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Title: Phosphorus and calcium retention in steers fed a roughage diet is influenced by dietary 25OH-vitamin D
Contributor(s): McGrath, Joseph  (author); Savage, Darryl  (author); Nolan, John V  (author)orcid ; Elliot, R (author)
Publication Date: 2012
DOI: 10.1071/AN11293
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Abstract: Active absorption of phosphorus (P) from the alimentary tract is promoted by increased concentrations of active vitamin D [1,25(OH)₂D₃] in blood; however, the production of this active vitamin is determined by plasma concentrations of calcium (Ca) and not P. As a consequence, diets of adequate Ca content, but insufficient P, will not promote active P absorption. Dietary supplements of 25OH-vitamin D (25OHD), the precursor of 1,25(OH)₂D₃, may stimulate P absorption and P retention of ruminants consuming diets marginally deficient in P. To evaluate this hypothesis, steers (n = 18) were fed a pelleted low-quality roughage diet containing an adequate Ca concentration (0.68%). Nine steers received a supplement of 25OHD mixed into their feed, at a rate of 3.25 mg/, before pelleting. The other nine steers were fed the Control diet without supplementation. All steers were individually housed for 10 days before being moved into metabolism crates for a further 3-day period. The steers which received the diet containing 25OHD exhibited increased retention of P and Ca, ~4 and 3 g/day, respectively. Blood samples were taken before the adaptation period and then daily during the period in the metabolism crates. Plasma concentrations of both P and Ca were increased by 25OHD supplementation throughout the collection period. Addition of 25OHD to the diet of grazing animals may reduce the need for P supplementation programs and improve productivity.
Publication Type: Journal Article
Source of Publication: Animal Production Science, 52(6 & 7), p. 636-640
Publisher: CSIRO Publishing
Place of Publication: Melbourne, Australia
ISSN: 1836-0939
Field of Research (FoR) 2008: 070204 Animal Nutrition
Field of Research (FoR) 2020: 300303 Animal nutrition
Socio-Economic Objective (SEO) 2008: 830503 Live Animals
Socio-Economic Objective (SEO) 2020: 100699 Primary products from animals not elsewhere classified
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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