Ono M, Ohtaki T, Nakahashi T, Tsumagari S. Effect of feed restriction on hepatic estradiol metabolism and liver function in cows.
J Vet Med Sci 2019;
81:1873-1878. [PMID:
31723071 PMCID:
PMC6943328 DOI:
10.1292/jvms.19-0178]
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Abstract
In this study, the effects of restriction feeding on the liver function, hepatic uridine
diphosphate glucuronosyltransferase (UGT) activity, hepatic insulin-like growth factor
(IGF)-1 mRNA expression and response to high-dose estradiol-17β (E2)
administration were investigated in non-lactating cows. Cows were assigned to either
restricted feeding (30% of total digestible nutrient requirement) or ad
libitum feeding of a dent corn-based concentrate and roughage for a 2-week
feeding trial (Day 1=day of beginning the feeding trial). On day 14, a high-dose
E2 administration study was carried out to examine plasma E2
levels as an indicator of hepatic E2 metabolism. Plasma E2
concentration in the restricted feeding group was consistently higher after high-dose
E2 administration than in the control group. In addition, indocyanine green
half-life value was prolonged by restricted feeding for 13 days, and increased liver
triglyceride concentration and decreased liver UGT activity were caused by this
restriction over 14 days. Restricted feeding did not affect plasma IGF-1 concentration or
hepatic IGF-1 mRNA expression. These results suggest that two weeks of restriction feeding
led to accumulation of triglyceride, decreased liver blood flow, and slightly impaired
liver function, which in turn slowed down the hepatic metabolism of E2 without
significantly impacting hepatic IGF-1 production.
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