REVIEW PAPER
Implications of fasting on the energy metabolism and feed evaluation in ruminants
 
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1
Bangladesh Livestock Research Institute, Savar, Dhaka, Bangladesh
 
2
The Rowett Research Institute, Greenburn Road, Bucksburn, Aberdeen AB2 9SBH
 
 
Publication date: 1994-11-04
 
 
J. Anim. Feed Sci. 1994;3(3):161-169
 
KEYWORDS
ABSTRACT
Fasting metabolism is adapted to ensure the orderly mobilization of endogenous substrates and fuel for maintaining vital activity. When no exogenous energy is consumed it gives rise to a glucose deficient condition; as a result gluconeogenesis from amino acids occurs which results in a higher excretion of N and a higher heat production. When therefore fasting metabolism is adopted as the reference level of metabolism when assessing energetic efficiency, efficiency appears higher below energy maintenance (Km) than above (Kf). When enough feed is given to meet the glucogenic demand of an animal, but no more, heat production falls to a minimum, which suggests that this value, rather than fasting heat loss, would be the appropriate base for measuring the energetic efficiency of exogenous feed. In general about one-third of energy maintenance (150 kJ/kg W0.75 daily or 20 mmol of glucose/kg W0.75 daily) should be used for obtaining this minimum metabolic state in ruminants.
 
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Estimation of the maintenance energy requirements, methane emissions and nitrogen utilization efficiency of two suckler cow genotypes
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Effect of slow release urea supplementation on fattening of steers fed sugar cane tops (Saccharum officinarum) and maize (Zea mays): ruminal fermentation, feed intake and digestibility
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The influence of body condition and level of feeding on the heat production of nonpregnant, nonlactating dairy cows
R Agnew, J Birnie, F Gordon, T Yan
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C. Yang, C. Wang, Y. Zhao, T. Chen, A. Aubry, A. Gordon, T. Yan
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Variations in the energy metabolism of the alpaca (Vicugna pacos). An evaluation by effect of prolonged fasting
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C.M. Wang, T. Yan, K.L. Xie, S.H. Chang, C. Zhang, F.J. Hou
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Energy: Protein Ratio in Ruminants: Insights from the Intragastric Infusion Technique
Denis Meehan, Ana Cabrita, Margarida Maia, António Fonseca
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A simple biochemical plasma test as an indicator of maternal energy balance predicts offspring survival in bighorn sheep
Connor Laliberte, Anne Devan-Song, Julia Burco, Claire Couch, Morgan Gentzkow, Robert Spaan, Clinton Epps, Brianna Beechler
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Derivation of the maintenance energy requirements in Jersey cows differing in body condition score
A.L. Carroll, P.J. Kononoff
Journal of Dairy Science
 
ISSN:1230-1388
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