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The aim of this study was to study the effect of giving different levels of energy feed on the concentrations of estrogen and progesterone during estrus and on the 14th day after mating on thin-tail ewes. The material used in this study was 15 head of thin-tail ewes aged between 2.50-3.00 years had a normal estrus cycle and had once lambing. All ewes were randomly placed into three types of treatment of energy feed with different levels, namely: non-flushing 1.01Mcal / kg ME (f0), flushing 2.13Mcal / kg ME (f1) and flushing 2,31Mcal / kg ME (f2). Each treatment was repeated 5 times. The general linear model of SPSS was used to analyze variables measured. The results showed that the average estrogen concentration in thin-tailed ewes during estrus in the flushing group (f1 and f2) was higher than non- flushing (f0). The average progesterone concentration in the thin-tailed ewes on the 14th day after mating in the flushing group (f1 and f2) was higher respectively than the non-flushing group (f0). The increase in feed energy given to thin-tailed ewes in flushing, during estrus increases estrogen concentration and on the 14th day after mating, increase progesterone concentration.