Lysine flux in dry and lactating dairy goats

✍ Scribed by D.L. Brown

• Book ID: 103973966
• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 279 KB
• Volume: 1
• Category: Article
• ISSN: 0955-2863
• DOI: 10.1016/0955-2863(90)90007-8

✦ Synopsis

The objective of this experiment was to test the hypothesis that the physiological state of lactation is accompanied by both an increase in total plasma lysine flux (rate of loss and replacement of lysine) and a net reduction infux through the plasma lysine pool after accounting for lysine secreted in the milk. Eight lactating French Alpine does were primed and infused for three hours with solutions of etlSN Llysine HCI in 0.9% saline through indwelling jugular vein catheters. Enrichment of circulating plasma lysine by continuous intravenous infusion of ctl~N L-lysine was used to estimate whole body lysine flux. This procedure was repeated one month after cessation of milking. Total plasma lysine flux was similar for dry and lactating does (116.6 and 123.0 retool~d, SEM 16.6 mmol), but 54.2 mmol/d lysine was secreted as milk protein during lactation. Direct measurement of lysine absorption from the lower tract and independent measurement of lysine degradation are needed to provide a more complete portrait of caprine lysine kinetics.