Response to Phytase Addition on Production Variables, and Excretion of Phosphorus in Faeces of Finishing Lambs

Phosphorus exists in grains mostly as phytate (myo-inositol 1,2,3,4,5,6-hexakis dihydrogen phosphate) which required sufficient digestive phytase enzyme to break the molecule and release P. The aim of the study was to evaluate the effect of phytase on some production variables of lambs fed with finishing diet with high sorghum content (70%). Thirty two Dorper × Pelibuey lambs (27.45 ± 2.46 kg BW) were completely randomly distributed in four treatments with 8 repetitions, housed in individual cages and fed ad libitum for 60 d were used. The treatments were 0, 150, 300 and 450 g phytase enzyme/ton of sorghum grain-based diet. The daily gain was increased (P 0.05) by treatments. However, greater faecal phosphorus was noted with lambs fed on diet without phytase addition. The inclusion of phytase increased weight gain and reduced the faecal excretion of P. The dose of 150 g phytase/ton had the best daily gain; however, the dose 300 g phytase/ton had the lowest P excretion in manure. [G. Buendia Rodriguez, M. D. Montoya Flores, A. F. Sayed, N. I. Ortega Alvarez. Response to Phytase Addition on Production Variables, and Excretion of Phosphorus in Faeces of Finishing Lambs. Life Sci J 2015;12(2s):33-36]. (ISSN:1097-8135). http://www.lifesciencesite.com. 5