There is something odd that I can not figure out. If an animal devours some part of a persons's crops then in the Gemara in Bava Metzia it says you measure one part from 60. That is you do not measure just the amount of that one small area because that will be too expensive if someone would buy it alone. Nor do you measure by the whole field. Rather you go by 60 times that area and then take 1/60 of the crops value.

The question I gave came up a week or two ago when I was looking briefly at the Mishna in Bava Kama where it has the exact same case but it says you measure the amount of a field needed to plant two seahs.[Not like the Gemara in Bava Metzia.] I recall learning that part in Bava Metzia with David Brosnon and then for some reason I looked at the Aruch Hashulchan and saw how he explains Tosphot over there But I do not recall anyone mention the mishna in Bava Kama.