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Faecal calcium excretion does not decrease during long-term feeding of a low-calcium diet in adult dogs.

S Schmitt1, J Mack1, E Kienzle1

  • 1Chair of Animal Nutrition and Dietetics, Ludwig-Maximilians-University Munich, Oberschleissheim, Germany.

Journal of Animal Physiology and Animal Nutrition
|November 15, 2017
PubMed
Summary
This summary is machine-generated.

Adult dogs on low-calcium diets experience a negative calcium balance due to poor intestinal absorption. This indicates a lack of adaptation, consistent with clinical observations in dogs fed insufficient calcium.

Keywords:
calciumcalcium absorptioncalcium requirementsdog

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Area of Science:

  • Veterinary Nutrition
  • Canine Metabolism
  • Mineral Balance

Background:

  • Previous research suggests adult dogs do not adapt intestinal calcium absorption to decreased intake.
  • This can lead to negative calcium balance even with moderate dietary calcium reduction.

Purpose of the Study:

  • To determine if a negative calcium balance occurs at minimal canine calcium requirements (NRC, 2006).
  • To assess if this negative balance persists for up to six months on a low-calcium diet.

Main Methods:

  • Twelve adult dogs were fed a low-calcium diet (60 mg/kg body weight^0.75) for 28 weeks.
  • Digestion trials and blood analyses (calcium, phosphorus, PTH, vitamin D, bone turnover markers) were conducted periodically.
  • Apparent calcium digestibility and serum markers of bone metabolism were evaluated.

Main Results:

  • Apparent calcium digestibility was consistently negative, indicating a negative calcium balance.
  • Serum calcium, ionized calcium, and phosphorus remained within normal ranges.
  • Serum crosslaps increased significantly, suggesting ongoing bone resorption to mobilize calcium.

Conclusions:

  • Adult dogs do not adapt their intestinal calcium absorption to low-calcium diets, even at minimal recommended levels.
  • A sustained negative calcium balance occurs, leading to bone calcium mobilization.
  • Findings align with clinical observations in dogs fed low-calcium diets.