![Shocked :o](http://www.dsboards.com/SMF/Smileys/classic/shocked.gif)
In a few episodes [spoiler]Barnabas and Willie will move to the Old House and Barnabas will tell Willie to go out now. Willie will be very nervous and afraid and not want to go. He will beg to not have to go. Barn will insist he go. Why would Willie be this nervous? Is he going out to bring calves to Barnabas? This is my guess.[/spoiler]
Willie could be bringing the calf to Barn somewhere near the Old House and Barnabas drank the blood killing it, then Willie had to dispose of it.
Or Barn could maybe bat to the calf and drink it's blood there, killing it and leaving it for the farmer to find. What Joe said leaves me to think it may have been this way, but somehow Willie had to be involved due to what I put in the spoiler above.
I think the blood on Willie's jacket was his own.
Alondra