Performance of pigs fed diets with microbial phytase
1998
Ramos, S.H.M. | Oliveros, B.A. | Alcantara, P.F. (Philippines Univ. Los Banos, College, Laguna (Philippines). Inst. of Animal Science)
A feeding trial was conducted to evaluate the performance of pigs fed diets with microbial phytase. Thirty weanling pigs were randomly distributed to five dietary treatments with six replications per treatment. The five treatments were as follows: T1 (control)-basal diet containing 1.06, 0.79, and 0.59 percent MDCP [mono-dicalcium phosphate] in the starter, grower and finisher diets, respectively; T2-basal diet + microbial phytase (MP); T3-basal diet with 25 percent less MDCP + MP; T4-basal diet with 50 percent less MDCP + MP; and T5-basal diet with 75 percent less MDCP + MP. The microbial phytase was added at the rate of 200 grams per ton. Performance of pigs receiving 50 percent less MDCP with MP was comparable to those receiving 100 percent MDCP alone, in terms of the average daily gain (ADG). No additional increase in average daily feed consumption was obtained when microbial phytase was supplemented at 100 percent MDCP level. The addition of microbial phytase allowed the reduction of MDCP to 50 percent without affecting feed efficiency. The decreasing levels of MDCP and the addition of MP in the diet failed to increase bone calcium content and bone hardness. However, bone phosphorus content decreased (P less than 0.05) with decreasing amount of MDCP supplementation. Phosphorus excretion decreased (P less than 0.05) with decreasing MDCP supplementation in the diets at 50 percent less MDCP addition in the diet, a savings of P1.05 per kg gain in weight of pigs could be obtained compared to pigs receiving 100 percent MDCP alone
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