I know the balls fit in the calf's nostrils...wonder what the spikes are for? Possibly to keep the calk from nursing? If so, then I wonder how the thing stayed in place!
Yep, that's what it is and yep they work too. They're used when the calf is older and eating grass/feed/hay but still wanting to nurse. I think the longest it took to break a calf from nursing was like 2 weeks.