Are crab apples harmful to cows?

Yes, crab apples can be harmful to cows. Crab apples contain a compound called amygdalin, which breaks down into hydrogen cyanide when ingested. Hydrogen cyanide is a highly toxic compound that can cause a number of health problems, including respiratory distress, cardiovascular collapse, and death. In addition, crab apples can also contain high levels of tannins, which can bind to proteins in the digestive tract and prevent them from being absorbed, leading to malnutrition.