Energy requirement of growing bulls, heifers and steers (German Simmental)

Schwarz, F.J.; Kirchgessner, M.; Heindl, U.

Journal of Animal Physiology and Animal Nutrition 73(1): 27-37


ISSN/ISBN: 0931-2439
Accession: 002611791

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Following on from previous experiments that investigated daily deposition of fat, protein and energy in different finishing periods (200-350, 350-500, 500-650 kg), deposition of fat, protein and energy, and energy requirement for various weight gains and liveweights was estimated in German Simmental bulls, heifers and steers. Use of a regression equation resulted in a daily empty-body weight gain to daily liveweight gain ratio of 0.95. Under intensive feeding conditions, daily deposition of fat was independent of daily liveweight gain and higher than with restricted feeding. With increasing liveweight gain within the same weight in all sexes and during the whole finishing period, fat deposition increased. With increasing body weight with the same liveweight gain, daily fat deposition increased. In contrast to daily fat deposition, protein deposition was lower under intensive feeding than under restricted feeding. In bulls and steers, protein deposition increased with increasing liveweight gain, whereas in heifers, no change was seen. Increasing body weight slightly reduced protein deposition in heifers and steers, whereas in intensively fed bulls (>500 kg), protein deposition increased. Daily deposition of energy as a result of protein and fat deposition, showed an analogous development depending on finishing period, feeding intensity and sex. The daily requirement for ME was estimated using daily deposition of energy, utilization of ME for energy deposition, and the energy requirement for maintenance. Within identical daily weight gain and with increasing body weight, the energy requirement was influenced by the increasing energy requirement for maintenance and the specific deposition of energy. Within the same liveweight gain and body weight, heifers always showed the highest, and bulls the lowest, energy requirement. The requirement of steers was between that of heifers and bulls.