title: [The energy metabolism of swine at a feed level of "live weight equilibrium"].
abstract: 10 castrated pigs each of a live weight (LW) of 35 kg and 115 kg were fed over 28 and 40 days resp. in a way that a live weight equilibrium was achieved. The pigs were kept individually and at a low mobility on perforated floors of zinc-plated sheet iron at an air temperature of 19 degrees C. The weighing 35 kg received 668 kJ ME/kg LW 0.75 per day and one half of the animals weighing 115 kg 635 kJ ME/kg LW 0.75 in a diet consisting of barley and bran. The other half of the animals weighing 115 kg received 514 kJ ME/kg LW 0.75 per day in a ration consisting barley, bran and dried skim milk. The crude protein content of the rations was 12.6 and 17.1% resp. of the DM, the crude fibre content amounted to 8-10% of the DM. Energy excretion in faeces and urine was calorimetrically measured. Up to the end of the experiment LW and the weight of the empty body (without ingesta) remained unchanged. For the measuring of energy retention, 4-5 zero animals each were analysed before the experiments. The pigs weighing 35 kg showed a daily loss of 39 g fat in the course of the 40-day experiment. The calculation of the energy balance showed that an intake of 790 kJ ME/kg LW 0.75 was necessary. This maintenance requirement, rather high in comparison with values from literature, can be explained with the emission of body heat on sheet iron floors and a crude fibre content of 9% in the rations. The pigs of the two groups of 115 kg LW were at an energy equilibrium at both nutrition levels. The lower maintenance requirement of the group fed with dried skim milk cannot exclusively be explained by the higher energetic utilization of the milk protein in the ration. The reason should be the more advanced age of the animals of the milk group. Although they had nearly the same live weight, their empty bodies contained 41% fat, the pigs of the barley/bran group, however, only 34%, both before and after the experiment.
authors.affiliation: Sektion Tierproduktion der Wilhelm-Pieck-Universität Rostock, Wissenschaftsbereich Tierernährung.
authors.forename: W
authors.initials: W
authors.lastname: Wiesemüller
authors.forename: S
authors.initials: S
authors.lastname: Poppe
authors.forename: W
authors.initials: W
authors.lastname: Hackl
mesh_terms: D000367:Age Factors; D000821:Animal Feed; D000818:Animals; D001823:Body Composition; D001835:Body Weight; D004044:Dietary Proteins / Q000378:metabolism; D004734:Energy Metabolism; D006799:Housing, Animal; D050356:Lipid Metabolism; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D013552:Swine / Q000254:growth & development / Q000378:metabolism*
chemical_list: D004044:Dietary Proteins; D009584:Nitrogen
vernacular_title: Untersuchungen über den Energieumsatz von Schweinen auf dem Fütterungsniveau "Lebendmassegleichgewicht".