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Levels of substitution of phosphate dicalcium by monodicalcium in the diets of swine in the growing and finishing phases

Fifty-six pigs (average initial weight of 28.47 kg) were assigned to a randomized blocks design, in a factorial scheme 4 x 2 (levels of dicalcium phosphate substitution x sex) with four repplicates for males and three for females, with two animals per experimental unit, to evaluate the effects of replacement levels of phosphate dicalcium by phosphate monodicalcium on the performance, blood and bone parameters of swine fed during the growing (30 to 60 kg) and finishing (60 to 90 kg) phases. Corn and soybean meal based -diets with phosphorus supplemented with replacement levels of 33.33, 66.67 and 100% of phosphate dicalcium (FBC) by monodicalcium (MBC) were formulated based on the values of total phosphorus, i.e., isophosphoric (0.56 and 0.42% in the growth and finishing phases, respectively). The levels of substitution of FBC for MBC did not influence the performance, absolute and relative weight of the kidneys and liver, carcass yield and blood parameters. However, a linear decrease was observed in the ash, phosphorus and calcium contents of the bones and a lineal increase in the thickness of the compact layer and in the layer compact/periosteal relationship of the bones with the substitution of FBC by MBC. It was conclude that during the growth and finishing phases the total and/or partial substitution of phosphate dicalcium by monodicalcium does not influence the performance of the animals.

fluorine; histology bone; nutrition; breaking strength; blood serum

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