NDLI: The effects of condensed tannins in sula (Hedysarum coronarium) on valine kinetics in the ovine mammary gland

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The effects of condensed tannins in sula (Hedysarum coronarium) on valine kinetics in the ovine mammary gland

Content Provider	Semantic Scholar
Author	Roy, Nicole C. Sinclair, B. R. Treloar, B. P. Kirk, Albert Peters, Justin S. Tavendale, Michael H. McNabb, Warren C.
Copyright Year	2004
Abstract	We tested the hypothesis that condensed tannins (CT) in Sulla (Hedysarum coronarium) increase the partitioning of essential amino acid (EAA) to the mammary gland in late lactating ewes. Lactating ewes (12) were surgically prepared with permanent indwelling arterio-venous catheters across the mammary gland, a cannula in the abomasum and a transonic flow probe fitted around the pudic artery at 1 week postpartum. All ewes were fed on fresh Sulla until the completion of the experiment. Two weeks after surgery (week 3 of lactation), half the ewes were orally drenched (4 times per day) with polyethylene glycol to remove the effects of the CT (PEG), whilst the remaining ewes (Control) received a drench of water according to a block design. At week 6 of lactation, a primed continuous infusion of [1-13C]-valine into the abomasum was used to quantify the kinetics of valine across the mammary gland, using a 2- or 3-compartment model. Blood was obtained by consecutive 2-h continuous blood sampling (6-12 h from the start of infusion) from the mesenteric artery and caudal superficial epigastric vein, to measure the isotopic enrichment and concentration of valine in plasma. Mammary blood flow tended to decrease (P 0.10). The rate of valine released from protein degradation was not affected (P>0.10) by treatments. These results suggest that the CT in Sulla increased mammary blood flow, supplying more valine (and other EAA), for mammary protein synthesis and/or oxidation.
Starting Page	148
Ending Page	151
Page Count	4
File Format	PDF HTM / HTML
DOI	10.1071/sa0401038
Alternate Webpage(s)	http://www.publish.csiro.au/sa/pdf/SA0401038
Alternate Webpage(s)	https://doi.org/10.1071/sa0401038
Volume Number	1
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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