Females in estrus showed maximum olfactory sensitivity as judged by their ability in locating the buried bait. The results suggest that olfactory sensitivity in females varies during the stages of the estrous cycle. The findings further indicate that gonadal steroids play an important role in the expression of olfactory sensitivity in females.

The mechanisms by which OB protein controls food intake and energy balance are unknown. Therefore, we investigated the effects of a novel modified human recombinant OB protein (Mod-OB) on spontaneous feeding patterns, body weight, running wheel activity, and ovarian cycling in female rats. Mod-OB or vehicle was injected (4 mg ⋅ kg-1 ⋅ day-1sc) for 2 ovarian cycles (8 days) using a within-subjec...

The effect of bull exposure on the resumption of estrous activity following parturition was studied in an experiment using mature Hereford and Hereford X Angus beef cows. In the spring of 1981 and 1982, cows were assigned by breed and calving date to one of two treatment groups. Cows were exposed to bulls either from 3 to 85 d postpartum (BE; n = 45, 1981; n = 35, 1982) or from 53 to 85 d postp...

A study was conducted to assess the effect of multiple stresses (thermal, nutritional, and walking stress) on the reproductive performance of Malpura ewes. The study was conducted for a period of 35 days covering two estrous cycles during summer season (April-May). The ewes were randomly allocated into two groups of twelve animals each namely, GI (n=12; Control), and GII (n=1 2; Multiple stress...

Kiel J, Leranth C (2006) Synaptic remodeling induced by gonadal hormones: neuronal plasticity as a mediator of neuroendocrine and behavioral responses to (2007) Fluctuation of synapse density in the arcuate nucleus during the estrus cycle. Estradiol-induced synaptic remodeling of tyrosine hydroxylase immunopositive neurons in the rat arcuate nucleus. Endocrinology. 2008 Apr 17. Epub ahead of pr...

Two experiments were conducted to determine whether extending the interval between removal of melengestrol acetate (MGA) from feed and injection of prostaglandin F2α (PGF) from 17 to 19 d would affect synchronization of estrus, conception, and pregnancy rates of beef heifers. In both experiments, heifers were fed MGA for 14 d, and PGF was given at either 17 or 19 d after cessation of MGA feedin...

While the normal estrous cycle of adequately acclimated female rats was replaced by a persistent estrus (PE) under continuous lighting, the onset of PE was delayed following several irregular cycles without acclimation or after acclimation for one week, suggesting that transportation induces a significant critical stress.

A primary characteristic of autism, which is a neurodevelopmental disorder, is impaired social interaction and communication. Furthermore, patients with autism frequently show abnormal social recognition. In mouse models of autism, social recognition is usually assessed by examining same-sex social behavior using various tests, such as the three-chamber test. However, no studies have examined t...

The Nature of the Problem Heat stress has two major actions on physiology of the female that reduce the probability of a cow becoming pregnant. First, heat stress reduces ability to detect estrus. On one dairy in Florida, only about 18-24% of estruses in hot months were detected by herdsmen while 45-56% of estrus periods were detected in cool months (Thatcher and Collier, 1986). The reduction i...