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- W200078800 abstract "We studied the effects of feed intake and fatness on metabolic clearance rate (MCR) and half-life of progesterone in 40 ovariectomized gilts (10x4 littermates). One gilt from each litter was randomly allocated to each of four treatments in a randomized block design. Gilts were reared to be either lean (Ln), 113 kg BW and 10 mm backfat measured 65 mm from the midline at the level of the last rib (P2), or fat (F), 124 kg BW and 20 mm P2 backfat. They were ovariectomized and fitted with bilateral jugular catheters. Fat and Ln gilts were then fed either low (1.15 x maintenance energy, L), or high (2.30 x maintenance energy, H) feed intakes. Gilts received an i.m. injection of 130 mg of progesterone on two consecutive days (d1 and 2). From d 3, progesterone was infused at 5.4 mg/h (130 mg/d) for 60 h. Blood samples for progesterone analysis were taken during the last 24 h of infusion and for a further 72 h. Gilts were then slaughtered, and livers were sampled for microsomal studies. Fatness did not affect any aspect of progesterone metabolism measured. Postprandial MCR was greater in H than in L gilts, 103.0 vs. 76.1 mL x min(-1) x kg BW(-1) (P<.01), respectively. Feed intake did not affect the disappearance rate constant of progesterone (mean -.019), and the estimated half-life of progesterone was 36.5 h. High-intake gilts had larger proportional liver size (P<.001) than L gilts. Microsomal metabolism of progesterone and P450 enzyme concentration were similar across treatments. We conclude that increasing feed intake increases MCR of progesterone and could be used to manipulate progesterone concentration in sows." @default.
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- W200078800 title "The effects of feed intake and body fatness on progesterone metabolism in ovariectomized gilts." @default.
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- W200078800 doi "https://doi.org/10.2527/1999.77123253x" @default.
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