Semiconfinamento de vacas em época de transição: visão prática

Abstract

The termination of cattle in pasture requires greater attention from producers and consultants regarding to pasture management, stocking rate, physiological stage of animals, race, sexual group, climatic conditions and, mainly, nutrition, which involves much of the success of the activity. In this sense, calculations of the nutritional requirements were performed using a computer diet formulation program BR-CORTE 3.0 (BRC) to evaluate a dietary formulation for batches of semi-finished beef cows. Due to the climatic conditions in the field being the transition from drought to water, it was necessary to observe the physiological development of the forage inserted in the system, in order to evaluate if there was a substitutive effect. Field average daily weight gain (GMD) results were observed and compared with performance predicted by the BRC. Regarding the methodology, a case study was launched from the collection of information such as fasting body weight of initial no pregnant cows (PCJngi) and fasting body weight of final no pregnant cows (PCJngf). The study showed quantitative differences when comparing the weight gain in the field with the performance prediction established by BR-CORTE, making that in the theoretical terms the diet did not meet the requirements of crude protein (PB) and energy (NDT), meeting the requirement in terms of phosphorus (P), and in the field Lot 1 exceeded the estimated gain established by the program and the others did not meet the predicted gain potential.