Please use this identifier to cite or link to this item:
|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) ; Elliot, R (author)||Publication Date:||2012||DOI:||10.1071/AN11293||Handle Link:||https://hdl.handle.net/1959.11/10842||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/head.day, 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||Statistics to Oct 2018:||Visitors: 172|
|Appears in Collections:||Journal Article|
Files in This Item:
checked on Oct 18, 2021
checked on Mar 1, 2019
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.