Abstract
The objective of this study is to evaluate the length of different protocols of adaptation to high concentrate diets on cell proliferation and apoptosis of rumen epithelium of feedlot Nellore cattle. One hundred twenty Nellore yearling bulls (385 kg) backgrounded on pasture will be randomly allocated in 24 pens with five animals per pen (5,4 m² and 0,8 m bunk per animal) according to the …