References of "Hanzen, Christian"
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See detailApplications pratiques des prostaglandines F2alpha en reproduction bovine : le vrai et le faux
Hanzen, Christian ULg

Conference given outside the academic context (1999)

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See detailPhysiopathologie et performances de reproduction : une approche terminologique
Hanzen, Christian ULg; Badinand, François; Bedouet, J. et al

Conference (1999, January)

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See detailLes conditions de la rentabilité de la production d'embryons bovins par ponction folliculaire échoguidée et fécondation in vitro en Région Wallonne : première approche.
Dehareng, D.; Annet, C.; Dupont, F. et al

in Annales de Médecine Vétérinaire (1999), 143

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See detailProfil de l'état corporel au cours du post partum chez la vache laitière
Drame, Daour; Hanzen, Christian ULg; Houtain, J. Y. et al

in Annales de Médecine Vétérinaire (1999), 143

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See detailLa mortalité embryonnaire. 2. Implications hormonales
Hanzen, Christian ULg; Lourtie, O.; Drion, Pierre ULg et al

in Annales de Médecine Vétérinaire (1999), 143

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See detailLa mortalité embryonnaire. 1. Aspects cliniques et facteurs étiologiques dans l'espèce bovine
Hanzen, Christian ULg; Drion, Pierre ULg; Lourtie, O. et al

in Annales de Médecine Vétérinaire (1999), 143

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See detailLa césarienne dans l'espèce bovine
Hanzen, Christian ULg; Lourtie, O; Ectors, Francis

in Annales de Médecine Vétérinaire (1999), 143

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See detailConditions pratiques et thérapeutiques de la césarienne dans l'espèce bovine : résultats d'une enquête franco-belge.
Hanzen, Christian ULg; Houtain, Jean Yves

in Navetat, Henri; Schelcher, François (Eds.) Le nouveau peripartum (1998, November 28)

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See detailTumeur de la granulosa chez la jument. Description d'un cas clinique et revue bibliographique.
De Behr, Vanessa; Saunders, Jimmy; Cassart, Dominique ULg et al

in Annales de Médecine Vétérinaire (1998), 142

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See detailApplication de l'échographie à la ponction ovarienne
Hanzen, Christian ULg; Goffin, L.

in Annales de Médecine Vétérinaire (1998), 142

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See detailEvaluation of false ultrasonographic pregnancy diagnoses in cows by measuring plasma levels of bovine pregnancy-associated glycoprotein 1 (bPAG1).
Szenci, Otto; Taverne, M. A. M.; Beckers, Jean-François ULg et al

in Veterinary Record : Journal of the British Veterinary Association (1998), 142(2), 304-306

Between days 27 and 59 after artificial insemination (AI),189 ultrasonographic pregnancy diagnoses were made in 56 dairy cows using a 7·5 MHz linear-array rectal transducer. Blood samples were withdrawn ... [more ▼]

Between days 27 and 59 after artificial insemination (AI),189 ultrasonographic pregnancy diagnoses were made in 56 dairy cows using a 7·5 MHz linear-array rectal transducer. Blood samples were withdrawn from a jugular vein on the day of AI, on day 21, and after each ultrasonographic examination between days 27 and 31, days 34 and 38, days 41 and 45 and days 55 and 59 after AI. Plasma concentrations of bovine pregnancy-associated glycoprotein 1 (bPAG-1) were measured by radioimmunoassay. The results showed that before day 31, ultrasonographic scanning was not very sensitive because six of the 30 calving cows were incorrectly diagnosed as non-pregnant. In five of these animals, the uterus was located far cranial to the pelvic inlet. Five of the cows examined between days 27 and 31 were pregnant on the basis of plasma bPAG-1 levels on the same day, using 0·5 ng/ml as the cut-off point. Plasma levels of bPAG-1 and progesterone proved that four of the cows which had early positive ultrasonographic diagnoses but did not produce a calf, were pregnant when they were examined. [less ▲]

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See detailInfluence of calving season on the interactions among reproductive disorders of dairy cows.
Labernia, J.; Lopez-Gatius, F.; Santolaria, P. et al

in Animal Science Journal (1998), 67

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See detailAnalyse de facteurs d’environnement influençant la récolte d’embryons
Harvengt, Denis; Chapaux, Philippe; Spronck, A. et al

Poster (1998)

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See detailInfluence des régulations situées à l'interface du métabolisme et de la reproduction sur la folliculogenèse et la reprise des cycles en post-partum
Drion, Pierre ULg; Houtain, J. Y.; Drame, El Hadji Daour et al

(1998)

Le déroulement harmonieux de la sexualité de la femelle repose sur l'intégrité anatomique, histologique, biochimique et hormonale des structures ovariennes, hypothalamiques, hypophysaires et utérines ... [more ▼]

Le déroulement harmonieux de la sexualité de la femelle repose sur l'intégrité anatomique, histologique, biochimique et hormonale des structures ovariennes, hypothalamiques, hypophysaires et utérines impliquées, ainsi que sur le subtil dosage des différentes hormones et facteurs protéiques intervenant dans les régulations. La compréhension des mécanismes régulateurs - endocrines, autocrines et paracrines (voir cadre ci-dessous)- qui permettent l'alternance des phases de croissance folliculaire et lutéale constitue un prérequis indispensable à la maîtrise de la cyclicité de la femelle, à la gestion optimale d'un cheptel et plus particulièrement à l'optimisation du capital génétique qu'il représente pour l'éleveur. La présente synthèse vise à faire le point sur les connaissances actuelles relatives aux aspects morphologiques et aux mécanismes régulateurs de la formation des ovaires, de la folliculogenèse et de l'endocrinologie de l'activité ovarienne. [less ▲]

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See detailRegolazione della crescité follicolare e luteinica. Folliculogenesi e atresia. Summa.
Drion, Pierre ULg; Beckers, Jean-François ULg; Ectors, Fabien ULg et al

in Summa (1997), 14(9), 5-16

Hypophyseal production of FSH and LH depends on a pulsating secretion of GnRH by the Hypothalamus. At the beginning of the cycle, this secretion sets free the FSH from the hypothesis responsible for ... [more ▼]

Hypophyseal production of FSH and LH depends on a pulsating secretion of GnRH by the Hypothalamus. At the beginning of the cycle, this secretion sets free the FSH from the hypothesis responsible for follicular recruiment. The recruited follicles produce estradiol, inhibin and follistatin which reduce the FSH secretion (negative feed back) reducing their support to hormonodependant follicles which become atresic. The dominant follicle, subjected to internal self stimulation is not sensitive to the reduction in FSH levels and carries on synthesising more and more estradiol. [less ▲]

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See detailZastosowanie ultrasonografii w diagnostyce klinicznej ukladu rozrodczego u bydla
Gajewski, Z.; Hanzen, Christian ULg; Thun, R. et al

in Nowa Weterynaria (1997)

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See detailRegolazione della crescité follicolare e luteinica. Ovulazione, corpo luteo e luteolisi. Summa.
Drion, Pierre ULg; Ectors, F. J.; Hanzen, Christian ULg et al

in Riproduzione dei ruminanti (1997), 14(9), 17-25

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See detailRegolazione della crescité follicolare e luteinica. Ovulazione, corpo luteo e luteolisi
Drion, Pierre ULg; Ectors, Fabien; Hanzen, Christian ULg et al

in Riproduzione dei Ruminanti (1997), 14(9), 17-25

Most ovarian follicles (99.9%) will end up with follicular atresia. During antral stages atresia depends on a reduction of FSH levels secondary to estradiol and inhibin secretions by the dominant follicle ... [more ▼]

Most ovarian follicles (99.9%) will end up with follicular atresia. During antral stages atresia depends on a reduction of FSH levels secondary to estradiol and inhibin secretions by the dominant follicle. Plasma levels in estradiol higher than 12pg/ml for at least 12 hours in bovine will cause the reversal of the negative feed-back effect of estradiol on the hypothalamus inducing the preovulatory peak of LH. So that the ovulatory discharge does not occur prematurely, the dominant follicle also secretes GnSIF which desensitises the hypohtesis to the action of GnRH. After ovulation, the corupus luteum, a true endocrine gland, develops. [less ▲]

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