Biological availability of phosphorus in defluorinated phosphates with different phosphorus solubilities in neutral ammonium citrate for chicks and pigs

Abstract

Two experiments were conducted to assess the bioavailability of P in five sources of defluorinated phosphate (DFP) that differed in P solubility in neutral ammonium citrate (NAC). In Exp. 1, 384 2-d-old male chicks were fed a corn-cornstarch-dextrose-soybean meal basal diet (1.22% lysine, 1.00% Ca, .45% P) or the basal with .05 or .10% P from monosodium phosphate (MSP), or .10% P from DFP with 60, 70, 75, 82, or 91% NAC soluble P. Each diet was fed to six pen replicates of eight chicks per pen for 14 d (58 to 402 g). Growth rate, feed/gain, and tibia breaking strength and ash concentration were improved (P < .001) by P supplementation, regardless of P source. Tibia strength and ash were regressed on P intake, and slope-ratios were calculated to assess the relative bioavailability of P in the DFP sources. The bioavailabilities of P in the 60, 70, 75, 82, and 91% NAC soluble DFP sources, relative to MSP (given a value of 100), were 81, 75, 84, 84, and 91%, respectively (linear, P < .08). In Exp. 2, 35 individually penned pigs were fed a corn-soybean meal basal diet (.95% lysine, .75% Ca, .33% P) or the basal with .15% P from MSP or from the five DFP sources. Each diet was fed to five pigs for 33 d (15.0 to 35.9 kg). Growth rate, feed/gain, and breaking strength of the metacarpals, metatarsals, and femurs were improved (P < .001) by MSP and DFP.(ABSTRACT TRUNCATED AT 250 WORDS)

Effects of different phosphorus sources in the diet on bone composition and stability (breaking strength) in broilers

“…5/5* 2.10 a ± 0.25 1.62 b ± 0.37 1.53 b ± 0.20 1.14 c ± 0.21 Day 36 15/15* 1.77 a ± 0.20 1.77 a ± 0.24 1.73 a ± 0.28 1.34 b ± 0.33 *p < 0.05. n, number of broilers (trial 1/trial 2). The results demonstrated a significantly lower breaking strength of tibia and humerus and reduced ash contents in bones of broilers in group DFP (given 2.25 g digestible phosphorus per kg diet) corresponding to data measured by Coffey et al (1994). Other authors also described lower breaking strength and lower bone ash contents in broilers (Leske and Coon, 2002) or turkeys (Rodehutscord et al, 2003) fed diets with insufficient amounts of available phosphorus.…”

“…The results demonstrated a significantly lower breaking strength of tibia and humerus and reduced ash contents in bones of broilers in group DFP (given 2.25 g digestible phosphorus per kg diet) corresponding to data measured by Coffey et al. (1994).…”

Standardized total tract digestibility of phosphorus in various inorganic phosphates fed to growing pigs

“…Previous studies on the relative bioavailability of P in feed phosphates have shown that the P in DFP is less available than that in MCP or MSP (Cromwell ; Coffey et al . ). According to a review by Jondreville and Dourmad (), TCP and DFP have the lowest values of ATTD of P (55 and 60%) compared to DCP, MDCP and MCP which are slightly less than the values obtained in the present work.…”

Phosphorus availability in feed phosphates determined by regression

“…The need for supplementation depends on the composition of the diet, and in particular, on the dietary content of digestible P. Formerly, several phosphate sources have been used for supplementation without paying much regard to the digestibility of P. More recently, several studies have focussed on the determinations of P digestibility of different commercial feed phosphates (e.g. Walz and Pallauf, 1993;Coffey et al, 1994;Eeckhout and De Pape, 1997). However, the obtained results show large variation in the apparent digestibility of P in the tested sources (Eeckhout and De Pape, 1997).…”