I only received this ROI request yesterday and I note that the slide has already been presented. Hard to comment on the content as there is no context to the slide - the title states "Evaluation of restricted grazing strategies for reducing greenhouse gas emissions from grazed dairy pasture - slide showing costs" - are there other slides which need ROI approval? Regarding the presented slide - the text states "To maximise pasture utilisation and reduce pugging, two short grazing events after each milking (e.g. 4 hours/grazing) per day best (sic)" - however the figures do not mention number of grazing events at all. 
