Animal Welfare Professionals

I'm curious if anyone has insight into why the kittens are getting weighed before and after feeding according to this chart. Is this just how they are measuring the amount of food eaten or is there something else? At our shelter we use syringes with measurements indicated on the side to keep track of the amount fed and only weigh before the first feeding in the morning to gauge weight gain. I watched the presentation and it wasn't really talked about, understandably since it seems this was more geared towards marketing.