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Titolo:
EFFECTS OF LONG-TERM PROTEIN EXCESS OR DEFICIENCY ON WHOLE-BODY PROTEIN-TURNOVER IN SHEEP NOURISHED BY INTRAGASTRIC INFUSION OF NUTRIENTS
Autore:
LIU SM; LOBLEY GE; MACLEOD NA; KYLE DJ; CHEN XB; ORSKOV ER;
Indirizzi:
ROWETT RES INST,GREENBURN RD BUCKSBURN AB2 9SB ABERDEEN SCOTLAND
Titolo Testata:
British Journal of Nutrition
fascicolo: 6, volume: 73, anno: 1995,
pagine: 829 - 839
SICI:
0007-1145(1995)73:6<829:EOLPEO>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRA-GASTRIC INFUSION; YOUNG GROWING SHEEP; FOOD-INTAKE; DIETARY-PROTEIN; METABOLISM; LEUCINE; ENERGY; NITROGEN; STEERS; PIGS;
Keywords:
WHOLE-BODY PROTEIN TURNOVER; INTRAGASTRIC NUTRIENT INFUSION; SHEEP;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
S.M. Liu et al., "EFFECTS OF LONG-TERM PROTEIN EXCESS OR DEFICIENCY ON WHOLE-BODY PROTEIN-TURNOVER IN SHEEP NOURISHED BY INTRAGASTRIC INFUSION OF NUTRIENTS", British Journal of Nutrition, 73(6), 1995, pp. 829-839

Abstract

The effect of long-term dietary protein excess and deficit on whole-body protein-N turnover (WBPNT) was examined in lambs nourished by intragastric infusions of nutrients. Ten sheep were given 500 mg N/kg metabolic weight (W-0.75) per d from casein for 2 weeks and then either 50(L), 500 (M) or 1500 (H) mg N/kgW(0.75) per d for 6 weeks. Volatile fatty acids were infused at 500 kJ/kgW(0.75) per d. Daily WBPNT was measured by continuous intravenous infusion of [1-C-13]leucine 3 d before, and on days 2, 21 and 42 after the alteration in protein intake. Whole-body protein-IV synthesis (WBPNS) was calculated as the difference between WBPNT and the protein-N losses as urinary NH3 and urea. Whole-body protein-N degradation (WBPND) was then estimated from WBPNS minusprotein gain determined from N balance. Fractional rates of WBPNS andWBPND were calculated against fleece-free body N content, WBPNS ratesat the L, M and H intakes were respectively 35 . 1, 41 . 5 amd 63 . 7g/d (P ( 0 . 001) on average over the 6 weeks and WBPND rates were 39. 5, 41 . 1 and 56 . 8 g/d (P < 0 . 001). The fractional rates of WBPNS were 5 . 01, 6 . 37 and 7 . 73% per d (P < 0 . 001) while those of WBPND were 5 . 64, 6 . 29 and 6 . 81% per d (P < 0 . 005) respectively. On days 2, 21 and 42, WBPNS rates at intake H were 54 . 0, 61 . 8 and 75 . 4 g/d (P = 0 . 03) respectively, and WBPND rates were 43 . 2, 56 . 4 and 70 . 9 g/d (P = 0 . 03); at intake L the amounts were 38 . 2, 34 . 2 and 32 . 8 g/d for WBPNS (P = 0 . 003) and for WBPND were 43 . 4, 38 . 0 and 36 . 9 g/d (P = 0 . 016) respectively. There were no significant (P > 0 . 05) differences in fractional rates of WBPNS and WBPND with time at either the L or H intake. We concluded that absoluteprotein turnover was affected both by dietary protein intake and by body condition while the fractional rate of turnover was predominantly influenced by intake.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/01/21 alle ore 01:11:37