You can just post off samples, to nmr, some of us goatkeepers do monthly milk recording, Ayshire goat club only one left in scotland doing milk recording at the moment, we have sample pots with preservative fill with milk and i do extra seal with insulation tape and put in plastic bag and jiffy bag, post to secretary who puts everyones in box and takes to lab think she actually works at the lab in Ayr.
Ask for diy kit posted to you from NMR or maybe worth seeing if ayrshire goat club could add in your cow samples in along with the goats as you have to pay for a box of samples regardless of how many there are. Thats how milk recording clubs work well by sharing out the cost, more that do it the cheaper it is for all. We get butterfat%, protein % and somatic cell count back.