Infection during the First Gestation of Holstein Heifers That Consume Food Contaminated Naturally with Zearalenone under Field Conditions.

Background: This work studied the natural infection of during the first gestation of heifers in a dairy farm in animals consuming a ration co ntaminated naturally with Zearalenone (ZEA), and to find out effect of mycotoxin in the levels of estrogen (E) and progesterone (P4) and that's relation to the infection to and in the abortions.

Methods: The study was conducted in a dairy farm located in El Llano municipality, in Aguascalientes, Mexico, in 2013. Two groups were formed, the group "A" with 20 seronegative animals to , and group "B" with 20 seropositive.