title: Lysine maintenance requirement and efficiency of its utilisation in young pigs as estimated by comparative slaughter technique.
abstract: An experiment was carried out on weaner pigs (initial BW 10.8 kg) to estimate the maintenance requirement for lysine (Lys) and its marginal efficiency of utilisation using a comparative slaughter technique. Three groups of six pigs each were fed purified diets for 21 days supplying Lys at 19.5, 78 or 195 mg/kg W0.75, which corresponded to 50, 200 or 500% of the assumed maintenance requirement. All other essential amino acids were given at 50% excess. At the end of the experiment, pigs were killed for whole-body nitrogen (N) and amino acid analysis. A representative group of six pigs was analysed at the beginning of the experiment. Based on regression equations, relating Lys or N retention to Lys intake, Lys requirement for zero Lys retention was estimated to be 121 mg/kg W0.75, while Lys requirement corresponding to zero N retention was 41.7 mg/kg W0.75. At N equilibrium, the pigs lost 65 mg of Lys per kg W0.75 daily while at zero Lys retention, the daily N retention was 156 mg/kg W0.75 . The marginal efficiency of lysine utilisation was 0.91. It is concluded that zero lysine retention is a better criterion of lysine maintenance requirement than zero N retention.
authors.affiliation: Department of Nutrition, Research Institute of Animal Production, Slovak Agricultural Research Centre, Nitra, Slovakia. jheger@tiscali.cz
authors.forename: Jaroslav
authors.initials: J
authors.lastname: Heger
authors.forename: Peter
authors.initials: P
authors.lastname: Patrás
authors.forename: Sona
authors.initials: S
authors.lastname: Nitrayová
authors.forename: Juraj
authors.initials: J
authors.lastname: Karcol
authors.forename: Patricia
authors.initials: P
authors.lastname: Dolesová
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena / Q000502:physiology*; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development / Q000378:metabolism; D001823:Body Composition / Q000502:physiology; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005260:Female; D008239:Lysine / Q000008:administration & dosage* / Q000378:metabolism*; D008297:Male; D009584:Nitrogen / Q000378:metabolism; D009751:Nutritional Requirements; D013552:Swine / Q000254:growth & development / Q000378:metabolism*
chemical_list: D004044:Dietary Proteins; D008239:Lysine; D009584:Nitrogen