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Feed sorting consists in the natural behavior of cattle to selectively consume the various feeds of the diet according to the particle size. The objective of this work was to determine the intake pattern and feed sorting of 36 non-castrated males (18 Nellore and 18 F1 Angus × Nellore) fed diets containing either fixed or variable nutritional levels, and house in individual or collective pens. Intake pattern and feed sorting were measured on days 13, 27, 41, 55, 69, and 83 days after the beginning of the experiment in three times post-feeding (4, 10, and 24 hours). The experimental design utilized was completely randomized in a factorial scheme 2 × 2 × 2 (two genetic groups, two diets, and two types of housing). Animals belonged to the F1 genetic group and housed in collective pens increased (P<0.05) the intake pattern from 0-4, 4-10, and 10-24 hours post-feeding compared with Nellore animals. Likewise, F1 Angus × Nellore animals increased (P<0.05) the preference for the fine particles (<4 mm) of the diet (101.13 vs. 112.76 ± 2.65% for the Nellore vs. F1 Angus × Nellore, respectively), whereas Nellore animals sorted for (P<0.05) the medium particles (<19, >8 mm) of the ration (127.70%) and the F1 genetic group sorted against (P<0.05) this same particle class (79.89%). The F1 Angus × Nellore genetic group increase feed intake pattern and the preference for the smaller particles of the ration. The use of a variable diet is not recommended to beef cattle finished in feedlot.

brazilian journal of development

INTAKE PATTERN AND FEED SORTING OF TWO BEEF CATTLE GENETIC GROUPS FED DIFFERENT NUTRITIONAL STRATEGIES / PADRÃO DE ALIMENTAÇÃO E CONSUMO SELETIVO DE DOIS GRUPOS GENÉTICOS DE BOVINOS DE CORTE ALIMENTADOS COM DIFERENTES ESTRATÉGIAS NUTRICIONAIS