title: [The energy maintenance requirement of growing pigs of different sexes given normal and high protein diets. 3. Experiments in boars].
abstract: Six fattening boars each, hybrids of line 150(150 X (L X E] received rations with 17 and 45% crude protein. In the live weight range of 36 to 167 kg, 5 periods of growth feeding alternated with 4 periods of maintenance feeding. Compared with maintenance level the nutrition level of 2.7 did not have an influence on digestibility. Nitrogen retention was only insignificantly influenced by the level of protein supply. The maintenance requirement of the animals used was by 50% higher than in previous experiments made by our work team. On average it amounted to 1,017 KJ metabolizable energy per kg LW0.62, i.e. to 1,063 for those animals fed with rations containing 17% crude protein and to 986 for those animals receiving 45% crude protein in their rations. The utilization of metabolizable energy for energy retention amounted to 75% for rations with 17% crude protein and to 70% for rations with 45% crude protein. The partial utilization of metabolizable energy for fat retention was ascertained as 90% and for protein retention as 53% by means of multiply regressive assessment.
authors.affiliation: Forschungszentrum für Tierproduktion Dummerstorf-Rostock, Akademie der Landwirtschaftswissenschaften der DDR, Bereich Tierernährung Oskar Kellner.
authors.forename: W
authors.initials: W
authors.lastname: Jentsch
authors.forename: R
authors.initials: R
authors.lastname: Schiemann
mesh_terms: D000821:Animal Feed; D000818:Animals; D001833:Body Temperature Regulation; D002244:Carbon / Q000378:metabolism; D004044:Dietary Proteins / Q000378:metabolism*; D004063:Digestion; D004734:Energy Metabolism; D008297:Male; D008697:Methane / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D012044:Regression Analysis; D013552:Swine / Q000254:growth & development / Q000378:metabolism*; D015430:Weight Gain
chemical_list: D004044:Dietary Proteins; D002244:Carbon; D009584:Nitrogen; D008697:Methane
vernacular_title: Untersuchungen zum Energieerhaltungsbedarf wachsender Schweine verschiedenen Geschlechts bei normalen und hohen Proteingaben. 3. Mitteilung. Versuche an Ebern.