Journal article
Effects of partial mixed rations and supplement amounts on milk production and composition, ruminal fermentation, bacterial communities, and ruminal acidosis
HM Golder, SE Denman, C McSweeney, WJ Wales, MJ Auldist, MM Wright, LC Marett, JS Greenwood, MC Hannah, P Celi, E Bramley, IJ Lean
Journal of Dairy Science | ELSEVIER SCIENCE INC | Published : 2014
Abstract
Late-lactation Holstein cows (n = 144) that were offered 15. kg dry matter (DM)/cow per day of perennial ryegrass to graze were randomized into 24 groups of 6. Each group contained a fistulated cow and groups were allocated to 1 of 3 feeding strategies: (1) control (10 groups): cows were fed crushed wheat grain twice daily in the milking parlor and ryegrass silage at pasture; (2) partial mixed ration (PMR; 10 groups): PMR that was isoenergetic to the control diet and fed twice daily on a feed pad; (3) PMR+canola (4 groups): a proportion of wheat in the PMR was replaced with canola meal to produce more estimated metabolizable protein than other groups. Supplements were fed to the control and ..
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Funding Acknowledgements
The authors acknowledge staff at the Department of Environment and Primary Industries (Ellinbank, VIC, Australia) for provision of ruminal fluid samples and milk measures data. This work was supported by Department of Environment and Primary Industries (VIC, Australia), Dairy Australia (Southbank, VIC, Australia), SBS cibus (Camden, NSW, Australia), DairyNSW (Mudgee, NSW, Australia), The CSIRO Animal, Food and Health Services (St. Lucia, QLD, Australia), and The University of Sydney (Camden, NSW, Australia). The authors also acknowledge the staff at CSIRO Animal, Food and Health Services (St. Lucia, QLD, Australia) for laboratory assistance, in particular Vicki Whan.