BACKGROUND: Nowadays, infertility is one of the major problems of human societies. OBJECTIVES: To study oral administration of bulk milk and milk of late pregnant cows on spermatogenesis of male rats. METHODS: The first group of rats from day 1 of pregnancy until the end of lactation and then their male pups to maturity were treated with late pregnant cow’s milk. The second group from day 12 of pregnancy up to 15 days after delivery was treated with late pregnant cow’s milk. The third group of rats from day 1 of pregnancy until the end of lactation and then their male pups to maturity were treated with bulk milk. The fourth group from day 12 of pregnancy up to 15 days after delivery was treated with bulk milk. Rats in the control group during the study period were only fed with special food of rats and at the end viability, types of movement (progressive and in-place movement, immobility), number of sperms and also the serum testosterone level were elevated. RESULTS: Administration of both types of milk had no effect on in-place movement and also viability of sperms of experimental groups but they could cause a significant increase in sperm  immobility and a significant decrease in number of sperms of experimental groups. Also,the level of serum testosterone of experimental groups was significantly reduced in comparison with control group (p<0.05). CONCLUSIONS: Overall, it was determined consumption of late pregnant cow’s milk and bulk milk when it contains high estrogen can cause changes in some sperm species that are involved in male reproduction.

A substantial advance in our understanding on the estrogen signaling occurred in the last decade. Estrogens interact with two receptors, ESR1 and ESR2, also known as ERα and ERβ, respectively. ESR1 and ESR2 belong to the nuclear receptor family of transcription factors. 24 male mice divided into four groups as following : negative control, low dose group, intermediate dose group and high dose group, the groups of treatment were injected with estrogen at different doses while the negative control group were injected with normal saline (by method of intramuscular injection for all groups) and after 6 weeks all animals had been killed and the prostate was picked up and sectioned to reveal the histopathological changes. the study found that the injection of exogenous estrogen result in marked hyperplasia of the prostatic tissue and the hyperplasia increased significantly with elevation of the estrogen dose. In conclusion injection of exogenous estrogen lead to prostate hyperplasia through its action on the estrogen receptors which present in both stromal and epithelial component of the prostate

Estrogen and progesterone receptors (ER, PR) were measured in cytosol fractions from 18 primary canine mammary carcinomas by use of biochemical assays. One or both receptors were detected (> 10 fmol/mg of cytosol protein) in 11 tumors: 5 ER and PR; 2 ER only; 4 PR only. Mean cytoplasmic receptor concentrations (fmol/mg of cytosol protein) were 22.8 +/- 2.9 (SEM) for ER and 51.0 +/- 10.3 for PR in tumors containing ER and PR, 28.8 +/- 12.1 for ER in tumors containing only ER and 13.2 +/- 1.5 for PR in tumors containing only PR. Estrogen or progesterone receptors or both were identified in 6 of 9 tubular adenocarcinomas, 4 of 5 papillary adenocarcinomas, and 1 of 1 squamous cell carcinoma. These receptors were not identified in solid carcinomas (n = 2) or a single spindle cell carcinoma. Although the number of cases was limited, survival times of dogs tended to be longest in those with tumors containing ER alone or in combination with PR, intermediate in those with tumors containing only PR, and shortest in those with tumors without ER or PR. A correlation was not apparent between receptor status and age, presence of ovaries, tumor size, or histologic classification of the tumor. In the analysis of this series, the extent of surgery (mastectomy of the involved gland vs unilateral or bilateral mastectomy) did not appear to influence the outcome of the disease, and metastasis to regional lymph nodes did not appear to be a reliable prognostic indicator.

The current study aimed to evaluate the effects of [ 4&rsquo;,4&rdquo; -(4,5,6,7-tetrahydro- [1,2,3-] selenadiazolo[4,5e] pyridine-4,6-diyl) bis(benzene-1,3-diol)] (T) on female fertility and reproductive hormones, in addition histopathological examination of ovaries in comparison with the effects of Metamizole or Dipyrone (Di). Four groups of mature female rats each group consist of ten healthy female rats. Three groups received T and /or Di dissolved in drinking water 2mL (DW), the forth group received 2 mL of (DW) for 20 days before mating and ten days after mating. The results indicated that there was a significant increase in the number of births of (T) group (13.70&plusmn;3.34) compared to DW group (9.7&plusmn;1.06). Also, significant decline in T&amp;Di group to (6.91&plusmn;0.32), with no pregnancies reported in Di treated group. The pregnancy percentage was in T&amp;Di group basically decline to 40% compare with T and DW groups 100%. Follicle stimulating Hormone (FSH) level showed a significant elevation (p&lt;0.05) in T group (5.19mIU/mL &plusmn;0.72), and T&amp;Di (5.12 mIU/mL &plusmn;0.78) compared with DW (1.61mIU/mL&plusmn;0.52), and Di (1.46 mIU/mL &plusmn;0.60) groups. LH concentration of T (1.88 mIU/mL &plusmn;0.48), and T&amp;Di (1.67 mIU/mL &plusmn;0.41) groups LH values than in DW (1.75 mIU/mL &plusmn;0.67). Only in Di group (0.88 mIU/mL &plusmn;0.48) LH value reduced significantly (p&lt;0.05) than in other test groups. T group (17.22 mIU/mL &plusmn;4.50) progesterone level; also T&amp;Di group progesterone level (10.11 mIU/mL &plusmn;2.05) statistically important increase, while Di group there is essentially decreased (p&lt;0.05) to (2.69 mIU/mL&plusmn;0.89) compare to DW (6.31 mIU/mL &plusmn;1.41). Histopathological results showed that ovarian section of Di group disclosed large cystic corpus luteum CC.L, absence of Graafian Follicles and follicles at different stages of development. &nbsp;T group section showed normal Graafian follicles and different follicles in developmental stages, as well as there were several persistence corpus luteum. Ovary of T&amp;Di female rats relieves improvement of some Graafian follicles, Cystic corpus luteum (CC.L). Furthermore, there was some of clear C.L. It can be concluded that T compound had a Good effect on the level of reproductive hormones and increase fertility in female rats. While Di long term treatment had bad effects on female fertility, by affecting reproductive hormones levels and pathological change of ovaries.

This study was carried out in the animal house of the College of Veterinary Medicine /Basrah University to evaluate the effect of lignan extract of flax seed on haematological, biochemical parameters and histological examination in female rats, compared with conjugated estrogen drug. For this purpose, eighteen female rats weighed (180-200g) and aged (4-5 months) was divided into 3 equal groups (6 rats / group) for 14 days. First group: Drenched 1ml of normal saline (0.9% of NaCl)for 14 days. Second group: Drenched 0.10mg/kg B.W of conjugated estrogen dissolved in normal saline (0.9% of NaCl) for 14 days. Third group: Drenched 20mg/kg B.W of lignan extract of flaxseeds dissolved in normal saline (0.9% of NaCl)for 14 days. Blood samples were collected from heart by cardiac puncture from all experimental animals. These samples are used for the measurement of haematological and biochemical parameter as well as hormonal assy. Thyroid glands, liver, kidneys, ovaries and uterus were removed for histopathological study. The results revealed that, the female rats treated with lignan extract of flax seeds showed an increase in body weight. The result also showed that treated female rats with phytoestrogen had no significant effect on blood parameters except a significant effect on lymphocytes. (P≤ 0.05) in serum lipid profile except HDL compared to control. Moreover the results of biochemical parameters were indicated the affected in female rats treated with lignan extract that the revealed a significant(P≤ 0.05) decrease in serum lipid profile except HDL-Ch of female rats treated with lignan extract compared with the control group. Also the treatment with lignan extract caused significant (P≤ 0.05) increase in LH hormone, estradiol and progesterone compared with .While it has no significant effect on FSH. The treatment showed some ameliorative effect on histological structure of studied organs.

This study was planned to assess the effect of laparoscopic ovarioctomy in bitches on estrogen and progesterone hormones levels pre and post operation . The hormonal analysis was performed by Serum which was extracted from blood samples , the hormonal test include ( estrogen and progesterone ) , by using a device called Mini vidas system hormones assay with the kit of Bio merio of same company and then results were recorded , which include decrease in level of ( estrogen and progesterone ) post operation in two groups , but the level of depression in group B ( bilateral laparoscopic ovarioctomy ) more than group A ( unilateral laparoscopic ovarioctomy

Levator ani and coccygeus muscle estrogen and androgen receptors were measured in 6, healthy, greater than or equal to 5-year-old, noncastrated, male Beagles (controls) and in 24 dogs with perineal hernia. Estrogen and androgen receptor analyses were performed on levator ani and coccygeus muscle specimens obtained from control dogs at the time of castration; contralateral levator ani and coccygeus muscle specimens were assayed 2 months after castration. During herniorrhaphy of dogs with perineal hernia, levator ani (noncastrated, n = 12; castrated, n = 7) and/or coccygeus (noncastrated, n = 5; castrated, n = 4) muscle biopsy specimens were obtained for estrogen and androgen receptor analyses. For estrogen and androgen receptor assays, each muscle biopsy specimen was homogenized in Tris-EDTA-glycerol buffer, and centrifuged at 30,000 X g; extracts were used for binding with ligands: [3H]methyltrienolone (3H-R1881) for androgen receptors, and [3H]estradiol-17 beta for estrogen receptors. Extracts were incubated overnight at 0 to 4 C. Nonspecific binding was estimated, using 100-fold concentration of cold ligands. Bound and free hormones were separated, using hydroxylapatite batch assay. Receptor numbers for each tissue were calculated as femtomoles (fmol) per milligram of protein. Quantified data were compared between precastration and postcastration controls, using a paired t-test. One-way ANOVA and Bonferroni post-hoc test were used to compare values for precastration controls, postcastration controls, castrated dogs with perineal hernia, and noncastrated dogs with perineal hernia. Significance was set at P < 0.05. Estrogen receptors were not detected. Androgen receptors were characterized by Scatchard analysis (dissociation constant = 3.16 to 6.6 nM R1881, receptor number = 23 to 175 fmol/mg of protein). Post castration controls had significantly higher numbers of androgen receptors in levator ani and coccygeus muscles than did precastration controls. Dogs with perineal hernia (castrated and noncastrated) had lower numbers of androgen receptors than did either control group. The paucity of androgen receptors in pelvic diaphragm muscles of dogs with perineal hernia, compared with controls, suggests that decreases in quantity of androgen receptors contribute to the etiopathogenesis of perineal hernia in dogs.

Female Sprague-Dawley rats were treated IM with 0, 2.5, 25, and 50 micrograms of clenbuterol HCl/kg of body weight/d for 21 days. In all treated rats, significant increase in body weight gain (P < 0.05) and improvement in feed conversion ratio (P < 0.05) were recorded. Hydrometra was observed in the uterus of treated rats, and histologically, it was possible to see dilatation of luminal glands and ovarian alterations. Clenbuterol treatment induced significant (P < 0.05) increase in uterine estrogen receptor concentration of rats treated with the 2 higher doses. Treatment apparently failed to enhance the rate of oxidative and conjugative biotransformations, except for glucuronidation of p-nitrophenol (P < 0.05). On the basis of the data obtained, we could affirm that high doses of clenbuterol affect the female reproductive system of rats inducing, almost in part, estrogen-like modifications, but probably by a different mechanism of action correlated to intense adrenergic stimulation.

Estrogen receptors were measured in normal canine lymph nodes and neoplastic tissue from dogs with lymphoma, using a commercially available [3H]estradiol dextran-coated charcoal assay. Using the same assay, estrogen receptors were detected in the positive-control tissues--dog uterus, rat uterus, and lyophilized bovine uterus. Specific binding of [3H]estradiol was not detected in rat skeletal muscle or in any of the canine lymphoid tissues, indicating that the specimens did not contain estrogen receptors.

Ten tumors from 7 dogs were analyzed for estrogen receptors. Of 9 determined to be mast cell tumors, 6 were determined not to have estrogen receptors (less than 3 fmol of estradiol/mg of cytosol protein) and 3 were questionable (3 to 10 fmol of estradiol/mg). One tumor was a mixed mammary tumor and was determined to have estrogen receptors (12 fmol of estradiol/mg). Histologic grading of the mast cell tumors did not suggest a correlation with estrogen receptor values.