To evaluate the effect of feeding longan residue (longan fruit; grade C) before estrus synchronization on
reproductive performance in sheep, sixteen ewes observed in estrus were selected and randomly assigned to 2 groups:
control group (n=8) received the maintenance diet whiles the longan-supplemented group (n=8) received the
maintenance diet plus 300 g DM/head/day of longan fruit for 17 days. Blood concentrations of glucose, insulin,
progesterone (P4), and estradiol (E2), and follicular population were recorded. After the nutritional treatments, all
ewes were synchronized for estrus with controlled intravaginal drug release (CIDR) devices and 400 IU pregnant
mare serum gonadotropin. Ewes exhibiting estrus were subjected to assisted natural mating by rams. Ewes fed
longan-supplemented diet had greater feed intake than ewes fed the control diet. Glucose concentrations were higher
in longan-supplemented than those in control ewes on days 7, 14, and 17. Insulin concentrations were only higher in
longan-supplemented group than those in control group on day 17. The longan-supplemented ewes had higher E2
concentrations than non-supplemented ewes on days 14 and 17. On days 14 and 17, numbers of total follicles had
significantly greater in longan-supplemented ewes compared with control ewes. Estrous response and conception
rate were not different between control and treatment ewes. It was concluded that the 17 days of dietary
supplementation stimulate ovary (total follicles) ready to respond to the synchronization of estrus. However, dietary
supplementation with longan fruit in ewes prior to the start of the estrus synchronization did not enhance
reproductive performance.