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Volume 91, Issue 10 , Pages 3814-3823 , October 2008

Nutrition, Metabolism, and Fertility in Dairy Cows: 1. Dietary Energy Source and Ovarian Function

Received 18 January 2008 ,Accepted 19 May 2008.

Mean plasma concentrations of progesterone in groups (n=6 per group) of lactating Holstein-Friesian cows fed diets varying from high starch (1) to high fat (5). Cycles were synchronized and data then

Mean plasma concentrations of progesterone in groups (n=6 per group) of lactating Holstein-Friesian cows fed diets varying from high starch (1) to high fat (5). Cycles were synchronized and data then aligned to day of ovulation. Diets 1 to 5 contained 231, 183, 159, 135, and 87g of starch and 39, 42, 43, 45, and 48g of fat/kg of DM, respectively. ^aMean progesterone was lower (P=0.039) for diet 1 than for the other diets on d 5.
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