Producing milk with uniform high selenium concentrations on commercial dairy farms

Doyle, P.T., Stockdale, C.R., Jenkin, M.L., Walker, G.P., Dunshea, F.R., Shields, P.M., and McKenna, A. (2011) Producing milk with uniform high selenium concentrations on commercial dairy farms. Animal Production Science, 51 (2). pp. 87-94.

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Abstract

Six herds on five commercial dairy farms were involved in the production of high selenium (Se) milk. The farms had a range of herd sizes, herd structures, feeding systems and milk production per cow. On all farms, pelleted concentrate supplements containing Se yeast were fed twice daily in the dairy for 16 days. The objectives were to: (1) produce milk with Se concentrations exceeding 225 mu g/kg on the five farms for pilot-scale production of a high protein milk powder; (2) validate a predictive relationship between Se intake and milk Se concentration developed in research; and (3) examine the time taken from the introduction of Se yeast to steady-state concentrations of Se in milk under a range of commercial farming conditions. We hypothesised that the relationship between Se intake and its concentration in milk found in research would apply on commercial farms. Daily Se intake, which was primarily from Se yeast in the pelleted concentrates, varied from 35 to 51 mg Se/cow. Grazed pasture and conserved forage contributed less than 1 mg Se/cow on all farms. The time taken from the introduction of pellets containing Se yeast to steady-state milk Se concentrations was 4-7 days. The steady-state Se concentrations in milk varied from 166 to 247 mu g/kg, but these concentrations were only 55-72% of predicted values. All the milk produced from the five farms on the last 2 days of feeding of Se-enriched pellets was used to produce a milk protein concentrate with a Se concentration of 5.4 mg/kg. Factors that might have affected Se incorporation into milk and the implications of these results for commercial production of high Se milk or milk products are discussed.

Item ID: 35766
Item Type: Article (Research - C1)
ISSN: 1836-0939
Keywords: commercial production, dairy cows, selenium yeast
Funders: Tatura Milk Industries Pty Ltd, Alltech Biotechnolgoy, Geoffrey Gardiner Dairy Foundation, Department of Primary Industries, Victoria
Date Deposited: 15 Oct 2014 16:46
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 100%
SEO Codes: 92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920411 Nutrition @ 50%
83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8305 Primary Animal Products > 830507 Unprocessed or Minimally Processed Milk @ 50%
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