Reevaluation of the role of progesterone in stimulating sexual receptivity in estrogen-treated gilts.
نویسنده
چکیده
Three studies were conducted to examine the role of progesterone in stimulating sexual receptivity in estrogen-treated, ovariectomized gilts. Progesterone was administered either before, simultaneously with, or 48 h after estrogen. In each study, gilts were treated with either a suboptimal or an optimal dosage of estradiol benzoate (EB). Progesterone treatment (600 micrograms/kg BW-1 X injection-1) on alternate days for a total of four injections produced serum concentrations of progesterone that were maximal at 9.4 ng/ml and remained greater than 1 ng/ml for 15 d. Estradiol benzoate was administered 22 d after the first of these progesterone injections. When progesterone was administered concurrently with or 48 h after EB, the dosage was 100 micrograms/kg BW and produced a maximal serum progesterone concentration of 1.8 ng/ml 4 h after treatment. Gilts were placed in an evaluation pen with a boar for 5 min on d 3 and 4 after EB treatment. Traits of interest were total number of mounts by the boar, mounts before the gilt showed the immobilization response, proportion of gilts that showed the immobilization response, and latency from entry of the gilt into the evaluation pen until the immobilization response. In none of the three studies did progesterone improve any of the traits of interest. In each study the immobilization response was observed in a higher proportion of gilts treated with the optimal than in those treated with the suboptimal dosage of EB. Latency from entry of gilts into the evaluation pen until the immobilization response was less on d 4 than on d 3 after EB in all studies.(ABSTRACT TRUNCATED AT 250 WORDS)
منابع مشابه
Effects of Estrogen and Progesterone on Different Immune Cells Related to Multiple Sclerosis
Multiple Sclerosis (MS) is a chronic autoimmune disease of young adults with an unknown etiology, but cellular immune responses and inflammation has a pivotal role in this regard. The higher incidence of MS among women indicates the possible involvement of female sex hormones on the disease course. Progesterone and estrogen are the most important sexual hormones in women. They exert different i...
متن کاملEffect of Withania somnifera (L.) Dunal on Sex Hormone and Gonadotropin Levels in Addicted Male Rats
Objective Opioid consumption has been widely increasing across the globe; however, it can cause adverse effects on the body. Morphine, an opioid, can reduce sex hormones and fertility. Withania somnifera (WS) is a traditional herb used to improve sexual activities. This study strives to investigate the effect of WS on sex hormones and gonadotropins in addicted male rats. MaterialsAndMethods In ...
متن کاملEstrogenic effects of zearalenone on the expression of progestin receptors and sexual behavior in female rats.
Zearalenone is a resorcylic acid lactone compound that is produced by fungal infection of edible grains and is believed to influence reproduction by binding to estrogen receptors. In order to study the potential estrogenic effects of this compound in the brain, we examined the effects of zearalenone on the expression of neuronal progestin receptors and feminine sexual behavior in female rats. O...
متن کاملEffects of cell phone radiation on estrogen and progesterone levels and ovarian changes in rats treated with garlic (Allium sativum L.) hydro-alcoholic extract
Background & Aim: Electromagnetic waves can damage sex organs and cause hormonal disorders, whereas garlic is known as reducing risk factors for various diseases. The aim of this study was to investigate the probable effects of mobile phone radiation and consumption of garlic on estrogen and progesterone levels and ovarian changes. Experimental: Five groups of rats (n = 8) were used which grou...
متن کاملEffects of cell phone radiation on estrogen and progesterone levels and ovarian changes in rats treated with garlic (Allium sativum L.) hydro-alcoholic extract
Background & Aim: Electromagnetic waves can damage sex organs and cause hormonal disorders, whereas garlic is known as reducing risk factors for various diseases. The aim of this study was to investigate the probable effects of mobile phone radiation and consumption of garlic on estrogen and progesterone levels and ovarian changes. Experimental: Five groups of rats (n = 8) were used which grou...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Journal of animal science
دوره 61 1 شماره
صفحات -
تاریخ انتشار 1985