Phosphorus equivalency value of microbial phytase in weanling pigs fed a maize-soyabean meal based diet
More details
Hide details
Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0306, USA
Publication date: 1998-03-25
J. Anim. Feed Sci. 1998;7(2):197–211
Ninety-six crossbred pigs with an average initial weight of 10.3 kg were used in a 4-wk experiment to investigate the P equivalency value of microbial phytase in weanling pigs using performance, rib mineralization and faecal digestibility measurements. A 19% CP, maize-soyabean meal basal diet low in P (0.35%) and Ca (0.50%) was fed. Diets 1, 2, 3, and 4 contained 0, 167, 333, and 500 units (U) of added Natuphos® phytase per kg of diet, respectively. Diets 5, 6, and 7 contained no added phytase, and 0.40, 0.45, and 0.50% P, respectively. Body weight and pen feed consumption were measured weekly. During wk 4, pen faecal samples were collected twice daily for 5 d for determination of P, Ca and DM digestibilities. At the end of wk 4, the barrow from each pen (n = 48) was killed for collection of tenth ribs for determination of rib shear force, and ash content. Adding phytase to low P diets linearly increased (P < 0.02 to 0.001) ADG, rib shear force, rib ash weight and ash percent. Added P linearly increased (P < 0.02 to 0.001) ADG, rib shear force, rib ash weight, and ash percent, Ca and P digestibility and digestible Ca and P. Based on phytase and P linear or nonlinear response equations for ADG, P digestibility, rib ash weight and rib shear force, 500 U/kg of microbial phytase was equivalent to 1.03, 0.78, 0.89, and 0.69 g of inorganic P, respectively. The average equivalency of 500 U/kg of phytase was 0.84 g of P per kg of diet.
Meta-analysis of phosphorus utilization by growing pigs: effect of dietary phosphorus, calcium and exogenous phytase
M. P. Létourneau-Montminy, C. Jondreville, D. Sauvant, A. Narcy
Estimating equivalency values of microbial phytase for amino acids in growing and finishing pigs fitted with steered ileo-cecal valve cannulas
J. S. Radcliffe, R. S. Pleasant, E. T. Kornegay
Journal of Animal Science
Animal management to reduce phosphorus losses to the environment1
K. F. Knowlton, J. S. Radcliffe, C. L. Novak, D. A. Emmerson
Journal of Animal Science
A critical review of methods used to determine phosphorus and digestible amino acid matrices when using phytase in poultry and pig diets
Yueming Dersjant-Li, Milan Hruby, Ceinwen Evans, Ralf Greiner
Journal of Applied Animal Nutrition
Phytase, a New Life for an “Old” Enzyme
Xin Lei, Jeremy Weaver, Edward Mullaney, Abul Ullah, Michael Azain
Annual Review of Animal Biosciences
Phosphorus Equivalency of Phytase with Various Evaluation Indicators of Meat Duck
Yan Wu, Shujing Xu, Xinhui Wang, Hongyang Xu, Peiyao Liu, Xiaoguang Xing, Zhili Qi
Poultry Science
Evaluation of a novel hybrid 6-phytase using an updated phosphorus deficiency model in broiler chickens
Tingting Wang, Joshua Jendza, Peter Ader, Olayiwola Adeola, Filippo Miglior
Canadian Journal of Animal Science