نتایج جستجو برای: gonadotropin hormones

تعداد نتایج: 87002  

Journal: :Reproduction, nutrition, development 2002
Wilhelm Kanitz Frank Becker Falk Schneider Ellen Kanitz Claus Leiding Hans-Peter Nohner Ralf Pöhland

Embryo transfer (ET) in cattle has been used for the realisation of breeding programmes world-wide for more than 20 years. The efficiency of breeding technology, i.e. the breeding progress and costs, depends to a large extent on the results of superovulatory treatment and artificial insemination (A.I.). The results of this step are characterised by a high degree of variation. Numerous attempts ...

Journal: :European journal of endocrinology 1998
I T Huhtaniemi K Aittomäki

The physiological functions of the two gonadotropins, follicle-stimulating hormone (FSH) and luteinizing hormone (LH), are quite well known in both males and females. Nevertheless, the recent unraveling of structures of the gonadotropin and gonadotropin receptor genes has provided us with tools to obtain completely new information on the functions of these hormones at the molecular level. Sever...

Journal: :Bioscience reports 1988
M R Sairam J Linggen G N Bhargavi

Radioimmunological techniques were utilized to probe possible changes in conformation of gonadotropins (human chorionic gonadotropin--hCG; and ovine luteinizing hormone--oLH) following chemical deglycosylation (DG-hCG and DG-LH). All antisera produced in rabbits, rats or mice contained antibodies that were specific to the deglycosylated hormones with the native hormones showing weak and non-par...

Journal: :ScienceRise 2022

The study examined the effect of some antiepileptic medications and disease itself on hormonal background young men.
 aim was to examine drugs Methods: This involved 80 male patients aged 18-44 years. All were divided into 4 groups depending monotherapy received: carbamazepine (CBZ), valproic acid (VA), levetiracetam (LEV) oxcarbazepine (OXC). Twenty healthy males years (31.30 ± 4.07), who...

2007
Eugene McDermott

Several aspects of the functional development of the testis and ovary have been characterized in the fetal rabbit. First, the capacity of the fetal ovary to form 17p-estradiol develops at the same time in embryogenesis as the onset of testosterone formation in the fetal testis. Second, both fetal ovaries and testes have the capacity to form these steroid hormones from cholesterol de novo. Third...

Journal: :Endokrynologia Polska 2008
Robert Krysiak Bogdan Marek Bogusław Okopień

Central precocious puberty, defined as the onset of puberty before the age 8 years in girls and 9 years in boys, results from a premature activation of gonadotropin-releasing hormone neurons in the hypothalamus. This condition is characterised by early pubertal changes, acceleration of growth velocity, and rapid bone maturation that often result in reduced adult height. It may be either idiopat...

Journal: :General and comparative endocrinology 2013
Travis E Wilcoxen Eli S Bridge Raoul K Boughton Thomas P Hahn Stephan J Schoech

In most vertebrates, production of reproductive hormones wanes with age, co-occurring with a decline in reproductive output. Measurement of these hormones can serve as a key marker of the onset of reproductive senescence. Longitudinal studies of physiological parameters in populations of free-living animals are relatively uncommon; however, we have monitored baseline concentrations of hormones ...

2003
S. E. Echternkamp

The interval from onset of estrus to preovulatory luteinizing hormone (LH) release, conception and fertilization rates, and number of accessory spermatozoa per ovum at 48 hr postmating in untreated cyclic ewes and fn progestogen-pregnant mare serum gonadotropin (PMSG) treated, anestrous ewes were compared in efforts to identify sources of lowered fertility for matings induced in anestrous ewes ...

2013
Gad Degani Gal Levy

This study examined the effect of underground water on reproductionand growth-related hormones in blue gourami males under non-reproductive and reproductive conditions. An increase in the percentage of males building nests under the highest percentage of underground water were compared to fish that maintained a lower percentage of underground water in the first two days. The % Gonado-somatic in...

Journal: :The Journal of endocrinology 2015
Kushaan Dumasia Anita Kumar Leena Kadam N H Balasinor

Maintenance of normal male fertility relies on the process of spermatogenesis which is under complex endocrine control by mechanisms involving gonadotropin and steroid hormones. Although testosterone is the primary sex steroid in males, estrogen is locally produced in the testis and plays a very crucial role in male fertility. This is evident from presence of both the estrogen receptors alpha (...

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