PMID: 6412740Sep 1, 1983Paper

Glucose production and utilization in non-pregnant, pregnant and lactating ewes

The British Journal of Nutrition
S WilsonP J Buttery

Abstract

By using continuous infusions of 3H- and 14C-labelled substrates, three-pool models, incorporating rumen propionate, plasma glucose and blood carbon dioxide were constructed to determine the contribution of propionate to glucose in non-pregnant, pregnant (mid and late) and lactating hill ewes. Although the intakes of non-pregnant and pregnant ewes were the same (1200 g dried grass/d) and resulted in similar levels of propionate production (33 g C/d), glucose production rate (GPR) increased from 44 g C/d in the non-pregnant ewes to 62 g C/d in the ewes carrying twins in late pregnancy. In lactating ewes given 2500 g dried grass/d, propionate production increased to 56 g C/d and GPR increased to 93 and 104 g C/d in ewes suckling single and twin lambs respectively. There was an increase in the percentage of the propionate resource which was diverted to glucose, from 37% in the non-pregnant ewes and ewes in mid-pregnancy, to 55% in late pregnancy and 60% in lactation. In spite of this apparent metabolic adaptation to the additional requirements for glucose, approximately 55% of the glucose-C was supplied by metabolites other than propionate and CO2. From the determination of plasma glycerol concentrations it was estimated that the ...Continue Reading

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Citations

Sep 1, 1989·The British Journal of Nutrition·H A Abdul-Razzaq, R Bickerstaffe
Sep 1, 1990·The British Journal of Nutrition·B J LeuryA W Bell
Jun 1, 1984·The Proceedings of the Nutrition Society·J A Milne, R W Mayes
Jul 6, 2007·Research in Veterinary Science·Christina Schlumbohm, J Harmeyer
Feb 6, 2004·Journal of Dairy Science·C Schlumbohm, J Harmeyer
Jul 1, 1989·The British Journal of Nutrition·M E SymondsM A Lomax
May 1, 1993·The International Journal of Biochemistry·Q J LuoP W Scislowski

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