Effects of melatonin supplementation prior to Ovsynch protocol on ovarian activity and conception rates in anestrous Murrah buffalo heifers during out of breeding season.

Buffalo heifers have tendency to show anestrus during summer season. Melatonin has been used for correcting summer dependent anestrous via inducing resumption of ovarian activity. Therefore, the investigation was conducted to compare efficacy of melatonin for induction of estrus and conception rate with Ovsynch protocol in summer anestrous Murrah buffalo heifers.

Involvement of opioids and catecholamines in stress modulation of LH secretion in the male pig.

The effects of different acute stressors on LH secretion and their possible interactions with opioidergic and catecholaminergic-modulation of LH secretion were investigated using gonadectomized male miniature pigs. Nose-snare (NS) or high intensity cracker blast (CB) or ACTH (1 iu/kg BW) was administered 3h after start of blood sampling. Animals also received either naloxone (Nal; 1 mg/kg BW) or propranolol-a beta-adrenergic antagonist (Pro; 0.