title: [The energy maintenance requirement of growing pigs of different sexes given normal and high protein diets. 1. Experiments in castrates].
abstract: Energy retention was measured alternately at 12 barrows, fattening hybrids of line 150 (150 X (L X E], at maintenance level (4 periods) and growth feeding (5 periods) in the live weight range between 32 and 134 kg, 6 animals each received rations with 17 and 45% crude protein resp. during the complete experimental period. The nutrition level did not have a significant influence on the digestibility level of the feed. The experiments carried out at maintenance level showed that the maintenance requirement of metabolizable energy in the experiments with 17% crude protein in the ration was 941, in the experiments with 45% crude protein in the ration 913kJ ME/kg LW0.62 and on average 927 kJ ME/kg LW0.62. Including the experiments with growth feeding one can conclude from a regression analysis, largely in agreement with the measured values, that 955 kJ ME/kg LW0.62 is the energy maintenance requirement. These values of maintenance requirement are by 50% higher than those derived from previous measurings. In contrast to expectations, the increase of protein concentration in the ration did not result in a higher energy maintenance requirement. The utilization of metabolizable energy for retention amounted to 74% for rations with a normal protein content and to 65% for those with a high protein content. The multiply regressive evaluation showed a utilization of metabolizable energy for fat retention of 79% and for protein retention of 53%.
authors.affiliation: Forschungszentrum für Tierproduktion Dummerstorf-Rostock, Akademie der Landwirtschaftswissenschaften der DDR, Bereich Tierernährung Oskar Kellner.
authors.forename: R
authors.initials: R
authors.lastname: Schiemann
authors.forename: W
authors.initials: W
authors.lastname: Jentsch
authors.forename: L
authors.initials: L
authors.lastname: Hoffmann
mesh_terms: D000273:Adipose Tissue / Q000378:metabolism; D000821:Animal Feed; D000818:Animals; D001833:Body Temperature Regulation; D002244:Carbon / Q000378:metabolism; D004041:Dietary Fats / Q000378:metabolism; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism*; D004063:Digestion; D004734:Energy Metabolism; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D012044:Regression Analysis; D013552:Swine / Q000254:growth & development / Q000378:metabolism*; D015430:Weight Gain
chemical_list: D004041:Dietary Fats; D004044:Dietary Proteins; D002244:Carbon; D009584:Nitrogen
vernacular_title: Untersuchungen zum Energieerhaltungsbedarf wachsender Schweine verschiedenen Geschlechts bei normalen und hohen Proteingaben. 1. Mitteilung. Versuche an Kastraten.