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RESEARCH ARTICLE

Managing plasma P concentrations in beef heifers with a slow release vitamin D supplementation

N. W. Tomkins A D , R. Elliott B , J. J. McGrath B and T. Schatz C
+ Author Affiliations
- Author Affiliations

A Meat & Livestock Australia, 45 King Street, Bowen Hills, Qld 4006, Australia.

B DSM Nutritional Products Australia Pty Ltd, Princeton Court 3, Suite 6, 13 Princeton Street, Kenmore, Qld 4069, Australia.

C Northern Territory Department of Resources, GPO Box 3000, Darwin, NT 0801, Australia.

D Corresponding author. Email: ntomkins@mla.com.au

Animal Production Science 60(5) 610-617 https://doi.org/10.1071/AN17601
Submitted: 11 October 2017  Accepted: 14 July 2019   Published: 22 January 2020

Abstract

Context: In extensive northern grazing systems, supplementation of P is recommended to maximise cattle growth rates and reproduction. Improving the absorption of P for the animal by influencing metabolic pathways has the potential to improve both the productivity and profitability of extensive livestock enterprises.

Aims: This study evaluated the efficacy of rumen bolus containing 25-hydroxyvitamin D (25OHD), commercially available as Hy-D®, and/or monensin on blood P and Ca concentrations in young cattle.

Methods: A total of 84 heifers, initial liveweight (mean ± s.e.m.) 184 ± 2.0 kg, were allocated to four groups, dosed with one of four slow release bolus: (1) placebo (control), (2) monensin (120 mg/day), (3) Hy-D® (6 mg/day), or (4) monensin with Hy-D®, and managed on a common unimproved native pasture from August 2012 to February 2013. On four occasions postdosing, liveweight, hip height and body condition scores were recorded, and individual faecal and jugular blood samples were collected.

Key results: Supplementation with monensin had a significant effect (P < 0.05) on average daily gains for the first 25 days. Interactions between 25OHD and monensin and time × monensin were also significant (P < 0.05). After 188 days, heifers receiving monensin or 25OHD + monensin were 5 and 10 kg heavier respectively, compared with their counterparts in the control and 25OHD groups. Plasma P concentrations at 25 days were 6.6 mg/dL, then increased to between 8.5 and 9.0 mg/dL and maintained this level for up to 109 days with a bolus releasing 6.0 mg/day 25OHD.

Conclusions: The study demonstrated that sustained and elevated plasma concentrations of both 25OHD and P, compared with control animals, can be achieved. The slow release rumen bolus maintained an elevated plasma concentration of 25OHD, and indicated that a target plasma concentration for 25OHD for increasing P absorption in beef cattle is between 200 and 300 ng/mL.

Implications: Supplementation of a metabolite of vitamin D influences P metabolism in Brahman heifers under grazing conditions. Integration with standard supplementation practices would optimise growth rates and reproductive performance.

Additional keywords: grazing, growth rate, northern pastures, phosphorus, supplements.


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