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Influence of sucrose supplementation on nitrogen kinetics and energy metabolism in sheep fed with lucerne hay cubes

Published online by Cambridge University Press:  27 March 2009

Y. Obara ,
H. Fuse ,
F. Terada ,
M. Shibata ,
A. Kawabata ,
M. Sutoh ,
K. Hodate  and
M. Matsumoto
Y. Obara
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
H. Fuse
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
F. Terada
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
M. Shibata
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
A. Kawabata
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
M. Sutoh
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
K. Hodate
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
M. Matsumoto
Affiliation:
National Institute of Animal Industry, Tsukuba Norindanchi, PO Box 5, Ibaraki 305, Japan
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Summary

The effects of sucrose supplementation on nitrogen kinetics and energy metabolism were examined in sheep fed lucerne hay cubes using a 15N isotope dilution method and balance and respiration trials in Tsukuba, Japan in 1988. Sheep were fed lucerne hay cubes (1183 g DM/day), with or without 204 g/day sucrose, at 2 h intervals from continuous feeders. Supplementation with sucrose decreased urinary N excretion (P < 0·01), resulting in an increase in N retention from – 1·1 to + 2·0 g N/day (P < 0·01). Supplementation with sucrose resulted in no change in faeces and methane energy, a decrease in urinary energy (P < 0·01) and an increase in heat production and energy balance (P < 0·01). Sucrose supplementation also resulted in lower rumen ammonia (P < 0·05) and plasma urea concentrations (P < 0·05) and reduced urinary urea excretion (P < 0·01). The fermentation of sucrose in the rumen resulted in a decrease in rumen pH (P < 0·01) and in the acetate: propionate ratio (P < 0·05). Sucrose supplementation increased the proportion of urea transferred to the rumen (P < 0·05), non-ammonia N (NAN) concentration in the rumen (P < 0·001) and NAN flow from the rumen to the lower digestive tract (P < 0·001). Urinary allantoin excretion rate increased with sucrose supplementation (P < 0·05). The plasma glucose concentration was unchanged but plasma insulin concentration was increased with sucrose supplementation (P < 0·05). The influence of energy-rich supplements, such as sucrose, on N kinetics and the mechanism of the increase in N retention with sucrose supplementation are discussed.

Type
Animals
Information
The Journal of Agricultural Science , Volume 123 , Issue 1 , August 1994 , pp. 121 - 127
Copyright
Copyright © Cambridge University Press 1994

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