Journal article
Selenium levels in cows fed pasture and concentrates or a total mixed ration and supplemented with selenized yeast to produce milk with supra-nutritional selenium concentrations
CR Stockdale, PM Shields, A McKenna, GP Walker, FR Dunshea, PT Doyle
Journal of Dairy Science | Published : 2011
Abstract
Seventy multiparous Holstein-Friesian cows were fed different amounts of pasture and concentrates, or a total mixed ration (TMR), for 42 d in mid-lactation to test the hypothesis that the concentration of Se in milk would depend on the amount of Se consumed, when the Se is primarily organic in nature, regardless of the diet of the cows. Of the 70 cows, 60 grazed irrigated perennial pasture at daily allowances of either 20 or 40kg of dry matter (DM)/cow. These cows received 1 of 3 amounts of concentrates, either 1, 3, or 6kg of DM/cow per day of pellets, and at each level of concentrate feeding, the pellets were formulated to provide 1 of 2 quantities of Se from Se yeast, either about 16 or 3..
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Funding Acknowledgements
Funding was provided by Tatura Milk Industries Pty. Ltd. (Tatura, Victoria, Australia), Alltech Biotechnology P/L (Dandenong South, Victoria, Australia), the Geoffrey Gardiner Dairy Foundation (Melbourne, Victoria, Australia) and the Victorian Department of Primary Industries (DPI). Tim Harrington of Ridley Agriproducts (Pakenham, Victoria, Australia) assisted with formulation of the Se-enriched pellets. Valuable technical assistance was provided by Marg Jenkin, Stuart Austin, Daryl Wilson, Shelly Warde, and Allan Thorson of the Victorian Department of Primary Industries and the farm staff at DPI Kyabram. Biometrics support was provided by Sorn Norng.