![Charlie Neibergall FILE - A Jersey cow feeds in a field in Iowa, May 8, 2018. (AP Photo/Charlie Neibergall, File)](https://mapi.associatedpress.com/v2/items/3010d1b0c7c64bcdaa1693739bb3c794/preview/preview.jpg?s=680x)
FILE - A Jersey cow feeds in a field in Iowa, May 8, 2018. (AP Photo/Charlie Neibergall, File)
![Charlie Neibergall FILE - Chickens stand in their cages at a farm, in Iowa, Nov. 16, 2009. (AP Photo/Charlie Neibergall, File)](https://mapi.associatedpress.com/v2/items/0d65c6f118a841549249964d316618df/preview/preview.jpg?s=680x)
FILE - Chickens stand in their cages at a farm, in Iowa, Nov. 16, 2009. (AP Photo/Charlie Neibergall, File)
FILE - A Jersey cow feeds in a field in Iowa, May 8, 2018. (AP Photo/Charlie Neibergall, File)
FILE - Chickens stand in their cages at a farm, in Iowa, Nov. 16, 2009. (AP Photo/Charlie Neibergall, File)