Establishing a digestible calcium requirement for pigs

H. H. Stein, L. A. Merriman, J. C. González-Vega

Research output: Chapter in Book/Report/Conference proceedingChapter


The standardized total tract digestibility (STTD) of calcium (Ca) in most feed ingredients used in diets fed to pigs has been determined, and the effect of microbial phytase on STTD of Ca has also been determined. This has made it possible to formulate diets based on values for STTD of Ca and attempts to determine requirements for STTD of Ca for 11 to 25, 25 to 50, and 100 to 130 kg pigs have been made. Results of these experiments have indicated that STTD Ca provided in excess of the requirement is detrimental to pig growth performance. This is particularly true if dietary STTD phosphorus (P) is marginal, whereas the negative effects of excess Ca is mitigated if STTD P is provided in excess of the requirement. As a consequence, effects of microbial phytase on the STTD of Ca need to be accounted for in diet formulation. Based on currently available information, it is recommended that diets for pigs less than 50 kg are formulated to have a STTD Ca:STTD P ratio between 1:1 and 1.35:1, whereas diets for pigs greater than 100 kg should have a STTD Ca:STTD P ratio that does not exceed 1.1:1.

Original languageEnglish (US)
Title of host publicationPhytate Destruction - Consequences for Precision Animal Nutrition
PublisherWageningen Academic Publishers
Number of pages10
ISBN (Electronic)9789086868360
ISBN (Print)9789086862900
StatePublished - Jan 1 2016


  • Digestibility
  • Minerals
  • Phosphorus
  • Pigs

ASJC Scopus subject areas

  • General Engineering
  • General Agricultural and Biological Sciences


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