ArticleThe Journal of veterinary medical science2026
The nurturing ability of PVG-RT7b rats is strongly affected by the fetal environment.
Article in The Journal of veterinary medical science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Our strain of inbred PVG-RT7b (PVG.7b) rats was at risk of failing to be maintained owing to frequent neonatal death. Only 23.5% of mothers succeeded in nurturing their offspring at the first parturition. Furthermore, mothers failing to nurture their offspring at first parturition also failed in the second one. Here, we investigated the cause of frequent neonatal deaths in PVG.7b rats. Exchanging newborn offspring between PVG.7b and Wistar-Imamichi (WI) rats. resulted in 80.0% of WI mothers succeeding in nurturing PVG.7b offspring, whereas only 18.2% of PVG.7b mothers succeeded in nurturing WI offspring. These findings indicate that the neonatal mortality of PVG.7b is due to maternal factors rather than inherent offspring issues. Additionally, we examined the mammary glands of PVG.7b immediately after the second parturition. PVG.7b rats, which initially failed to nurture, exhibited normal mammary gland development and milk production after the second birth. These results suggested that neonatal death is due to maternal behavior. Moreover, we investigated the nurturing ability of PVG.7b rats nurtured by WI foster mothers (PVG.7b
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