Pilgrim's Pride of Mexico takes steps to protect breeder supply in Mexico Pilgrim's Pride has identified an increased mortality rate of the breeder flock at the company's complex located in the state of Guanajuato in central Mexico. Management is working closely with regulatory authorities to perform blood tests to check for whether H7N3 virus is present, but has already instituted preventative precautions. The identified complex has been isolated with additional biosecurity measures implemented. These measures include seeking and receiving authorization to vaccinate both breeders and grandparent stock in unaffected areas. The Guanajuato complex is responsible for a small amount of Pilgrim's Mexican hatching eggs. The majority of Pilgrim's hatching operations are strategically located in other states throughout Mexico.