Influence of the blood concentration of prolactin on the length of the sensitive period for establishing maternal behavior in sheep at parturition
| Autor: | Ildiko Raksanyi, Pascal Poindron, Pierre Le Neindre, Guy Kann, P. Orgeur |
|---|---|
| Rok vydání: | 1980 |
| Předmět: |
medicine.medical_specialty
Period (gene) Biology Dexamethasone Maternal behaviour Behavioral Neuroscience chemistry.chemical_compound Endocrinology Blood concentration Pregnancy Internal medicine medicine Animals Maternal Behavior Bromocriptine Labor Obstetric Sheep Estradiol Endocrine and Autonomic Systems Maternal Deprivation Domestic sheep reproduction Prolactin chemistry Pituitary hormones Estradiol benzoate Female medicine.drug |
| Zdroj: | Hormones and behavior. 14(2) |
| ISSN: | 0018-506X |
| Popis: | The fading of postpartum maternal interest for the neonate (sensitive period) in ewes separated from their young at lambing is delayed when parturition is induced with 20 mg of estradiol benzoate (EB). An experiment was carried out to investigate the role of prolactin in this phenomenon. The sensitive period was studied in three groups of parturient ewes. In all groups lambs were removed at birth and reintroduced to their mothers 24 hr later. Maternal acceptance was tested at this time. In group 1 (dexamethasone D), ewes were induced to lamb with dexamethasone (15 mg im). In group 2 (EB), ewes were treated with 20 mg of estradiol benzoate (im). In group 3 (EB + CB 154) ewes received 20 mg of EB as in group 2 and 1 mg of CB 154 (sc) every 12 hr to prevent the enhanced secretion of prolactin which normally occurs after EB injection. The concentration of prolactin was highest in group 2 (EB), lowest in group 3 (EB + CB), and intermediate in group 1 (D) (p ⩽ 0.001 between groups). By contrast, the proportion of ewes showing maternal behavior was similar in groups 2 and 3 ( 15 23 and 17 22 ), both of which differed from group 1 ( 3 22 ; p ⩽ 0.005 ). It is concluded that the lengthening of the sensitive period for establishing maternal behavior in sheep following EB induced parturition is not related with high levels of prolactin in the peripheral circulation. |
| Databáze: | OpenAIRE |
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