Available phosphorus levels in diets for 30 to 60 kg female pigs selected for meat deposition by maintaining calcium and available phosphorus ratio

Abstract

-With the objective to evaluate levels of available phosphorus (aP) in diets for pigs selected for meat deposition by maintaining the calcium and available phosphorus ratio, it was used 50 commercial hybrid female pigs with initial weight of 30.32 ± 0.29 kg, distributed in a complete randomized experimental design, with five treatments, five replicates, and two animals per experimental unit. Treatments were composed of a corn-soybean meal basal diet and four diets obtained by supplementation of basal diet with dicalcium phosphate, resulting in diets with 0.144; 0.224; 0.304; 0.384 and 0.464% of aP.Calcium levels were adjusted by varying the quantities of limestone in the diets. There was no effect of aP on both daily feed intake and feed conversion. Levels of aP affected daily weight gain which increased quadratically up to the estimated level of 0.372%. There was no effect of aP on quantity of phosphorus in the bones. The quantity of calcium in the bones and percentage of ash in the bones were influenced in an increasing linear way by the aP in the rations. The best result of weight gain of swine females, from 30 to 60 kg, genetically selected for meat deposition, is provided by the level of available phosphorus of 0.372%, which corresponds to a relationship with calcium of 2.06:1 and to a daily intake of 8.20 g of available phosphorus.

Phosphorus on performance, hematological, biochemical, and bone parameters of growing pigs

“…A quadratic effect (P<0.01) of available phosphorus levels on the daily weight gain (DWG) of animals was observed ( SARAIVA et al (2011) with pigs (30-60kg) are taken as reference, requirements of available phosphorus for gain weight are respectively 11.0 and 21.2% higher than those reported in the present study. These differences between studies may be related to differences between genetic potential, physiological state, age, and growth rate (EKPE et al, 2002).…”

Physiological and Transcriptional Responses in Weaned Piglets Fed Diets with Varying Phosphorus and Calcium Levels

“…There seems to be an optimum range of P content that should not be undercut or exceeded to reach a maximum DFI [ 27 ]. Yet, there is also no observed connection between P content and DFI [ 33 , 34 ]. It is conceivable that the DFI in H-group animals is lowered due to a decrease in the palatability of their diet [ 35 ].…”

Toward improved phosphorus efficiency in monogastrics—interplay of serum, minerals, bone, and immune system after divergent dietary phosphorus supply in swine

“…Pigs represent valuable experimental models to study the molecular routes influenced by variable supply of minerals and micronutrients ( 54 ). Many studies focused on optimized dietary P intake ( 26 , 53 , 63 ), but only a few studies have been published regarding molecular features involved in pathways being responsive for restricted or excessive dietary P levels ( 12 , 31 – 33 ). In pigs, P-restricted diets were associated with increased renal mRNA abundances of parathyroid hormone receptor and 1α-hydroxylase, corresponding to decreased PTH and increased circulating calcitriol levels ( 2 ).…”