Crossing the border is always subject to current circumstances. So, since there was an outbreak of bird flu in the US, you can expect border guards to be more vigilant and restrictive to poultry entrance, particularly if you are crossing near or have travelled through where an outbreak has occurred.
We have over the years been questioned about potatoes, onions, beef, or citrus when entering the US. Similarly, eggs, poutry, potatoes (blight) when coming to Canada. Unless you call the border crossing to get current restrictions, you will never know if there is a problem.
All that to say, we have never had difficulty or lost food going either way in all the years that we have crossed, but we also kept current about any disease outbreaks, so didn't bring those items with us. It is no different from the agriculteral inspection stations that you must go through when entering some states, ie California.
Ed