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that is the difference, and it is significant.I grant that would be a very different amount than the amounts the cow would eat if the poultry litter is deliberately fed to them
To illustrate the point, think of a blob of infected fecal matter as the number 6 on a die. The chance of getting a 6 when throwing one die is 1 in 6, or about 17%. The chance of getting a 6 throwing 6 dice is about 66%. The chance of getting a 6 throwing 60 dice is essentially 100%.
The probability of a cow catching AI from eating infected matter in a field is vanishingly remote - perhaps still possible, but very unlikely. I don't think they'd eat a dead bird by accident, and that seems to be the route of transmission to mammals.
In contrast, mixed with other foodstuffs in such a way as to try to ensure that all pellets have the same nutritional content, infected material from carcasses buried in the litter and added to feed would be spread as far and wide as it could be. One would expect the litter to be treated before addition, but perhaps whatever's done to it is not sufficient to kill the virus.
In any case, the good news is that the outbreak is being taken seriously and quite a lot of scientists are now working to understand how it got into cattle in those states reporting it, and they've initiated many more tests on herds (no longer leaving it to producers to volunteer the information that their cows are sick with something new), so we should have proper explanations before too long.