ISSN:0012-1630    

DOI:10.1002/dev.420060602

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractMature guinea‐pigs which had been heat stressed at different gestational ages along with their treated and untreated controls were tested on a black‐white serial discrimination task with 1 reversal. A significant difference resulted between animals stressed at 40‐44 days gestation and their treated controls, but only on perseverative errors on the reversal task. No differences existed between animals stressed at 56‐60 days gestation and their treated controls, nor between the various control

ISSN:0012-1630    

DOI:10.1002/dev.420060603

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractMaternal acceptance of foster young was altered by the interaction of the type of delivery of the rat pup and the presence or absence of placenta or liver. The presence of tissues which the mother ate did not alter the survival among normally delivered pups, but decreased survival among surgically delivered pups. Injecting the mothers with homogenates of these tissues indicated that eating of the placenta or liver by the mother was not essential for the effects. A 3rd experiment simulated normal and surgical delivery by washing surgically delivered animals with saline and smearing normally delivered animals with amniotic fluids, respectively. The data from this experiment showed that survival of the young was determined by the presence or absence of amniotic fluids on the pup interacting with the presence or absence of some material present in the placenta and liver.

ISSN:0012-1630    

DOI:10.1002/dev.420060604

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractMice were observed for a period of 37 weeks by a continuous monitoring procedure. The data are presented in weekly blocks and differences across time are noted. A definite increase in fighting was observed beginning at approximately 5 weeks and increasing to a peak at the 7th week, then declining to a low at 12 weeks. A later peak occurred around the 19th week. In overall amounts of aggression the females were low, male littermates (MLM) intermediate, and male nonlittermates (MNLM) were highest.

ISSN:0012-1630    

DOI:10.1002/dev.420060605

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

ISSN:0012-1630    

DOI:10.1002/dev.420060606

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractBiochemical and behavioral effects of pre‐ and postpartum hyperphenylalaninemia were evaluated on 52 Sprague‐Dawley rats. Biochemical results indicated elevated plasma phenylalanine levels during both the prepartum (Gestation Days 15‐21 and postpartum Days 1‐60 of age) injection phases. Behaviors were evaluated beginning at 81 days of age. Compared to control or postpartum subjects, prepartum subjects demonstrated significant decrements on each of the following: initial DRL: 12 learning; fearfulness (inverse relationship); activity; exploration; and sociability. Compared to controls, postpartum subjects were significantly less active and less expl

ISSN:0012-1630    

DOI:10.1002/dev.420060607

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractSeparate groups of C3H and Swiss‐Webster (S‐W) mice received 25 escape training trials in a straight alley at 8 or 10 days of age. Each of these groups was then divided into 3 retention groups, receiving an additional 25 training trials, 1, 6, or 24 hr following original training. Comparisons of the retest scores with original training scores, as well as with litter‐mate controls without prior training, indicated that both strains trained at 8 days of age failed to demonstrate retention of learning when retested 24 hr after training, although they showed reliable 1‐hr retention and some evidence of 6‐hr retention. However, mice trained at 10 days of age performed better on the retention tests at all retest intervals than they had on original training, as well as better than maturation controls without prior training. These results indicate that a 24‐hr retention capacity for escape training develops between 8‐10 days of age in both

ISSN:0012-1630    

DOI:10.1002/dev.420060608

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractSix heterosexual pairs of 3‐yr‐old rhesus monkeys which had no previous experience with other‐sexed peers were allowed 1, 2, or 3 weeks to form social attachments. Attachment strength was evaluated by observation of the subjects' responses to seperation and reunion. Those pairs which were together for the shortest period of time exhibited the greatest amount of disturbance at separation, but they were also the most distrubed prior to separation and at reunion. The behavior of females was influenced more by length of pairing than was the behavior of

ISSN:0012-1630    

DOI:10.1002/dev.420060609

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractThe administration of testosterone propionate (TP) to nulliparous mice between Days 13‐18 of gestation resulted in a reduction of maternal nest building as assessed by measuring the amount of nesting material brought into the home cage. Nest building, evoked in nulliparae by the presence of young, was also significantly reduced by TP treatment. In addition, the administration of TP concurrently with progesterone prevented the latter from eliciting nest buildin

ISSN:0012-1630    

DOI:10.1002/dev.420060610

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY

摘要:

AbstractRats were either handled, shocked, or unmanipulated during the preweaning period or during the 21 days immediately following weaning. At maturity animals were tested in 2 passive avoidance situations. Half the animals were first tested in an illness‐induced taste aversion situation using sour water as the CS and different doses of cyclophosphamide as the US. The remaining animals were first tested in a 1‐trial passive avoidance situation using a “step‐through” apparatus and a single electric shock. Early experience had no effect on the development of a taste aversion at any dosage of cyclophosphamide. Prior conditioning of a taste aversion did influence performance in the step‐through avoidance situation. Fewer of these previously conditioned animals attained the training criterion and, within this previously conditioned population, the handled groups displayed less “emotional” behavior than the controls. Response latencies in the shock‐induced passive avoidance test did not differentiate between handled and shocked animals. Animals manipulated prior to weaning had consistently shorter latencies than the unman

ISSN:0012-1630    

DOI:10.1002/dev.420060611

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1973

数据来源: WILEY