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bp0005rdr20 | Neuroendocrine Interactions | REDR2002

Stress and the control of LH secretion in the ewe

Smith RF , Ghuman SPS , Evans NP , Karsch FJ , Dobson H

Stress influences the activity of the reproductive system at several sites. One of the most significant effects is at level of the GnRH secretory system to reduce GnRH pulsatility and thus LH pulsatility. This in turn reduces the oestradiol signal that stimulates the GnRHLH surge in the follicular phase. Three sequential phases have been identified in the induction of the GnRHLH surge by oestradiol: (i) activation, (ii) transmission and (iii) surge secretion. There...

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bp0005rdr23 | Neuroendocrine Interactions | REDR2002

Origin of cerebrospinal fluid melatonin and possible function in the integration of photoperiod

Tricoire H , Møller M , Chemineau P , Malpaux B

Melatonin, which is synthesized at night by the pineal gland, is present in the cerebrospinal fluid (CSF), but its entry site and its role in this compartment are not known. Using several approaches, we tested the hypothesis that melatonin enters the CSF through the pineal recess, an evagination of the third ventricle. CSF melatonin concentrations are higher near the pineal gland than in the anterior part of the third ventricle, and decrease markedly (80%) after sealing of...

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bp0013cpr2 | The Hypothalamic-Pituitary-Ovarian Axis | CPR1989

Regulation and action of gonadotrophinsin pigs

Esbenshade K. L. , Ziecikt A. J. , Britt J. H.

Summary. Gonadotrophins, synthesized and secreted from the basophils of the adenohypophysis, bind to various target cells and elicit a wide variety of responses. Specific receptors for gonadotrophins have been found on plasma membranes of thecal, granulosa, luteal, endometrial and myometrial cells in the female and on Leydig and Sertoli cells in the Male. Gonadotrophins exert their effects through various intracellular second messengers and control biosyn...

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bp0015cpr2 | Regulation of Reproductive Function | CPR1997

Immune-endocrine interactions affecting luteal function in pigs

Wuttke W. , Pitzel L. , Knoke L. , Theiling K. , Jarry H.

The formation, normal function and destruction of corpora lutea are essential features of normal reproduction. Although the formation of corpora lutea from follicles is largely dependent on pituitary gonadotrophins, the process of luteolysis is locally regulated and poorly understood. The corpus luteum consists of several steroidogenic and nonsteroidogenic cell types that interact with each other in a paracrine manner. Under cell culture conditions, large luteal cells tha...

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bp0019cpr19 | Gestation Elicited | CPR2013

Next Generation Sequencing for microRNA profiling in the porcine endometrium

Krawczynski K , Bauersachs S , Blum H , Kaczmarek MM

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bp0019cpr23 | Managing for Litter Survival | CPR2013

Importance of pre-mating nutritional and metabolic conditions for litter uniformity

Wientjes J.G.M. , Soede N.M. , van den Brand H. , Kemp B.

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bp0006rdr14 | Reproductive Manangement | REDR2006

Technologies for fixed-time artificial insemination and their influence on reproductive performance of Bos indicus cattle

Bó GA , Cutaia L , Peres LC , Pindnato D , Maraña D , Baruselli PS

The adaptation of Bos indicus cattle to tropical and subtropical environments has led to their widespread distribution around the world. Although artificial insemination (AI) is one of the best alternatives to introduce new genetics into Bos indicus herds, the peculiarity of their temperament and the tendency to show short oestrus (many of them during the night) greatly affects the effectiveness of genetic improvement programs. Therefore, the most useful alte...

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bp0016cpr20 | New Technologies | CPR2001

Applying functional genomics research to the study of pig reproduction

Pomp D. , Caetano A. R. , Bertani A. R. , Gladney C. D. , Johnson R. K.

Functional genomics is an experimental approach that incorporates genomewide or system-wide experimentation, expanding the scope of biological investigation from studying single genes to studying potentially all genes at once in a systematic manner. This technology is highly appealing because of its high throughput and relatively low cost. Furthermore, analysis of gene expression using microarrays is likely to be more biologically relevant than the conventional paradigm ...

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bp0018cpr24 | Breaking Science in Pig Reproductive Biology | CPR2009