Physiologie de la Reproduction animale TOME 3 (de 3)

Learning material (2005)

Ce document reprend le 3è TOME de "Physiologie de la Reproduction" de "Drion, Beckers, Derivaux, Hanzen, Ectors". Daprès le même intitulé ("Derivaux, Ectors, Reproduction chez les animaux domestiques ... [more ▼]

Ce document reprend le 3è TOME de "Physiologie de la Reproduction" de "Drion, Beckers, Derivaux, Hanzen, Ectors". Daprès le même intitulé ("Derivaux, Ectors, Reproduction chez les animaux domestiques", Cabay, Louvain la neuve, 1986), revisité et mis à jour, avec l'aide des auteurs, annuellement de 2000 à 2005. Il constitue la base de l'enseignement du cours de 3è Bac en Médecine Vétérinaire à l'Université de Liège. [less ▲]

Physiologie de la Reproduction animale TOME 1 (de 3)

Learning material (2005)

Ce document reprend le 1er TOME de "Physiologie de la Reproduction" de "Drion, Beckers, Derivaux, Hanzen, Ectors". Daprès le même intitulé ("Derivaux, Ectors, Reproduction chez les animaux domestiques ... [more ▼]

Ce document reprend le 1er TOME de "Physiologie de la Reproduction" de "Drion, Beckers, Derivaux, Hanzen, Ectors". Daprès le même intitulé ("Derivaux, Ectors, Reproduction chez les animaux domestiques", Cabay, Louvain la neuve, 1986), revisité et mis à jour, avec l'aide des auteurs, annuellement de 2000 à 2005. Il constitue la base de l'enseignement du cours de 3è Bac en Médecine Vétérinaire à l'Université de Liège. [less ▲]

L'anoestrus du post-Partum

in Vlaams Diergeneeskundig Tijdschrift (1984), 53

The authors give a survey of the actual knowledge about the fundamental endocrinology of the ovarian cycle in the bovine. In an experiment using 5 dry cows, 20 cows milked twice daily, and 5 freely ... [more ▼]

The authors give a survey of the actual knowledge about the fundamental endocrinology of the ovarian cycle in the bovine. In an experiment using 5 dry cows, 20 cows milked twice daily, and 5 freely suckled cows, a comparative study was made about the post partum ovarian activity by checking heat, by rectal palpation, and by analysis of daily blood and milk samples for ovarian steroids and gonadotropins. For the 3 groups of cows, the first postpartum ovulation was noted at respectively 23, 45, 115 days after parturition. Originally it was thought that a hypersecretion of prolactin was responsible, but no effect could be observed after administration of the prolactin-inhibitor bromocryptine. More recent experimental studies have shown that milking and especially suckling acts as a stess factor, provoking an increased secretion and release of corticosteroids and a decreased blood level of LH, largely responsible for the prolonged post-partum anoestrus period. The logical treatment is weaning, but this technique is often economically difficult to apply in beef cattle. The most indicated alternative treatment to speed up the first postpartum oestrus is the use of the vaginal coil (PRID) containing 2-3 g of progesterone and carrying a capsule with 10 mg of oestradiolbenzoate. The latter stimulates the resorption of progesterone. The coil was removed after 12 days and 500 IU of PMSG were injected. In anoestrous beef cattle, an ovulatory oestrus was induced with a conception rate of 45%. [less ▲]

Induction de l'oestrus chez les génisses en anoestrus fonctionnel

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 ▲]

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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