Abstract
This study will be conducted in order to assess the factors related to the use of anthelmintics in Nellore, Simmental and cross-breed Nellore x Simmental young cattle naturally infected with gastrointestinal nematodes. Forty to 70 calves with 90 days of initial age and raised in four different farms will be evaluated. Calves will be kept in the same pasture, divided into three groups as f…