HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Jordan, R. M. Articles by Spurrell, F. A. Search for Related Content PubMed PubMed Citation Articles by Jordan, R. M. Articles by Spurrell, F. A.

Effect of Calcium and Phosphorus Levels on Growth, Reproduction and Bone Development of Ponies¹

University of Minnesota, St. Paul 55108

Abstract

Thirty 4-month-old Shetland foals were fed pelleted rations that provided either (1) a calcium-phosphorus ratio of 2:1 (.9% calcium and .45% phosphorus) or (2) a calcium-phosphorus ratio of approximately 6:1 (2.5% calcium and .45% phosphorus) for a 4-year period. At the wider ratio the calcium intake was four to five times greater than the requirements suggested by Schryver and Hintz. However, dietary treatment had no effect on height, average weight gain or reproduction.

Scalar selected radiograph projection areas and gamma ray absorption measurements suggest that treatment did affect bone growth. Subperiosteal appositional bone growth achievement was similar; however, the medullary region was relatively larger and the cortical bone area relatively smaller in ponies fed the high calcium diet. These differences in anatomical distribution of areas are accompanied by a decrease in the amount of bone mineral per unit of projection area of the cortex.

¹ Paper No. 8523, Scientific Journal Series, Minnesota Agricultural Experiment Station, St. Paul.