, C
• Format: Article
• Language: English
• Subjects: ACTIVIDAD ENZIMATICA; ACTIVITE ENZYMATIQUE; ALIMENT POUR ANIMAUX; Amylases - metabolism; Animal Feed; Animal Nutritional Physiological Phenomena; Animals; AZOTE; beta-Glucosidase - administration & dosage; beta-Glucosidase - metabolism; Body Weight; BROILER CHICKENS; broiler chicks; Calorimetry - veterinary; CELLULASE; Cellulase - administration & dosage; Cellulase - analysis; Cellulase - metabolism; CELULASA; Chickens - growth & development; Chickens - metabolism; CHICKS; CRECIMIENTO; CROISSANCE; EFFICACITE ALIMENTAIRE; EFICIENCIA DE CONVERSION DEL PIENSO; Endo-1,4-beta Xylanases; Endopeptidases - metabolism; ENERGIA; ENERGIE; ENERGY; ENZYME PREPARATIONS; enzyme supplementation; ENZYMIC ACTIVITY; Feces - chemistry; FEED CONVERSION EFFICIENCY; FEED INTAKE; FEEDS; Food, Fortified; GAIN DE POIDS; GANANCIA DE PESO; Glucan 1,3-beta-Glucosidase; GRANULOS COMPRIMIDOS; GROWTH; INGESTION DE PIENSOS; Male; Multivariate Analysis; NITROGEN; Nitrogen - analysis; NITROGENO; PELLET; Pelleting temperature; PELLETS; PIENSOS; POLLITO; POLLO DE ENGORDE; POULET DE CHAIR; POUSSIN; PREPARACION ENZIMATICA; PREPARATION ENZYMATIQUE; PRISE ALIMENTAIRE (ANIMAUX); PROCESAMIENTO; PROCESSING; Random Allocation; TEMPERATURA; TEMPERATURE; TRAITEMENT; VISCOSIDAD; VISCOSITE; VISCOSITY; WEIGHT GAIN; Xylosidases - metabolism
• ISSN: 0003-942X
• DOI: 10.1080/17450390009381937

Activity of supplemental enzymes in a barley-soybean-maize based diet at 60, 75 and 90°C pelleting temperatures was studied using feed viscosity, in-vitro enzyme activity and broiler performance data. High pelleting temperatures increased feed viscosity but supplemented enzymes reduced the viscosity at all three temperatures levels by 11, 14 and 17%, respectively. Water intake and losses in excreta of birds were found to be affected by feed viscosity. Activity of cellulase enzyme, measured using the radial diffusion method, was unaffected at 60 and 75°C, but reduced by 73% in feed processed at 90°C. Enzymes increased the weight gain of broilers by 11.1% at 90°C, but no effect could be seen at low pelleting temperatures possibly due to high dietary protein and energy contents. Feed intake was unaffected by enzymes. Birds consumed 6% more feed and grew 9% faster when the pelleting temperature was increased from 60 to 75°C. Reduced feed intake and daily weight gain observed at 90° C could be fully compensated by the enzyme supplementation. High pelleting temperature reduced energy metabolizability (3.2%) and nitrogen utilization (4%) but enzyme almost compensated them (by 3.3% and 2.6%, respectively). No interaction could be detected between the pelleting temperatures and enzymes. It is concluded that pelleting temperatures as high as 90°C drastically reduce cellulase activity, energy and nitrogen utilization thus lowering broiler performance. Either the remaining activity of cellulase or other thermostable enzymes can prevent the losses.