scholarly journals Avian Reproduction

2021 ◽  
Author(s):  
Kingsley Omogiade Idahor
Keyword(s):  
Sex Hormones ◽  
Reproductive System ◽  
Avian Species ◽  
Secretory Product ◽  
Avian Reproduction ◽  
Sexual Characteristics ◽  
Characteristics Development ◽  
Shape And Size ◽  
Single Ovary

There are about 10,400 living avian species belonging to the class Aves, characterized by feathers which no other animal classes possess and are warm-blooded vertebrates with four-chamber heart. They have excellent vision, and their forelimbs are modified into wings for flight or swimming, though not all can fly or swim. They lay hard-shelled eggs which are a secretory product of the reproductive system that vary greatly in colour, shape and size, and the bigger the bird, the bigger the egg. Since domestication, avian species have been basically reared for eggs, meat, pleasure and research. They reproduce sexually with the spermatozoa being homogametic and carry Z-bearing chromosomes, and the blastodisk carries either Z-bearing or W-bearing chromosomes, hence, the female is heterogametic, and thus, determines the sex of the offspring. The paired testes produce spermatozoa, sex hormones and the single ovary (with a few exceptions) produces yolk bearing the blastodisk and sex hormones. Both testis and ovary are the primary sex organs involved in sexual characteristics development in avian. In avian reproduction, there must be mating for fertile egg that must be incubated to produce the young ones. At hatch, hatchling sex is identified and reared to meet the aim of the farmer.

scholarly journals Obesity and Hypogonadism—A Narrative Review Highlighting the Need for High-Quality Data in Adolescents

Children ◽  
2019 ◽  
Vol 6 (5) ◽  
pp. 63 ◽  
Author(s):  
Tasnim Mushannen ◽  
Priscilla Cortez ◽  
Fatima Cody Stanford ◽  
Vibha Singhal
Keyword(s):  
Reproductive System ◽  
Disease Risk ◽  
Current Knowledge ◽  
Clomiphene Citrate ◽  
Cardiovascular Disease Risk ◽  
Quality Data ◽  
Male Hypogonadism ◽  
Hpg Axis ◽  
Organ Systems ◽  
Sexual Characteristics

The prevalence of obesity continues to rise in adult and pediatric populations throughout the world. Obesity has a direct impact on all organ systems, including the reproductive system. This review summarizes current knowledge about the effects of obesity on the male reproductive system across age, highlighting the need for more data in children and adolescents. Male hypogonadism is commonly seen in patients with obesity and affects the onset, duration, and progression of puberty. Different pathophysiologic mechanisms include increased peripheral conversion of testosterone to estrone and increased inflammation due to increased fat, both of which lead to suppression of the hypothalamic-pituitary-gonadotropin (HPG) axis and delayed development of secondary sexual characteristics in adolescent males. Evaluation of the HPG axis in obesity includes a thorough history to exclude other causes of hypogonadism and syndromic associations. Evaluation should also include investigating the complications of low testosterone, including increased visceral fat, decreased bone density, cardiovascular disease risk, and impaired mood and cognition, among others. The mainstay of treatment is weight reduction, but medications such as testosterone and clomiphene citrate used in adults, remain scarcely used in adolescents. Male hypogonadism associated with obesity is common and providers who care for adolescents and young adults with obesity should be aware of its impact and management.

Sex hormones in Strombus pugilis (Mollusca: Gastropoda) in different gonadal stages

2020 ◽  
Vol 96 (4) ◽  
pp. 679-694
Author(s):  
Fabiola Chong Sánchez ◽  
Martha Enríquez Díaz ◽  
Dalila Aldana Aranda
Keyword(s):  
Sex Hormones ◽  
Histological Section ◽  
Reproductive Activity ◽  
Gonadal Development ◽  
Mature Stage ◽  
Histological Techniques ◽  
Sexual Characteristics ◽  
17Β Estradiol ◽  
Three Stages ◽  
Section Analysis

Sex hormones play an essential role in sexual differentiation, maintenance of sexual characteristics, gamete maturation, and mating behavior. However, very little is known about their dynamics in molluscs. We conducted a study on sex hormone (17β-estradiol, testosterone, and progesterone) concentrations in male and female Strombus pugilis to identify their variations at different gonadal stages. A total of 90 organisms (30 per month) were collected in February, September, and November 2016. The gonadal digestive gland complex of each specimen was dissected and divided into two sections. One section was set in alcoholic Bouin's fluid and processed with classic histological techniques; the second was macerated with 80% ethanol to extract steroids and analyzed by enzyme immunoassays. Histological section analysis was used to classify gonadal development into three stages: gametogenesis, mature, and undifferentiated. Mature females were observed in September. Testosterone and 17β-estradiol concentrations in both sexes were highest in the mature stage. In S. pugilis, 17β-estradiol, progesterone, and testosterone were all present, with higher concentrations associated with reproductive activity.

scholarly journals Vitamin D as a regulator of steroidogenic enzymes

F1000Research ◽  
2014 ◽  
Vol 3 ◽  
pp. 155 ◽  
Author(s):  
Johan Lundqvist
Keyword(s):  
Vitamin D ◽  
Steroid Hormones ◽  
Sex Hormones ◽  
Active Form ◽  
Animal Experiments ◽  
Physiological Role ◽  
Steroidogenic Enzymes ◽  
Adrenal Steroid ◽  
Wide Range ◽  
Sexual Characteristics

During the last decades, the outlook on vitamin D has widened, from being a vitamin solely involved in bone metabolism and calcium homeostasis, to being a multifunctional hormone known to affect a broad range of physiological processes. The aim of this review is to summarize the research on vitamin D as a regulator of steroidogenic enzymes. Steroid hormones exert a wide range of physiological responses, including functions in the immune system, protein and carbohydrate metabolism, water and salt balance, reproductive system and development of sexual characteristics. The balance of sex hormones is also of importance in the context of breast and prostate cancer. Steroid hormones are synthesized in steroidogenic tissues such as the adrenal cortex, breast, ovaries, prostate and testis, either from cholesterol or from steroidogenic precursors secreted from other steroidogenic tissues. The hormonally active form of vitamin D has been reported to act as a regulator of a number of enzymes involved in the regulation of steroid hormon production, and thereby the production of both adrenal steroid hormones and sex hormones. The research reviewed in the article has in large part been performed in cell culture based experiments and laboratory animal experiments, and the physiological role of the vitamin D mediated regulation of steroidogenic enzyme need to be further investigated.

scholarly journals Hypophysectomy of birds. I-Technique, with a note a on results

1934 ◽  
Vol 115 (794) ◽  
pp. 402-409 ◽  
Keyword(s):  
Sex Hormones ◽  
Soft Palate ◽  
Reproductive System ◽  
Easy Access ◽  
Wide Field ◽  
Small Incision ◽  
Floor Of The Mouth ◽  
Secondary Sexual Characters ◽  
Large Size ◽  
Base Of The Skull

Hypophysectomy is now performed readily in many mammals and amphibians, but so far it has apparently not been successfully accomplished in birds. Fischera (1905) attempted to cauterize the pituitary body of the fowl, but obtained only dubious results. In view of our increasing knowledge of the reproductive system and secondary sexual characters of birds, it is evident that hypophysectomy would open up a wide field of investigation for work on sex hormones. The parapharyngeal route for removing the pituitary was precluded by the large size of the gullet, while the temporal route seemed to offer little hope. The extensibility of the mouth tissues, however, suggested that a buccal approach would be practicable. It was found barely possible to open the beak sufficiently to give easy access to the back of the mouth, but a comparatively small incision in the thin elastic floor of the mouth provided a ready approach to the soft palate and the base of the skull. We have found it possible to remove the pituitary with comparative ease by this transbuccal route, and the present paper is devoted to a description of the exact technique of the operation. The following description applies primarily to the fowl; notes on the differences found in other birds are given in Section III.

scholarly journals Sex Hormones and Immune Dimorphism

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Aruna Bhatia ◽  
Harmandeep Kaur Sekhon ◽  
Gurpreet Kaur
Keyword(s):  
Immune System ◽  
Sex Hormones ◽  
Immune Cells ◽  
Reproductive System ◽  
Hormone Receptors ◽  
Review Article ◽  
The Body ◽  
Pathological Conditions ◽  
Different Types ◽  
Major Factors

The functioning of the immune system of the body is regulated by many factors. The abnormal regulation of the immune system may result in some pathological conditions. Sex hormones of reproductive system are one of the major factors that regulate immune system due to the presence of hormone receptors on immune cells. The interaction of sex hormones and immune cells through the receptors on these cells effect the release of cytokines which determines the proliferation, differentiation, and maturation of different types of immunocytes and as a result the outcome of inflammatory or autoimmune diseases. The different regulations of sex hormones in both sexes result in immune dimorphism. In this review article the mechanism of regulation of immune system in different sexes and its impact are discussed.

scholarly journals Insights into the perspective correlation between vitamin D and regulation of hormones: sex hormones and prolactin

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohannad E. Qazzaz ◽  
Mohammed N. Abed ◽  
Fawaz A. Alassaf ◽  
Mahmood H. M. Jasim ◽  
Mohanad Alfahad
Keyword(s):  
Vitamin D ◽  
Sex Hormones ◽  
Reproductive System ◽  
Semen Quality ◽  
Endocrine System ◽  
Reproductive Organs ◽  
The Road ◽  
Female Sex Hormones ◽  
Males And Females ◽  
Indirect Relationship

Abstract Aim. Vitamin D is currently an exciting research target, besides its obvious role in calcium homeostasis and bone health, enormous work is being directed at examining the effects of this vitamin on various biological functions and pathological conditions. Material and methods. The review of the literature and the analysis took about six months and was carried out through PubMed. This is a search engine opening mainly the MEDLINE database of trusted references. We called up all studies written in English that were published between the years 2004 to 2021 and that came through using the applied search terms, and analysed all those that met the criteria. Results. The endocrine system with its many glands and hormones and their essential roles in the maintenance of normal body functioning cannot be far from interactions with vitamin D. Male and female sex hormones are no exceptions and many studies have investigated the correlations between these hormones and vitamin D. As such, direct and indirect relationships have been found between vitamin D, its receptors or one of its metabolising enzymes with sex hormones and the development of reproductive organs in males and females. Conclusion. This review summarises the research investigating the associations of vitamin D with sex hormones and reproductive organs in males and females, and thus may pave the road for future studies that will investigate the clinical significance of vitamin D in the management of reproductive system disorders. Despite some conflicting results about the relationship between VD and the effectiveness of the reproductive system, many studies confirm the presence of receptors for this vitamin in the reproductive system, and this supports the direct or indirect relationship between VD and prolactin or VD and testosterone through PO4 and Ca2+ homeostasis, or production of osteocalcin. Therefore, VD is positively associated with semen quality and androgen status. Furthermore, a direct relationship between VD and the production of progesterone, estrogen and estrone in human ovarian cells has been supported by many studies.

scholarly journals HORMONE-ASSOCIATED METABOLIC DISORDERS OF THE ORAL CAVITY ORGANS IN WOMEN OF REPRODUCTIVE AGE

2021 ◽  
Vol 78 (4) ◽  
pp. 127-134
Author(s):  
George Khodorovskyi ◽  
Lyubov Panina ◽  
Tetiana Shchurko
Keyword(s):  
Epithelial Cells ◽  
Oral Cavity ◽  
Steroid Hormones ◽  
Tight Junctions ◽  
Sex Hormones ◽  
Reproductive System ◽  
Periodontal Ligament ◽  
Sex Steroid Hormones ◽  
Sex Steroid ◽  
Periodontal Tissues

There is emerging evidence of a possible relationship between the oral cavity and reproductive organs. Recent studies suggest these functional relations. The aim of this review was to synthesize the available evidence on this relationship. Clinical observation established that sex hormones enhance gingival inflammation in periodontal healthy women during pregnancy and that periodontal condition is associated with variation of sex hormones in blood. Estrogen regulates DNA synthesis in human gingival epithelial cells and periodontal ligament, estrogen reduces down regulation of cytokines. Estrogen and progesterone affect the periodontium via appropriate receptors (estrogen receptor and progesterone receptor). They are localized in human periodontium, demonstrating that periodontal tissues are the target tissues for these hormones. Testosterone receptors are found in the periodontal tissues. It inhibits prostaglandin secretion and reduces interleukin production. At the same time testosterone stimulates osteoblast proliferation and differentiation, also enhances matrix synthesis by fibroblast, osteoblasts, and periodontal ligament. The role of testosterone in the formation of teeth is demonstrated in the paper. In females and males, in saliva there are sex steroid hormones. The study examined the entry mode of hormones into saliva. The results suggest that lipid soluble unconjugated steroids (estriol, testosterone, progesterone) enter saliva via intracellular route; the conjugated steroids (lipid insoluble (dehydroepiandrosterone, conjugated estrogens)) enter via the ‘tight junctions’ (infiltrations through the tight junctions between the acinar cells). Recent evidence indicates that organs of the oral cavity (salivary glands, periodontal tissues, oral epithelial cells mucus) produce ghrelin-hormone which affects organs of the reproductive system directly or indirectly via hypothalamic-pituitary-gonadal axis. In all these organs, there is an appropriate receptor. In conclusion, the organs of oral cavity and organs of reproductive system are functionally linked by sex steroid hormones and ghrelin, besides that periodont can influence ovaries by neuro-reflectory link.  

scholarly journals Effects of Sub Lethal Concentrations of Sodium Fluoride on Sperm Activity and on the level of Sex Hormones of Adult Male Albino Rats

2020 ◽  
Vol 44 (2) ◽  
pp. 92-98
Author(s):  
Hadeel B. Al-Sabaawy ◽  
Bushra I. Al-Kaisie
Keyword(s):  
Sex Hormones ◽  
Sodium Fluoride ◽  
Reproductive System ◽  
Sperm Concentration ◽  
Male Reproductive System ◽  
Male Rats ◽  
Control Group ◽  
Sperm Velocity ◽  
Sexual Hormones ◽  
Sperm Motion

In recent years, fluorosis caused many problems in humans and animals bodies. Dental fluorosis, skeletal fluorosis, bone fractures, decreased birth rates, adverse effects on the male genital system, like damaging the structure of testes and epididymis and loosing fertilization ability can be considered as good examples of fluorosis. Thus, the current study aimed to determine the toxicity of sodium fluoride (NaF) on the activity of sperm and the level of sex hormones including testosterone, follicle stimulating hormone, and luteinizing hormone. For achieving this purpose, thirty adult albino male rats, aged between 90-100 days, were divided randomly into two treated groups with 10 rats for each group which were treated with 150, 300 ppm of sodium fluoride,respectively. In addition, 10 rats were kept as a control group. Sodium fluoride was offered to the treated groups in the drinking water to evaluate the toxic effect of NaF on male reproductive system, sperm concentration, sperm motion, and sperm velocity compared with control group. The findings revealed a significant decrease in the sperm concentration, sperm count, sperm motion, sperm velocity and the level of sexual hormones in comparison with the control group. It can be concluded that NaF may reduce the efficiency of male reproductive system, and reduce the levels of sexual hormones in rats

scholarly journals Influence of Fetoplacentary Insufficiency of Mothers on the State of Spermatogenesis of Male Offspring

2020 ◽  
Vol 5 (5) ◽  
pp. 343-348
Author(s):  
N. Yu. Seliukova ◽  
◽  
K. V. Misyura ◽  
D. V. Morozenko ◽  
R. V. Dotsenko ◽  
...  
Keyword(s):  
Sex Hormones ◽  
Adult Male ◽  
Reproductive System ◽  
The State ◽  
Male Offspring ◽  
Reproductive Age ◽  
Toxic Substances ◽  
Long Term Effects ◽  
Testosterone Levels

The demographic situation in most countries of the European region, which includes Ukraine, is characterized as quite complex. Nowadays the question of the long-term effects of maternal fetoplacental insufficiency on the functioning of human body systems, in particular on the reproductive system of male offspring, remains open. It is known that negative factors during pregnancy can affect the development and existence of the individual. The purpose of the work was to study the long-term effects of fetoplacental insufficiency on the functioning of the reproductive system of adult male offspring born by mothers of different ages. Material and methods. The study was performed on healthy adult female Wistar rats, young (3 months) and mature (10 months) of reproductive age. 4 groups were formed: the 1st and the 2nd groups included intact animals of young and mature age; the 3rd and the 4th had females with experimental fetoplacental insufficiency of young and mature reproductive age. Modeling of fetoplacental insufficiency was performed by daily subcutaneous injection to females from the 12th to the 18th day of pregnancy 50% oil solution of carbon tetrachloride at a dose of 2 ml/kg body weight. We studied the state of spermatogenesis, weight of internal organs, sex hormones in mature male offspring of 3 months of age after decapitation. Results and discussion. Fetoplacental insufficiency leads to lower testosterone levels in all offspring born to mothers of different reproductive ages. The total level of estradiol remained almost unchanged, but still, in animals there was a shift in the ratio of sex hormones in the direction of hyperestrogenism. Experimental fetoplacental insufficiency in females of different reproductive ages also affected the mass of the testes, epididymis and adrenal glands in their male offspring. According to the indicators of the functional state of epididymal sperm in animals born by reproductively young females, the share of pathological forms of sperm decreased by 45%, in the offspring born by reproductively mature females with fetoplacental insufficiency decreased the number of motile sperm by 46% compared to the intact group of animals. Conclusion. The penetration of toxic substances into the mother's body leads to varying degrees of total xenobiotic load, followed by induction of neutralization reactions and the development of metabolic forms of fetoplacental insufficiency, changing the function of the endocrine system and causing adverse effects on the reproductive system. Fetoplacental insufficiency affects the reproductive function of adult male offspring born to mothers of different reproductive ages, which is manifested in a decrease in testosterone levels and deterioration of the spermogram, which in turn can lead to problems with impregnation

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