Influence of prolactin on foetal survival in rabbit does

Fortun, Laurence; Bolet, Gérard; Lebas, François

doi:10.1016/0378-4320(94)01319-5

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…Rabbit does are able to contemporarily sustain lactation and pregnancy; however, lactation negatively affects the reproductive functions mainly for hormonal and energetic reasons [20,21]. Prolactin is mainly responsible for the hormonal antagonism [22], whereas the energy deficit is due to the relevant production of milk and to its high caloric value [10].…”

mentioning

confidence: 99%

Long term effect of post-weaning rhythm on the body fat and performance of rabbit doe

Castellini¹,

Bosco²,

Cardinali³

2006

Reprod. Nutr. Dev.

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-Reproductive protocols based on standard (Control: 11 days post-partum) or extended rhythm (PW: post-weaning at 27 days post-partum) were compared. Two groups of fifty 19-weekold New Zealand White females were inseminated for seven consecutive cycles. The kits were weaned at 26 days. On the day of AI, all the does were submitted to ultrasound scanning of the perirenal regions to measure fat thickness. The fertility rate and several indexes of efficiency were calculated. Fat thickness, estimated perirenal fat and live weight were higher in PW does. The does submitted to post-weaning rhythm had a higher sexual receptivity (P < 0.01), and fertility rate (P < 0.01) whereas litter size and pre-weaning mortality were not affected. Primiparous Control does showed a particularly low fertility rate; the value increased successively but was always lower than in PW does. PW rhythm in comparison with the standard one seemed more adapted to doe reproductive physiology even if there was a lower production (35.0 vs. 38.8 rabbit sold/year) and risk of fatness (18% of multiparous does). rabbit doe / fertility / rhythm of insemination

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mentioning

confidence: 99%

Long term effect of post-weaning rhythm on the body fat and performance of rabbit doe

Castellini¹,

Bosco²,

Cardinali³

2006

Reprod. Nutr. Dev.

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“…In rabbits, the concentration of progesterone is known to be lowered by an increased serum concentration of prolactin (Fuchs et al. 1984) and treating pregnant rabbits with prolactin resulted in high foetal mortality (Fortun et al. 1994).…”

Section: Discussionmentioning

confidence: 99%

“…However, there is evidence from studies in other mammals that high concentrations of prolactin and oxytocin during lactation may have negative effects on gestational performance, and vice versa, high concentrations of oestrogen (Cowie 1984) and progesterone (Fuchs et al 1984) during gestation may inhibit milk production. In rabbits, the concentration of progesterone is known to be lowered by an increased serum (Fuchs et al 1984) and treating pregnant rabbits with prolactin resulted in high foetal mortality (Fortun et al 1994). The milk ejection reflex depends on the release of oxytocin which is stimulated during sucking (Cowie 1984).…”

Section: Discussionmentioning

confidence: 99%

Maternal Effort is State Dependent: Energetic Limitation or Regulation?

Rehling

Trillmich

2008

Ethology

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Many small altricial rodents have a postpartum oestrus and are often simultaneously pregnant and lactating. Negative influences of concurrent pregnancy and lactation on both lactational performance and the litter in utero are commonly observed and have been interpreted as resulting from high simultaneous energetic demands of gestation and lactation. We studied these effects in the precocial guinea‐pig (Cavia aperea f. porcellus) that, like many altricial rodents, has a postpartum oestrus, but in which the peaks of energy expenditure on lactation and gestation are widely separated. This life history allowed to investigate whether physiological regulation other than by energetic limitations may be responsible for allocation conflicts arising when lactation and gestation overlap. By comparing simultaneously pregnant and lactating females with lactating non‐pregnant females, we show that females in the former group nurse less and wean earlier than females of the latter group. In a comparison of litter size, litter mass, and pup mortality of females that had not been lactating during pregnancy with females that had been simultaneously pregnant and lactating, we show that the latter do not reduce investment in the following litter. In our study, energetic constraints on ad libitum fed females are unlikely and we therefore suggest that the results must be explained by regulatory constraints on lactational effort. We point out that this explanation has not been excluded for the effects observed in altricial small mammals.

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“…L'hyperprolactinémie associée à la lactation serait également, au moins partiellement, responsable de la diminution des niveaux de progestérone dans le sang périphérique. En effet, ceux-ci sont augmentés chez des lapines allaitantes dont la sécrétion de prolactine est artificiellement inhibée (injections de bromocriptine), tandis qu'ils sont diminués chez des femelles gravides recevant des injections de prolactine (Fortun et al 1994a). Il avait précédemment été souligné que cette hormone lutéotrope possède un rôle permissif à faible concentration, mais qu'à forte concentration elle inhibe la stéroïdogénèse.…”

Section: / Mortalité Embryonnaire Et Foetaleunclassified

Les effets de la lactation sur les performances de reproduction chez la lapine

Fortun-Lamothe¹,

Bolet

1995

INRA Prod. Anim.

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La lapine peut être fécondée aussitôt après la mise bas ou tout au long de la lactation, et être simultanément gravide et allaitante. Néanmoins, la réceptivité des femelles est variable au cours de la lactation : elle est maximale aussitôt après la mise bas (proche de 100 %) et minimale 3-5 jours après (40-65 %). Bien que les résultats expérimentaux concernant les effets de la lactation sur le taux d’ovulation et la mortalité embryonnaire soient parfois contradictoires, la fertilité et la prolificité des lapines allaitantes sont globalement plus faibles que celles des lapines non allaitantes. En effet, la lactation a, d’une manière générale, un effet négatif sur le pourcentage de femelles ovulant (-26 %), le taux de gestation (-33 %), et la viabilité foetale (-10 %). De plus, la lactation entraîne une diminution de la croissance pondérale des foetus (-20 %). L’hyperprolactinémie et la faible progestéronémie chez les lapines simultanément gravides et allaitantes, ainsi que le déficit nutritionnel engendré par la production laitière, semblent être les principaux facteurs responsables des effets observés.

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Influence of prolactin on foetal survival in rabbit does

Cited by 9 publications

References 21 publications

Long term effect of post-weaning rhythm on the body fat and performance of rabbit doe

Long term effect of post-weaning rhythm on the body fat and performance of rabbit doe

Maternal Effort is State Dependent: Energetic Limitation or Regulation?

Les effets de la lactation sur les performances de reproduction chez la lapine

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