Bone ash

Effects of dietary digestible calcium on growth performance and bone ash concentration in 50- to 85-kg growing pigs fed diets with different concentrations of digestible phosphorus

Lagos L. V., C. L. Walk, M. R. Murphy, H. H. Stein. 2019. Effects of dietary digestible calcium on growth performance and bone ash concentration in 50- to 85-kg growing pigs fed diets with different concentrations of digestible phosphorus. Anim. Feed Sci. Technol. 247: 262 - 272. Link to full text.

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Influence of the concentration of dietary digestible calcium on growth performance, bone ash, and abundance of genes involved in intestinal absorption of calcium in pigs from 11 to 25 kg fed diets with different concentrations of digestible phosphorus

Requirements for P for growing pigs are expressed as the requirement for standardized total tract digestible (STTD) P, whereas requirements for Ca are usually expressed as requirements for total Ca. It is, however, recognized that diets for pigs are most accurately formulated based on a STTD Ca:STTD P ratio, and recent work has generated values for STTD of Ca in most Ca containing feed ingredients, which makes it possible to formulate diets based on STTD Ca.

Recent data from the University of Illinois have indicated that if STTD P is at the requirement, a ratio between STTD Ca and STTD P that is less than 1.35:1, 1.25:1, and 1.10:1 maximizes growth performance of pigs from 25 to 50 kg, 50 to 85 kg, and 100 to 130 kg, respectively. However, the STTD Ca:STTD P ratio needed to maximize bone ash is greater than the ratio needed to maximize growth performance. An attempt to estimate the requirement for STTD Ca by pigs from 11 to 25 kg was also made, but due to a reduction in ADG and G:F as dietary Ca increased, an optimal STTD Ca:STTD P ratio could not be estimated.

Calcium may be absorbed by transcellular or paracellular transport. Transcellular transport is the primary route if dietary Ca is low, but if dietary Ca is adequate or high, Ca is mainly absorbed using the paracellular route via the tight junctions. However, there are limited data demonstrating effects of dietary Ca concentration on abundance of genes related to transcellular and paracellular transport of Ca in the small intestine of pigs.

Therefore, the objectives of this experiment were to test the hypotheses that a STTD Ca:STTD P ratio less than 1.40:1 maximizes growth performance of pigs from 11 to 25 kg and that increasing dietary Ca downregulates abundance of genes related to transcellular absorption of Ca and tight junction proteins in the small intestine.

 

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Effects of a novel phytase on growth performance, bone measurements, and Ca and P digestibility in diets fed to growing pigs

Blavi, L., J. N. Broomhead, and H. H. Stein. 2018. Effects of a novel phytase on growth performance, bone measurements, and Ca and P digestibility in diets fed to growing pigs. J. Anim. Sci. 96(Suppl. 2):163 (Abstr.) Link to abstract (.pdf)

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Comparison between a novel phytase and a commercial phytase on growth performance and bone measurements in diets fed to growing pigs

Munoz Alfonso, C. J., L. Blavi, J. N. Broomhead, and H. H. Stein. 2018. Comparison between a novel phytase and a commercial phytase on growth performance and bone measurements in diets fed to growing pigs. J. Anim. Sci. 96(Suppl. 2):147-148 (Abstr.) Link to abstract (.pdf)

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Requirement for digestible calcium at different dietary concentrations of digestible phosphorus indicated by growth performance and bone ash of 50 to 85 kg pigs

Lagos, L. V., C. L. Walk, and H. H. Stein. 2018. Requirement for digestible calcium at different dietary concentrations of digestible phosphorus indicated by growth performance and bone ash of 50 to 85 kg pigs. J. Anim. Sci. 96(Suppl. 2):130-131 (Abstr.) Link to abstract (.pdf)

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Effects of GraINzyme and AxtraPhy phytases in restoring performance and bone ash in pigs fed low-phosphorus and calcium diets

Last month's newsletter included a research report on research into a novel E. coli phytase expressed in corn, called GraINzyme. Results of that research indicated that adding GraINzyme phytase to diets fed to young growing pigs increased growth performance, digestibility of calcium and phosphorus, and bone mineralization. The comparative effects of GraINzyme and a commercial phytase was not tested in the previous study. Therefore, an experiment was conducted to compare effects of addition of GraINzyme phytase to the commercial phytase AxtraPhy in diets fed to growing pigs.

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Effects of graded levels of an Escherichia coli phytase on growth performance, apparent total tract digestibility of phosphorus, and on bone parameters of weanling pigs fed phosphorus-deficient corn-soybean meal based diets

She, Y., Y. Liu, J. C. González-Vega, and H. H. Stein. 2017. Effects of graded levels of an Escherichia coli phytase on growth performance, apparent total tract digestibility of phosphorus, and on bone parameters of weanling pigs fed phosphorus-deficient corn-soybean meal based diets. Anim. Feed Sci. Technol. 232:102-109. Link to abstract

Requirement for digestible calcium by eleven- to twenty-five–kg pigs as determined by growth performance, bone ash concentration, calcium and phosphorus balances, and expression of genes involved in transport of calcium in intestinal and kidney cells

González-Vega, J. C., Y. Liu, J. C. McCann, C. L. Walk, J. J. Loor, and H. H. Stein. 2016. Requirement for digestible calcium by eleven- to twenty-five–kilogram pigs as determined by growth performance, bone ash concentration, calcium and phosphorus balances, and expression of genes involved in transport of calcium in intestinal and kidney cells. J. Anim. Sci. 94:3321-3334. Link to full text (.pdf)

Effects of a novel phytase on growth performance and metacarpal bone ash in weanling pigs

Liu, Y., J. C. González-Vega, M. Vázquez-Añón, J. Zhao, J. Escobar, F. N. Almeida, and H. H. Stein. 2016. Effects of a novel phytase on growth performance and metacarpal bone ash in weanling pigs. J. Anim. Sci. 94(Suppl. 2):111-112 (Abstr.) Link to abstract (.pdf)

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Requirement for digestible calcium by 25 to 50 kg pigs at different dietary concentration of phosphorus by growth performance and bone ash concentration

An excess of calcium in swine diets may increase excretion of phosphorus due to formation of Ca-P complexes. Therefore, when formulating diets for pigs, it is important to consider the ratio of calcium to phosphorus. The proper ratio should ensure that both minerals are maximally utilized in the bodies of the pigs.

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Growth performance and bone mineralization in weanling pigs fed diets containing different levels of digestible calcium and digestible phosphorus

It is important to include calcium and phosphorus in the diets in the proper proportions because the excess or deficiency of one mineral may affect the utilization of the other. Calcium requirements in the 2012 NRC are based on a model, which used a 2.15 ratio of total calcium to standardized total tract digestible (STTD) phosphorus. An optimal ratio of STTD calcium to STTD phosphorus has not been reported because not enough data exist on the standardized total tract digestibility of calcium. However, recent studies conducted by the Stein Monogastric Nutrition Lab have determined values for STTD calcium for several calcium sources. With these data, it is possible to determine the requirement for STTD calcium. Therefore, an experiment was conducted to determine the requirement of STTD calcium to maximize growth performance and bone ash in 11 to 25 kg pigs.

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Effects of superdosing of microbial phytase in diets for weanling pigs

Crenshaw, T. D., O. Adeola, M. J. Azain, S. K. Baidoo, S. D. Carter, G. M. Hill, S. W. Kim, P. S. Miller, M. C. Shannon, and H. H. Stein. 2015. Effects of superdosing of microbial phytase in diets for weanling pigs. J. Anim. Sci. 93(Suppl. s3):227 (Abstr.) Link to abstract (.pdf)

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Effect of a 6-phytase derived from Buttiauxella spp. expressed in Trichoderma reesei on apparent total tract digestibility of Ca and P, bone ash, and growth performance in weaning piglets

Wealleans, A. L., Y. Dersjant-Li, R. M. Bold, and H. H. Stein. 2014. Effect of a 6-phytase derived from Buttiauxella spp. expressed in Trichoderma reesei on apparent total tract digestibility of Ca and P, bone ash, and growth performance in weaning piglets. J. Anim. Sci 92(E-Suppl. 2):237 (Abstr.) Link to abstract (.pdf)

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Effects of high-protein canola meals fed to weanling pigs on growth performance, organ weights, bone ash, and blood parameters

Parr, C. K., Y. Liu, C. M. Parsons, and H. H. Stein. 2014. Effects of high-protein canola meals fed to weanling pigs on growth performance, organ weights, bone ash, and blood parameters. J. Anim. Sci. 92(Suppl. 2):61-62 (Abstr.) Link to abstract (.pdf)

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Effects of including microbial phytase in diets fed to pigs and broilers

Lowell, J. E., M. Song, J. K. Mathai, and H. H. Stein. 2013. Effects of including microbial phytase in diets fed to pigs and broilers. J. Anim. Sci. 91(Suppl. 2):121 (Abstr.) Link to abstract (.pdf)

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Relative bioavailability of phosphorus in inorganic phosphorus sources fed to growing pigs

Petersen, G. I., C. Pedersen, M. D. Lindemann and H. H. Stein. 2011. Relative bioavailability of phosphorus in inorganic phosphorus sources fed to growing pigs. J. Anim. Sci. 89:460-466. Link to full text (.pdf)