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Effect of Ca: P ratio on grower-finisher pig performance and mineral excretion

Published online by Cambridge University Press:  20 November 2017

S.M. Brady ,
J.J. Callan ,
D. Cowan ,
M. McGrane  and
J.V. O’Doherty
S.M. Brady
Affiliation:
University College Dublin, Lyons Research Farm, Newcastle, Co Dublin, Ireland
J.J. Callan
Affiliation:
University College Dublin, Lyons Research Farm, Newcastle, Co Dublin, Ireland
D. Cowan
Affiliation:
Novo Nordisk S.A., 282 Chartridge Lane, Chesham, Bucks, UK
M. McGrane
Affiliation:
Trouw Nutrition, 206 Ryevale Lawns, Leixlip, Co. Kildare, Ireland
J.V. O’Doherty
Affiliation:
University College Dublin, Lyons Research Farm, Newcastle, Co Dublin, Ireland
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Extract

The level of calcium (Ca) in the diet affects the utilisation of phytic acid-phosphorus (P) through the formation of insoluble Ca phytate and/or reduction of phytase activity (Larsen 1993). High Ca: total P ratios (Ca: tP) (1.5:1 to 2.0:1) in corn-soya bean meal diets supplemented with microbial phytase decreased the utilisation of P for weanling (Lei et al., 1994) and growing-finishing (Liu et al., 1998) pigs. However, it is important to note that the majority of research using supplemental microbial phytase and Ca:P ratios was carried out using maize-soyabean meal based diets. The objective of this experiment is to examine the effect of Ca: tP ratio on the efficacy of microbial phytase and its effects on pig performance, nutrient digestion and mineral metabolism using wheat, barley and soya bean meal based diets.

Type
Poster Presentations
Information
Proceedings of the British Society of Animal Science , Volume 2001 , 2001 , pp. 142
Copyright
Copyright © The British Society of Animal Science 2001

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References

Larsen, T. and Sandström, B. 1993. Effect of dietary calcium level on mineral and trace element utilisation from rapeseed (Brassica napus L.) diet fed to ileum-fistulated pigs. British Journal of Nutrition 69: 221–224.CrossRefGoogle ScholarPubMed
Lei, X.G., Ku, P.K., Miller, E.R. and Yokoyuma, M.T., Ullrey, D.E. 1994. Calcium level affects the efficacy of supplemental microbial phytase in corn-soya bean meal diets of weanling pigs. Journal of Animal Science 72: 139–143.CrossRefGoogle Scholar
Liu, J., Bollinger, D.W., Ledoux, D.R., Veum, T.L. 1998. Lowering the dietary calcium to total phosphorus ratio increases phosphorus utilisation in low-phosphorus corn-soya bean meal diets supplemented with microbial phytase for growing-finishing pigs. Journal of Animal Science 76:808–813.Google Scholar