title: Physiologic and body composition changes in feeder pigs under simulated marketing conditions.
abstract: Two experiments were conducted to determine changes in body composition and various physiologic variables in feeder pigs under simulated marketing conditions. In the first experiment, pigs were assigned to 1 of 4 treatment groups for 48 hours: (1) no water and feed; (2) water ad libitum, no feed; (3) no water, feed ad libitum; or (4) water and feed ad libitum. During a 48-hour recovery period, all pigs were allowed feed and water ad libitum. Plasma triiodothyronine decreased (P less than 0.01) within the first 24 hours in groups-1 and -2 pigs, but increased (P less than 0.01) within the first 6 hours of the recovery period. The circadian rhythm of plasma cortisol was disrupted in groups-1 and -3 pigs and during recovery in group-1 pigs. Packed cell volume increased (P less than 0.05) in groups-1 and -3 pigs and returned to initial values within the first 24 hours of the recovery period. In the second experiment, body composition was estimated by the 40K technique for fat-free body mass, percentage of nitrogen, and percentage of fat. Body composition was determined before and after pigs were allotted to 1 of 2 groups for 48 hours: group-1 pigs were given feed and water ad libitum and group-2 pigs were not given feed and water. Group-1 pigs gained 2.2 kg of body weight (P less than 0.01), 0.6% fat (P less than 0.01), 0.7 kg of fat-free body mass, and 0.02% nitrogen (P greater than 0.01).(ABSTRACT TRUNCATED AT 250 WORDS)
authors.affiliation: Animal Physiology and Nutrition Research Unit, USDA, University of Missouri, Columbia 65211.
authors.forename: B A
authors.initials: BA
authors.lastname: Becker
mesh_terms: D000818:Animals; D001786:Blood Glucose / Q000032:analysis*; D001806:Blood Urea Nitrogen; D001835:Body Weight / Q000502:physiology*; D005508:Food Deprivation / Q000502:physiology*; D008297:Male; D013552:Swine / Q000097:blood / Q000502:physiology*; D013997:Time Factors; D014284:Triiodothyronine / Q000097:blood; D014868:Water Deprivation / Q000502:physiology*; D015430:Weight Gain / Q000502:physiology*; D015431:Weight Loss / Q000502:physiology
chemical_list: D001786:Blood Glucose; D014284:Triiodothyronine