Klinoptilolit ve/veya Fitaz İlavesinin Broilerlerin Büyüme Performansı, Karkas Karakteristikleri, Bağırsak Histomorfolojisi ve Tibia Kalsiyum ve Fosfor Düzeylerine Olan Etkisi

Abstract

The effect of clinoptilolite alone or in combination with phytase on the performance, carcass characteristics, intestinal histomorphology, and tibia ash and Ca, P levels were determined in male broiler chickens. Total of 192 one-day-old male broiler chicks (Ross 308) were randomly assigned to 4 different treatments with 8 replicates containing 6 birds each. Treatment 1 (T1) was served as control fed a diet without clinoptilolite and/or phytase, Treatment 2 (T2) was supplemented with 2% clinoptilolite. Treatment 3 (T3) and Treatment 4 (T4) were (formulated Ca; 0.87, 0.80 and 0.75%, available P; 0.30, 0.28 and 0.26% for starter, grower, and finisher periods respectively) supplemented 0.01% phytase and 2% clinoptilolite + 0.01% phytase, respectively. The results showed that combined use of clinoptilolite and phytase (T4) in broiler diets decreased (P=0.044) body weight gain at 1-14 d. Dietary treatments had no effect on body weight gain, feed intake (FI) and feed conversion ratio (FCR) during the entire experimental period. Supplementation with phytase (T3) significantly (P=0.006) decreased crypt depth in duodenum on d 21. Tibia ash and phosphorus level were decreased due to combined use of clinoptilolite and phytase (T4) in comparison to those fed control (T1) and clinoptilolite (T2) diets on d 21. At 42 days of age, tibia ash, Ca, P levels and Ca/P ratio was not changed by the treatments. It is concluded that there might be a positive effect of 2% clinoptilolite on the performance of male broilers after starting period. Keywords