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• W2099195409 abstract "Rabbit does can be mated shortly after parturition and sustain concurrent pregnancy and lactation. Six experiments were performed in order to assess the effects of lactation on foetal growth and survival in primiparous rabbits, and to establish the origin of these effects. Comparison of reproductive performance of pregnant does, concurrently lactating or not, showed that foetal survival (−9.6%) and weight (−16%) at day 28 of pregnancy, were lower in females lactating 10 young. The harmful effects of lactation on foetal survival and growth were related to the size of the suckled litter (−5.2% and −9% in females suckling four young). Simultaneously pregnant and lactating does increased their feed intake (+56%). However, this increase was not sufficient to meet energy requirements for both milk production and foetal development. Therefore, the energy balance was negative (−11.8 MJ in does lactating 10 young) and these females had to mobilise both protein and lipid body reserves. The results suggest that the nutritional deficit occurring in lactating does induces a competition between the mammary glands and the pregnant uterus for the nutrient supply which was detrimental to foetal growth. The hyperprolactinemic status associated with lactation seems to be responsible, at least in part, for the lower foetal survival and the reduced concentration of progesterone (−21%) in lactating does. However, we could not establish a clear influence of this decrease in progesterone on foetal mortality. La lapine peut être fécondée aussitôt après la parturition et conduire une gestation et une lactation simultanées. Six expériences ont été réalisées afin de déterminer les effets de la lactation sur la mortalité et la croissance foetales chez la lapine primipare, et d’établir l’origine de ces effets. La comparaison des performances de reproduction de lapines gravides, allaitantes ou non, ont montré que la survie (−9.6%) et la croissance foetales (−16%) au 28ème jour de gestation, sont plus faibles chez les femelles allaitant 10 lapereaux. Cet effet négatif de la lactation sur la mortalité et la croissance foetales sont proportionnels à la taille de la portée allaitée (−5.2% et −9% chez les femelles allaitant quatre lapereaux). Les femelles simultanément gravides et allaitantes augmentent leur ingestion d’aliment (+56%). Cependant, cette augmentation est insuffisante pour satisfaire à la fois les besoins énergétiques pour la production laitière et le développement foetal. Par conséquent, le bilan énergétique de ces femelles est négatif (−11.8 MJ chez les femelles allaitant 10 lapereaux) et elles doivent mobiliser leurs réserves protéiques et lipidiques. Nos résultats suggèrent que le déficit nutritionnel qui survient chez les femelles allaitantes entraı̂ne une compétition entre les glandes mammaires et l’utérus gravide pour la répartition des nutriments qui se réalise au détriment de la croissance foetale. L’hyperprolactinémie associée à la lactation semble, au moins partiellement, responsable de la diminution de la survie foetale et de la progestéronémie (−21%) chez les femelles allaitantes. Toutefois, nous n’avons pas pu établir de relations claires entre la diminution des niveaux de progestérone et la mortalité foetale chez ces animaux." @default.
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• W2099195409 date "1999-07-01" @default.
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• W2099195409 title "Physiological mechanisms involved in the effects of concurrent pregnancy and lactation on foetal growth and mortality in the rabbit" @default.
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• W2099195409 doi "https://doi.org/10.1016/s0301-6226(99)00096-2" @default.
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