А. Ilchev, G. Gаnchev, S. Chobanova, D. Kanakov, P. Petkov, I. Nikiforov Five balance feeding trials were performed to evaluate age-related changes in nitrogen, phosphorus and calcium utilization in growing and fattening male castrated DanBred hybrid pigs. Two commercial phytase prepa

Three balance feeding trials were performed with 3 groups male castrated pigs during the starter, grower and finisher periods. The animals were housed in specially designs individual cages that allowed for separate collection of urine and faeces. Each trial comprised 5 days preliminar