Injectable organic and inorganic selenium in dairy cows – Effects on milk, blood and somatic cell count levels

Onderstepoort Journal of Veterinary Research

Field Value
Title Injectable organic and inorganic selenium in dairy cows – Effects on milk, blood and somatic cell count levels
Creator Ferreira, Gert M. Petzer, Inge-Marie
Subject veterinary science dairy cows; injectable selenium; Na-selenite; Se-methionine; serum selenium; milk selenium, SCC; somatic cell count
Description Mastitis is the most costly disease of dairy cows. A pro-active approach includes insuring adequate levels of selective trace minerals. The aim of this study was to determine the effect of two different commercially available, injectable selenium products, (sodium) Na-selenite (inorganic) and (selenium) Se-methionine (organic), on milk composition and on serum and milk selenium concentrations in high-yielding Holstein cows on total mix ration. Sixty multiparous cows were randomly selected into three groups of 20, one control group and two groups supplemented with injectable trace minerals. Blood and milk samples were collected over a period of 60 days. No specific change was indicated in milk yield, lactose, milk urea nitrogen (MUN) and milk pH levels compared with baseline values. The Se-methionine supplemented group showed a numerical increase in total milk protein percentage. In the group injected with Se-methionine, a negative correlation was present for the initial 72 hours between serum selenium concentration and somatic cell count (SCC) and a highly significant (p 0.001) increase in milk selenium concentration for the initial 24 hours. Serum selenium concentration of Se-methionine-supplemented cows was however not significantly changed. Injection of Na-selenite led to a 60-day initial increase in serum selenium concentration above baseline levels and a significant milk selenium concentration on day 1 but to a negative correlation between serum selenium concentration and SCC. Differences in serum and milk selenium concentrations followed with the use of organic and inorganic selenium injectables. Injectable Na-selenite, as selenium, can be of important value for cattle farmers if supplemented on strategically physiological periods to improve production, reproduction and immunity.
Publisher AOSIS
Date 2019-10-08
Type info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion — Control study
Format text/html application/epub+zip text/xml application/pdf
Identifier 10.4102/ojvr.v86i1.1664
Source Onderstepoort Journal of Veterinary Research; Vol 86, No 1 (2019); 8 pages 2219-0635 0030-2465
Language eng
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Coverage — — dairy cows
Rights Copyright (c) 2019 Gert M. Ferreira, Inge-Marie Petzer