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These data are representative of assays performed with two independent litters of rat pups.
Low intensity exercise and varying proportions of dietary glucose and fat modify milk and mammary gland compositions and pup growth.
Animal technicians regularly socialized with the pups inside their pens.
The vocalizations are a by-product of the pups' physiological response to cold stress that involves non-shivering thermogenesis in brown adipose tissue.
Birth of pups after transfer of mouse embryos derived from vitrified preantral follicles.
A total of 22 recipients were used for embryo transfer and one became pregnant, giving birth to seven normal, live pups 20 days after transfer.
All pups from these two litters appeared normal.
The scalp was then sutured, the pup warmed and returned to the dam.
The female pronucleus to some extent also has effects on progeny hair colour, which is proved by the production of 2 pups with grey hair.
Ten pups from five litters born during 1998 were monitored from weaning to approximately 12 weeks of age for nematode infections.
Furthermore, cross-fostering studies demonstrate the importance of maternal behavior as a regulator of the development of regulatory systems in their pups.
Recipient females were allowed to deliver and raise their own pups.
Only rats that bred at least six pups were used.
Among the 7 pups born, 5 were black and 2 were grey.
Six of the 11 mice from which the progeny had been examined after the first delivery had infected at least 1 of their pups.
