Variations de la LH, de la FSH, du 17 ß oestradiol et de la progestérone au cours du cycle oestral de la chienne

in Annales de Médecine Vétérinaire (1979), 123

Plasma levels of progesterone, 17-beta-oestradiol, LH and FSH were measured by radioimmunoassay in five beagle bitches during two consecutive estrous cycles. Progesterone level rises at the end of ... [more ▼]

Plasma levels of progesterone, 17-beta-oestradiol, LH and FSH were measured by radioimmunoassay in five beagle bitches during two consecutive estrous cycles. Progesterone level rises at the end of proestrus to reach 40 to 50ng/ml and then decreases progressively to its basal level (0.64 ng/ml), attained 80 to 100 days after oestus. A 17-beta-oestradiol peak (75.1 pg/ml) is evident in proestrus and reaches its maximum level 24h before LH surge. The fall of estrogen leads to a discharge of gonadotropins lasting 48 to 72 hours. The FSH surge reaches his maximum level 48 h after that of LH. Pregnancy does not change the secretory pattern of these hormones but progesterone falls just before parturition. [less ▲]

Diagnostic précoce de gestation chez les différentes espèces animales

in Annales de Médecine Vétérinaire (1978)

Evolution du taux de cortisol plasmatique chez le veau de la naissance à l'âge de 14 jours

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 ▲]

Hormonelle Befunde bei Störungen der Ovarialfunktion des Rindes

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 ▲]

Variation du 17 ß oestradiol au cours du cycle oestral chez la vache

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 ▲]

Aperçu sur les méthodes de dosage des stéroïdes.

in Annales de Médecine Vétérinaire (1975), 119

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