Investigations of empty body weight gain, on protein, fat and energy disposition as well as on utilization of metabolizable energy for energy deposition in black and white bulls. 1. Empty body weight gain

Abstract

Six series of individual feeding experiments (altogether 544 animals) with different energy supply and connected with steps slaughteries and whole-body analyses, constructed carried out and analysed upon the same aspects, were regression analytically interpreted with the aim of quantify the relation of empty body weight to live weight. The relation of empty body weight to live weight showed a nonlinear dependence on the live weight as well as on the age of animals. The assessment of the metabolizability of energy of the diet as an additional variable reduced the residual variation considerably. Therefore from the knowledge of live weight or age of the animals, and the metabolizability of energy of the diet the relation of empty body weight to live weight of black and white bulls could be calculated. Moreover, the relation of empty body weight gain to live weight gain in dependence on live weight and live weight gain was investigated.