Timber cruiser, my opinion is that coyotes work on pigs more than we think. We have a lot of mature sows that give birth to 8-10 piglets. By the time those piglets are 3 months old there are usually 4 or less. I'm getting these numbers from camera surveys on bait sites. Also, a lot of reproduction research going on right now, and preliminary stuff is showing lower reproductive rates than what literature has been saying for years.
I agree on the reproduction rates. I have skinned a lot of sows and rarely find one with more than 7 little ones. 5 or 6 is more the norm.