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Relationship between level of forage intake, blood flow and oxygen consumption by splanchnic tissues of sheep fed a tropical grass forage
Author(s) -
Hentz F.,
Kozloski G. V.,
Zeni D.,
Brun M. V.,
Stefanello S.
Publication year - 2017
Publication title -
journal of animal physiology and animal nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.651
H-Index - 56
eISSN - 1439-0396
pISSN - 0931-2439
DOI - 10.1111/jpn.12519
Subject(s) - splanchnic , blood flow , dry matter , zoology , hay , forage , latin square , cynodon , oxygen , medicine , biology , endocrinology , chemistry , food science , agronomy , rumen , organic chemistry , fermentation
Summary Four Polwarth castrated male sheep (42 ± 4.4 kg live weight ( LW ) surgically implanted with chronic indwelling catheters into the mesenteric, portal and hepatic veins, housed in metabolism cages and offered Cynodon sp . hay at rates (g of dry matter (DM)/kg LW) of 7, 14, 21 or ad libitum, were used in a 4 × 4 Latin square experiment to evaluate the effect of the level of forage intake on blood flow and oxygen consumption by the portal‐drained viscera ( PDV ), liver and total splanchnic tissues ( ST ). The portal blood flow and the oxygen consumption by PDV linearly increased at increased organic matter ( OM ) intake. No effect of level of OM intake was obtained for the hepatic artery blood flow and oxygen consumption by liver. As a consequence, the level of OM intake only tended to directly affect hepatic blood flow and oxygen consumption by total ST . Oxygen consumption was linearly and positively related to blood flow across PDV , liver and total ST . The heat production by PDV and total ST , as proportion of metabolizable energy ( ME ) intake, decreased curvilinearly at increased ME intake. In conclusion, the oxygen consumption by PDV , but not by liver, was directly related to the level of forage intake by sheep. Moreover, when ingested at levels below maintenance, most of ME was spent as heat produced by ST .