Adverse effects of wide calcium:phosphorus ratios on supplemental phytase efficacy for weanling pigs fed two dietary phosphorus levels.

Qian, Hongliang; Kornegay, E. T.; Conner, D. E.

doi:10.2527/1996.7461288x

Cited by 128 publications

(105 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Assessing the effects of high Ca:P (1.2:1, 1.6:1, and 2.0:1), with two levels of dietary phosphorus (0.360 and 0.435%), and phytase supplementation in piglets, Qian et al (1996) found that the ADG and feed efficiency decreased linearly as Ca:P ratio increased in the diets. The authors associated the lower performance to a possible negative effect of calcium excess on phosphorus absorption in the small intestine of pigs as a result of insoluble complexes formation, especially when the dietary phosphorus is below the required by the pigs.…”

Section: Resultsmentioning

confidence: 99%

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

Saraiva¹,

Donzele²,

Oliveira³

et al. 2011

R. Bras. Zootec.

View full text Add to dashboard Cite

-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.

show abstract

Section: Resultsmentioning

confidence: 99%

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

Saraiva¹,

Donzele²,

Oliveira³

et al. 2011

R. Bras. Zootec.

View full text Add to dashboard Cite

show abstract

“…The NRC (1988) reports that the optimal Ca:P ratio in pig diets is between 1:1 and 1.5:1 for grain-soyabean meal based diets. However, when phytase was added to pig diets Qian et al (1996) found that P digestibility was decreased when the Ca:tP ratio was increased from 1.2:1 to 1.6:1. Ideally, the Ca:P ratio should be based on available Ca and P instead on total Ca and P. However, many more studies are needed to generate a reliable data base for available Ca and P values from various grain sources.…”

Section: Discussionmentioning

confidence: 99%

“…The range of equivalency values for 500 U/kg phytase is larger ranging from 0.64 g P to 2.47 g P. Factors which may influence these equivalency value estimates include: the basal level of P, the age of the animal, the response criteria used, and perhaps most importantly the ratio of Ca to P. Qian et al (1996) reported a detrimental effect of a widening Ca:tP ratio in excess of 1.2:1 on phytase efficacy in pigs. In the pig studies of Jongbloed et al (1996a), Kornegay and Qian (1996) , and Yi et al (1996) only two levels of P were fed, so the response of various criteria to P was assumed to be linear.…”

Section: Discussionmentioning

confidence: 99%

Phosphorus equivalency value of microbial phytase in weanling pigs fed a maize-soyabean meal based diet

Radcliffe¹,

Kornegay²

1998

J. Anim. Feed Sci.

View full text Add to dashboard Cite

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.

show abstract

“…BW 5 body weight; Ca 5 calcium; P 5 phosphorus; tP 5 total P; PP 5 phytate P; NPP 5 non-phytate P; NPPp 5 non-phytate P from plant sources; NPPm-a 5 non-phytate P from mineral and animal sources; PhytP 5 plant phytase; PhytM 5 microbial phytase; ADG 5 average daily gain; ADFI 5 average daily feed intake. (1992, 1996 and 2000), Kemme et al (1997a, 1997b, 1999a and 1999b) (1984( , 1985( , 1987a( and 1987b( ), Qian et al (1996, Values and numbers from experimental groups related to diets containing plant and microbial phytase only; FTU, phytase unit.…”

Section: Data Collection and Codingmentioning

confidence: 99%

Meta-analysis of phosphorus utilization by growing pigs: effect of dietary phosphorus, calcium and exogenous phytase

Létourneau-Montminy

Jondreville

Sauvant

et al. 2012

animal

View full text Add to dashboard Cite

Optimizing phosphorus (P) utilization in pigs requires improving our capacity to predict the amount of P absorbed and retained, with the main modulating factors taken into account, as well as precisely determining the P requirements of the animals. Given the large amount of published data on P utilization in pigs, a meta-analysis was performed to quantify the impact of the different dietary P forms, calcium (Ca) and exogenous phytases on the digestive and metabolic utilization criteria for dietary P in growing pigs. Accordingly, the amount of phytate P (PP) leading to digestible P (g/kg) was estimated to be 21%, compared with 73% for non-phytate P (NPP) from plant ingredients and 80% for NPP from mineral and animal ingredients ( P , 0.001). The increase in total digestible dietary P following the addition of microbial phytase (PhytM) from Aspergillus niger ( P , 0.001) was curvilinear and about two times higher than the increase following the addition of plant phytase, which leads to a linear response ( P , 0.001). The response of digestible P to PhytM also depends on the amount of substrate, PP (PhytM 2 3 PP, P , 0.001). The digestibility of dietary P decreased with dietary Ca concentration ( P , 0.01) independently of phytase but increased with body weight (BW, P , 0.05). Although total digestible dietary P increased linearly with total NPP concentration ( P , 0.001), retained P (g/kg), average daily gain (ADG, g/day) and average daily feed intake (ADFI, g/day) increased curvilinearly ( P , 0.001). Interestingly, whereas dietary Ca negatively affected P digestibility, the effect of dietary Ca on retained P, ADG and ADFI depended on total dietary NPP (NPP 3 Ca, P , 0.01, P , 0.05 and P , 0.01, respectively). Increasing dietary Ca reduced retained P, ADG and ADFI at low NPP levels, but at higher NPP concentrations it had no effect on ADG and ADFI despite a positive effect on retained P. Although the curvilinear effect of PhytM on digestible P increased with PP ( P , 0.001), this effect was lessened by total NPP for ADG and ADFI (PhytM 3 NPP and PhytM 2 3 NPP, P , 0.05) and depended on both total NPP and Ca for retained P (PhytM 2 3 NPP 3 Ca, P , 0.01). This meta-analysis improves our understanding of P utilization, with major modulating factors taken into account. The information generated will be useful for the development of robust models to formulate environmentally friendly diets for growing pigs.Keywords: calcium, growing pigs, meta-analysis, phosphorus, phytase ImplicationsEnvironmental and economic concerns regarding phosphorus (P) in pig production demand a reduction in dietary P provision. This requires an improvement in our ability to predict the amount of calcium (Ca) and P absorbed and retained taking into account the main sources of variation. In this context, the present meta-analysis proposes a quantitative evaluation of the influence of dietary P sources, Ca concentration and phytase addition on pig response to dietary P. The relationship established in this work will represent a useful tool to f...

show abstract

Adverse effects of wide calcium:phosphorus ratios on supplemental phytase efficacy for weanling pigs fed two dietary phosphorus levels.

Cited by 128 publications

References 15 publications

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

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

Phosphorus equivalency value of microbial phytase in weanling pigs fed a maize-soyabean meal based diet

Meta-analysis of phosphorus utilization by growing pigs: effect of dietary phosphorus, calcium and exogenous phytase

Contact Info

Product

Resources

About