The use of different doses of intramuscular progesterone for sexual activity induction in anestrous goats (26°N) was evaluated. During late May, mix-breed anovulatory adult goats (n = 15) were divided in 2 homogeneous groups regarding body condition score and body weight; 4 mix-breed bucks treated with testosterone were also used. Does grazed from 1000h to 1600h. Group 1 (10 mg; n = 7) received 10 mg i.m. progesterone + 200 IU i.m. eCG, while group 2 (20 mg; n = 8) received 20 mg i.m. progesterone + 200 IU i.m. eCG. Does were penned and kept there during 5-d and were fed with alfalfa hay ad libitum, 200 g commercial mix (14% CP, per animal/d) and trace mineral salt blocks and water ad libitum. Estrus activity was evaluated by introducing a male in each experimental group 15 min (morning) 15 min (noon) and 15 min (afternoon). Females depicting signs of heat were moved to a different pen with 2 males. A transrectal ultrasonographic scanning (TUS) was performed to detect ovulation (10 d) and pregnancy (45 d) after estrus detection. The percentage of females depicting estrus, ovulation and pregnancy were compared with a chi2. Reproductive response from both experimental groups is presented on Table 1. Results obtained allow us to conclude that administration of intramuscular progesterone, at 10 or 20 mg, induces sexual activity of goats during the normal anestrous season. Table 1. Reproductive response of mixed-breed anestrous goats receiving either 10 or 20 mg i.m. progesterone

Sexual response	Group
10 mg	20 mg
Estrus (no.)	6/7a	7/8a
Ovulation (no.)	7/7a	8/8a
Gestation (no.)	5/6a	5/8a

^a,bDifferent superscript within variables denote differences P < 0.05.