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Differences in peripartal plasma parameters related to calcium homeostasis of dairy sheep and goats in comparison with cows

Published online by Cambridge University Press:  28 May 2014

Mirja R Wilkens*
Affiliation:
Department of Physiology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
Annette Liesegang
Affiliation:
Institute of Animal Nutrition, Vetsuisse Faculty Zurich, University of Zurich, Zurich, Switzerland Center for Applied Biotechnology and Molecular Medicine, University of Zurich, Zurich, Switzerland
Julia Richter
Affiliation:
Department of Physiology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
David R Fraser
Affiliation:
Faculty of Veterinary Science, University of Sydney, Sydney, Australia
Gerhard Breves
Affiliation:
Department of Physiology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
Bernd Schröder
Affiliation:
Department of Physiology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
*
*For correspondence; e-mail: [email protected]

Abstract

Recently it has been demonstrated that there are differences between sheep and goats in respect to adaptation to a calcium-restricted diet. It was the aim of the present study to evaluate whether species-specific peculiarities also occur when calcium homoeostasis is challenged by lactation. Therefore, we investigated the time courses of plasma parameters related to calcium homoeostasis (calcium, phosphate, calcitriol, the bone resorption marker CrossLaps® and the bone formation marker osteocalcin) during the transition period in multiparous animals of both species and compared the results to data from a former study carried out with dairy cows. As in cows, plasma calcium and the ratio of bone formation to bone resorption decreased at parturition in goats while plasma calcitriol increased. On day 10 post partum the bone parameters of goats reached prepartum values again, which was not the case in cows. Sheep were found to experience a challenge of calcium homoeostasis already 10 d before parturition, reflected by a very low ratio of bone formation to bone resorption, which was not accompanied by an increase in plasma calcitriol. Additionally, sheep and goats which had been in milk for 3 months were sampled, dried-off and sampled again 6 weeks later. In dried-off animals there were no detectable differences in parameters of bone metabolism. In conclusion we could show that the contribution of bone mobilisation to the compensation for the enhanced calcium demand due to lactation differs between the three ruminant species.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 2014 

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