T he estrus cycle of rats and hamsters is regulated by the daily light-dar k cycle . The suprachiasmatic nucleus of the hypothalamus appears t o generate a rhythm with a frequency of approximately one cycle in 24 hours . This rhythm is exactly synchronized with the external light-dark cycle b y impulses received from the eyes through a retinohypothalamic projection . Lesions that destroy the su...

Jugular blood was collected at 6-hr intervals during estrus and at daily intervals during diestrus from 12 cycling mares. On day 8 of diestrus four mares were given saline (im) while the remaining eight mares were given Equimate (250 //g), a synthetic analog (ICI-81008) of PGF2c~. Following treatment, jugular blood was collected at 15-min intervals for 6 hr and "then at 6-hr intervals until the...

Successful reproductive management in buffaloes depends on effective estrus detection. Urinary pheromones identified from natural estrous cycle have been reported to decipher estrus phase. However, its presence has not been analyzed in the urine after synchronization. Thus, our present investigation was to investigate the influence of synchronized estrus urine in bulls and to examine the presen...

This study determined whether the interval from estrus to ovulation was altered by giving P.G. 600 to sows at weaning. Mixed-parity sows received P.G. 600 i.m. (n = 72) or no treatment (n = 65) at weaning (d 0). Beginning on d 0, sows were observed for estrus twice daily. At the onset of estrus and thereafter, ultrasound was performed twice daily to determine the average size of the largest fol...

Cows exhibiting estrus near fixed-time artificial insemination (AI) had greater pregnancy success than cows not showing estrus. The objective of this study was to determine the relationship between follicle size and peak estradiol concentration between cows that did or did not exhibit estrus during a fixed-time AI protocol. Ovulation was synchronized in beef cows by applying the CO-Synch protoc...

Background: The increase of calorie intake can the risk obesity and diabetes mellitus. One efforts to reduce is doing physical exercise. Types exercise that affect system female reproduction are not clearly defined. Purpose: To analyse effect moderate intensity continuous on FSH levels in rats exposed a high-calorie diet. Methods: Laboratory experimental was research with Randomized Post test o...

Reproductive performance in cows following synchronization of estrus with intravaginal progesterone releasing devices (IVD) has varied with the length of treatment, cyclic status and prolonged return to estrus intervals in some cows following first AI. The objective of this study was to compare two methods of synchronizing and resynchronizing estrus on the reproductive performance of lactating ...

Irritable bowel syndrome (IBS) is often seen in women, and symptom severity is known to vary over the menstrual cycle. In addition, activation of the hypothalamic-pituitary-adrenal (HPA) axis enhances symptomology and patients with IBS have increased activation of the amygdala, a brain region known to facilitate HPA output. However, little is known about the effects of amygdala activation durin...