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See detailDosages radioimmunologiques
Beckers, Jean-François ULg; Ectors, Francis ULg

Poster (1978, March)

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See detailDiagnostic précoce de gestation chez les différentes espèces animales
Delahaut, Philippe; Beckers, Jean-François ULg; Ectors, Francis ULg

in Annales de Médecine Vétérinaire (1978)

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See detailInduction de l'oestrus chez les génisses en anoestrus fonctionnel
Beckers, Jean-François ULg; Wouters-Ballman, Patricia; Ectors, Francis ULg et al

in Annales de Médecine Vétérinaire (1978), 122

Fuctional anoestrus is frequently encountered during winter months and most specially in beef cattle. Ovaries and genital tract display a resting, dormant conditions. Progesterone, 17-beta-oestradiol and ... [more ▼]

Fuctional anoestrus is frequently encountered during winter months and most specially in beef cattle. Ovaries and genital tract display a resting, dormant conditions. Progesterone, 17-beta-oestradiol and LH as measured by radioimmunoassay remain at a very low level. Insertion of an intravaginal device "Abbovestrol Prid" (progesterone 2.3 g 17-beta-oestradiol 10mg) is successful. During the course of the treatment; progesterone reaches normal (corpus luteum induced) levels; 17-beta-oestradiol which is at first very high decreases to a mean value of 4-5 pg/ml; LH remains at a basal level but rises slowly at the end of the treatment. Removal of the insert is generally (16/20) followed by oestrus after c.a. 48 hours. This oestrus is characterized by a normal hormonal profile. However, a PMSG injection when the insert is removed raises chances of favourable result. [less ▲]

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See detailEvolution du taux de cortisol plasmatique chez le veau de la naissance à l'âge de 14 jours
Massip, Alban; Wouters-Ballman, Patricia; Beckers, Jean-François ULg et al

in Comptes Rendus de l'Académie des Sciences de Paris (1977), 285

Plasma cortisol was recorded in 15 calves from birth to 14 days of age by a radioimmunoassay technique. At birth mean cortisol value is 67.3 ng/ml; 6 hours later it decreases by 58.4% then it gradually ... [more ▼]

Plasma cortisol was recorded in 15 calves from birth to 14 days of age by a radioimmunoassay technique. At birth mean cortisol value is 67.3 ng/ml; 6 hours later it decreases by 58.4% then it gradually diminishes and about 14 days after, it reaches adult levels (5.1 ng/ml). [less ▲]

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See detailDonnées récentes en gynécologie animale
Derivaux, Jules; Ectors, Francis ULg; Beckers, Jean-François ULg

in Annales de Médecine Vétérinaire (1976), 120

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See detailHormonelle Befunde bei Störungen der Ovarialfunktion des Rindes
Derivaux, Jules; Ectors, Francis ULg; Beckers, Jean-François ULg

in Deutsche Tierärztlich Wochenschrift (1976), 83

The hormonal pattern was studied in 54 animals: 34 heifers with seasonal anoestrus, 13 cows with post-partum anoestrus, 5 cows with nymphomania and 2 cows superovulated. Seasonal and post partum anoestrus ... [more ▼]

The hormonal pattern was studied in 54 animals: 34 heifers with seasonal anoestrus, 13 cows with post-partum anoestrus, 5 cows with nymphomania and 2 cows superovulated. Seasonal and post partum anoestrus are characterized by basal levels of progesterone, FSH and LH, while oestradiol level is more variable and higher in post partum anoestrus due to the proper activity of the ovary. Nymphomania is a hyperfolliculinemic syndrome; cystic puncture leads to a fall in oestradiol and a surge in FSH and LH but of inequal intensity. The level of the latter hormone is often too low to induce luteinization; cystic degeneration of the ovary is associated with LH deficiency. In superovulated cows, hormonal pattern is like in normal cyclic cows but more pronounced. [less ▲]

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See detailProstaglandines et cycle sexuel chez les animaux domestiques
Derivaux, Jules; Ectors, Francis ULg; Beckers, Jean-François ULg

in Bulletin et Mémoires de l'Académie Royale de Médecine de Belgique (1976), 131

In some domestic animal species, cow, ewe, sow, mare, luteal regression and therefore oestral regulation, depends on the action of a luteolytic of uterine origin. This luteolysine should be but a ... [more ▼]

In some domestic animal species, cow, ewe, sow, mare, luteal regression and therefore oestral regulation, depends on the action of a luteolytic of uterine origin. This luteolysine should be but a prostaglandin F2 alpha or an analogue. Progesterone is the regulator of the cycle; plasma level is low (basic level) at day of oestrus (0,5ng/ml) then increases gradually to reach a peak value of 6 to 9 ng/ml at days 6 to 16 of the cycle. Beta-oestradiol level fluctuates including a main peak before ovulation (9 pg/ml) and three accessory peaks at days 4-5, 8, 12-14 of the cycle; however the peak of the 8th day is inconstant. FSH and LH levels are constant during dioestrus, peak level values are observed at the beginning of oestrus, they are practically superposed and of a 6 to 9 hours duration. Administration of prostaglandins during luteal phase produces hormonal changes similar to those observed during the normal cycle. Because of its luteolytic action and its effect on uterine fibre, prostaglandin F2 alpha offers a special interest for stock farming and veterinary medicine. So a full expression can be given to AI and a more extended application of egg transfer can be foreseen. It constitutes an effective therapy in the case of corpus luteum persistence and a way to induce parturition. [less ▲]

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See detailVariation du 17 ß oestradiol au cours du cycle oestral chez la vache
Ectors, Francis ULg; Beckers, Jean-François ULg; Ballman, Patricia et al

in Comptes Rendus de l'Académie des Sciences de Paris (1975), 281

Le dosage du 17 beta oestradiol plasmatique, sans recours préalable à la chromatographie de partage, a pu être réalisé et ce en raison de la haute spécificité de l'antisérum utilisé. Le 17 beta oestradiol ... [more ▼]

Le dosage du 17 beta oestradiol plasmatique, sans recours préalable à la chromatographie de partage, a pu être réalisé et ce en raison de la haute spécificité de l'antisérum utilisé. Le 17 beta oestradiol augmente à partir du 18e jour du cycle jusqu'à atteindre 8,6 pg/ml (6,4 à 12,6 pg/ml) au début de l'oestrus. Outre ce pic oestral, 3 pics accessoires peuvent être détectés: le premier, pratiquement constant, se situe entre le 4e et le 5e jour, le second moins important et seulement retrouvé chez 75% des sujets survient entre le 12e et le 14e jour. Enfin, le troisième, très inconstant, se retrouve parfois au 8e jour. Le taux basal moyen chez la vache est de 1,75 pg/ml. [less ▲]

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See detailLe dosage radioimmunologique de la progestérone plasmatique chez la vache
Beckers, Jean-François ULg; Ballman, Patricia; Ectors, Francis ULg et al

in Comptes Rendus de l'Académie des Sciences de Paris (1975), 280

Le dosage de la progestérone chez la vache a été réalisé par la méthode radioimmunologique sans purification préalable. Le taux de progestérone varie de 0,60 ng/ml le jour de l'oestrus à 6,4 ng/ml durant ... [more ▼]

Le dosage de la progestérone chez la vache a été réalisé par la méthode radioimmunologique sans purification préalable. Le taux de progestérone varie de 0,60 ng/ml le jour de l'oestrus à 6,4 ng/ml durant la phase d'activité maximale du corps jaune. En fin de cycle oestral, la chute du taux de progestérone est rapide (24h) et elle survient 48 à 72 h avant les chaleurs. [less ▲]

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See detailAperçu sur les méthodes de dosage des stéroïdes.
Beckers, Jean-François ULg; Ballman, Patricia; Ectors, Francis ULg et al

in Annales de Médecine Vétérinaire (1975), 119

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