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Titolo:
Effect of glucose supply on fasting nitrogen excretion and effect of leveland type of volatile fatty acid infusion on response to protein infusion in cattle
Autore:
Orskov, ER; Meehan, DE; MacLeod, NA; Kyle, DJ;
Indirizzi:
Rowett Res Inst, Aberdeen AB21 9SB, Scotland Rowett Res Inst Aberdeen Scotland AB21 9SB , Aberdeen AB21 9SB, Scotland
Titolo Testata:
BRITISH JOURNAL OF NUTRITION
fascicolo: 5, volume: 81, anno: 1999,
pagine: 389 - 393
SICI:
0007-1145(199905)81:5<389:EOGSOF>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTRA-GASTRIC INFUSION; INTRAGASTRIC INFUSION; ENERGY UNDERNUTRITION; DAIRY-COWS; METABOLISM; SHEEP; NUTRIENTS; RUMINANTS; GROWTH; STEERS;
Keywords:
glucose requirement; intragastric nutrition; nitrogen excretion; volatile fatty acids; protein retention;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Orskov, ER Rowett Res Inst, Aberdeen AB21 9SB, Scotland Rowett Res Inst Aberdeen Scotland AB21 9SB AB21 9SB, Scotland
Citazione:
E.R. Orskov et al., "Effect of glucose supply on fasting nitrogen excretion and effect of leveland type of volatile fatty acid infusion on response to protein infusion in cattle", BR J NUTR, 81(5), 1999, pp. 389-393

Abstract

Two experiments were carried out on cattle nourished entirely by intragastric infusion, to determine the extent to which glucose or a glucose precursor determines the response to protein infusion in energy-undernourished animals. In order to determine the requirement for glucose in 1-year-old fasting cattle, glucose was infused at increments to supply 0, 1.5, 2.5, 3.5, 4.5, 5.5 and 6.5 g/kg metabolic body weight (W-0.75) and the effects on plasma beta-hydroxybutyrate and N excretion were measured. At 5.5 g glucose/kg W-0.75 plasma beta-hydroxybutyrate was reduced to a basal level of 1.65 mmol/l and fasting N excretion reduced from 529 to 280 mg N/kg W-0.75. No further reduction was observed with the higher level of 6.5 g glucose/kg W-0.75. In the second trial, three steers were used in a 3 x 3 Latin square designand infused with a volatile fatty acid mixture of 65, 27 and 8 mol acetic,propionic and butyric acids respectively/100 mel, either at an estimated maintenance energy level of 450 kJ/kg W-0.75 and supplying a calculated glucose equivalent level of 13.0 g/kg W-0.75 (M1A), Or at 1.5 x maintenance supplying a glucose equivalent of 20 g/kg W-0.75 (M1.5A). Another mixture infused at the maintenance energy level contained 49, 43 and 8 mol acetic, propionic and butyric acids respectively/100 mol but with a glucose equivalent of 20 g/ kg W-0.75 (M1P). Casein was infused at each of these energy treatments to supply 0, 200, 400, 800, 1600 and 2500 mg N/kg W-0.75 daily, and N balance and blood metabolites were measured. N retention increased linearly(r 0.98) with casein infusion. The coefficients for N retention were 0.55,0.57 and 0.64 for M1A, M1.5A and M1P respectively. The mean efficiency of N utilization was 0.58. The results suggest that provided the glucose need is met there is no relationship between energy supply and efficiency and level of protein retention. However, the results also indicate that glucose requirement in cattle may be higher than that previously observed in sheep.

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Documento generato il 25/01/21 alle ore 19:24:50