Mineral and citrate concentrations in milk are affected by seasons, stage of lactation and management practices

Dunshea, Frank R., Walker, Glen P., Williams, Roderick, and Doyle, Peter T. (2019) Mineral and citrate concentrations in milk are affected by seasons, stage of lactation and management practices. Agriculture, 9 (2). 25.

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Abstract

This study was conducted to examine associations between nutrition, time of year and season of calving on milk mineral concentrations in 24 pasture-based dairy farms. There was substantial variation in the concentrations (mean with range in parentheses) of Ca 1072 (864-1310) mg/kg; citrate 1579 (880-2080) mg/kg; P 885 (640-1040) mg/kg; Mg 98 (73-122) mg/kg; Na 347 (248-554) mg/kg; K 1534 (1250-2010) mg/kg; and S 295 (155-372) mg/kg with most of the variation associated with stage of lactation, although the influence of days in milk was different for different minerals. Feeding practices were also important in determining the concentrations of some components. Milk Ca, citrate, P, and K concentrations were greater (p < 0.05) in cows receiving mineral supplements, while Ca, P and Mg were positively correlated (p < 0.05) with the amount of concentrates fed. Milk citrate and K concentrations were positively correlated (p < 0.05) with herbage allowance. Milk Se (15 (<3-37) mu g/kg) and Zn (3.4 (2.2-4.9) mg/kg) also varied with time of year, with Se concentrations also greater (13.7 vs 11.6 mu g/kg) in spring compared with autumn calving herds and positively correlated (p < 0.05) with the amount of concentrates fed and mineral supplementation. These data indicate that calving pattern and feeding practices could be used to reduce variation in the measured milk mineral concentrations.

Item ID: 57535
Item Type: Article (Research - C1)
ISSN: 2077-0472
Keywords: lactation, milk quality, calcium, selenium, minerals
Copyright Information: © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Funders: Department of Economic Development, Jobs, Transport and Resources, Dairy Australia
Date Deposited: 20 Mar 2019 07:35
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 50%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070203 Animal Management @ 50%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830302 Dairy Cattle @ 100%
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