Effect of level of metabolizable protein on splanchnic flux of amino acids in lactating dairy cows

Journal of Dairy Science
G RaggioH Lapierre

Abstract

The response of splanchnic tissue metabolism to different levels of metabolizable protein (MP) was measured in 6 catheterized multiparous lactating Holstein cows. Three diets, balanced to provide similar energy intakes and increasing amounts of MP (g/d)-1922 (low), 2264 (medium), and 2517 (high)-were fed during 21-d experimental periods according to a replicated Latin square. On d 18, 19, or 20, six hourly blood samples were collected simultaneously from the portal and hepatic veins plus an artery to determine net fluxes of nutrients across the portal-drained viscera and the liver. Yields of milk and protein increased, as did urinary N excretion with increasing MP. Portal absorption of essential amino acids (EAA) increased linearly with increasing MP supply, as did liver removal of His, Met, and Phe. In contrast, liver removal of the branched-chain AA (BCAA) and lysine was unaffected by diets. With increasing MP, the ratio of milk output to postliver supply of BCAA, Thr, and Lys decreased linearly, indicating oxidation of these AA in the peripheral tissues. Concomitant to a decreased catabolism of EAA in the liver (His, Met, Phe, and Thr) and/or in peripheral tissues (BCAA, Lys, and Thr), the efficiency of transfer of absorbed ...Continue Reading

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Citations

Jul 1, 2010·Animal : an International Journal of Animal Bioscience·S CalsamigliaA M van Vuuren
Feb 27, 2015·The British Journal of Nutrition·G Cantalapiedra-HijarH Fouillet
Aug 19, 2007·Journal of Dairy Science·L DoepelH Lapierre
Aug 9, 2017·Tropical Animal Health and Production·Abdelfatah Abdelsalam MustafaJawid Sediqi
Jul 31, 2018·Asian-Australasian Journal of Animal Sciences·Tae-Il KimVijayakumar Mayakrishnan
Mar 11, 2006·Journal of Dairy Science·H LapierreG E Lobley
May 17, 2006·Journal of Dairy Science·T L WeekesJ P Cant
Sep 19, 2009·Journal of Dairy Science·D Vyas, R A Erdman
Mar 4, 2014·Journal of Dairy Science·S I Arriola ApeloM D Hanigan
Sep 17, 2013·Journal of Dairy Science·H N PhuongP Schmidely
Feb 1, 2008·Animal : an International Journal of Animal Bioscience·S I Borucki CastroR Berthiaume
Apr 1, 2008·Animal : an International Journal of Animal Bioscience·B A RøjenN B Kristensen
Mar 1, 2009·Animal : an International Journal of Animal Bioscience·H LapierreG E Lobley
May 1, 2007·Animal : an International Journal of Animal Bioscience·I ScheiH Volden
May 1, 2007·Animal : an International Journal of Animal Bioscience·I ScheiH Volden
Jul 29, 2011·Animal Science Journal = Nihon Chikusan Gakkaihō·Taketo ObitsuKohzo Taniguchi
May 11, 2012·Journal of Animal Science·H LapierreS Lemosquet
Jun 12, 2018·Current Drug Metabolism·Feiran WangShengli Li
Sep 16, 2019·Journal of Dairy Science·A J FlemingM D Hanigan

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