scholarly journals Maternal Influence on Activity Rhythms and Reproductive Development in Djungarian Hamster Pups1

1986 ◽  
Vol 34 (4) ◽  
pp. 655-663 ◽  
Author(s):  
Barbara L. Pratt ◽  
Bruce D. Goldman
1993 ◽  
Vol 265 (4) ◽  
pp. R749-R755 ◽  
Author(s):  
T. M. Lee

The importance of maternal photoperiodic history during lactation on the postnatal development of meadow vole pups was tested by cross-fostering pups on the day of birth between photorefractory females (housed for 26 wk in a 10:14-h light-dark cycle before mating) and photosensitive females (housed for 2 wk in a 10:14-h light-dark cycle before mating). Control pups were cross-fostered to females with the same photoperiodic history as the gestational dam. Somatic growth and food intake of cross-fostered pups were influenced by the photoperiod of the postnatal lactating dam. Pre- and postnatal maternal photoperiodic history interacted with the sex of the offspring to influence reproductive development. Pelage development was determined exclusively by the prenatal maternal photoperiodic history. The impact of a postnatal maternal influence on pup development of photoperiod-sensitive traits is discussed.


1987 ◽  
Vol 253 (6) ◽  
pp. E701-E704 ◽  
Author(s):  
D. R. Weaver ◽  
J. T. Keohan ◽  
S. M. Reppert

The duration of the nocturnal elevation of melatonin in the dam is a key feature in providing the Djungarian hamster fetus with a prenatal photoperiodic history. The developing animal compares the prenatal photoperiod with the photoperiod experienced during the postnatal period to properly time puberty. In the present report, we define the period during gestation when melatonin administered to the dam is effective in providing the fetus with a prenatal photoperiodic history. The administration of melatonin (50 ng delivered over 10 h at night) by timed infusions to pregnant, pinealectomized Djungarian hamsters for the last 4-7 days of gestation stimulated testicular weights of male pups reared in 14 h of light/day. Single 10-h melatonin infusions were ineffective in stimulating reproductive development (testes weights on day 34) of the male pups, irrespective of the gestational age of the fetus at the time of treatment. In contrast, two consecutive nightly 10-h infusions during gestation clearly stimulated testicular development. The gestational age of the fetus at the time of infusion strongly influenced the response, however. Treatments beginning between 6 and 3 days before birth were effective in stimulating postnatal reproductive development of the offspring. These results indicate that there is a well-delineated, sensitive period during prenatal development when melatonin can provide the fetus with a prenatal photoperiodic history.


1987 ◽  
Vol 116 (3_Suppl) ◽  
pp. S179-S180 ◽  
Author(s):  
M. BERGMANN ◽  
C. LEETZ ◽  
J. SCHINDELMEISER ◽  
E.M. KINDERMANN ◽  
M. KUTZNER ◽  
...  

2019 ◽  
Vol 2019/2 ◽  
pp. 41-64
Author(s):  
S. C. ROWELL

CONCUBINE AND ENCHANTRESS: KATARZYNA TELNICZANKA AND HER BLACK MYTH Summary S.C. R O W E L L Katarzyna Hochstadt of Telnicz (ca 1480–1528), mistress of Sigismund the Old, mother of John of the Lithuanian Dukes, bishop of Vilnius (1519–36) and Poznań (1536–38) has come down in history as an enchanting beauty or a witch, or both. Her image is defined by her relationship with powerful men – her lover, her son, her husband (Andrzej Kościelecki, castellan of Wojnicz and sub–treasurer of the Crown of Poland) and alleged victims (various royal secretaries and high–ranking clerics). This article assesses what little by way of solid evidence is known of her life and how this can be related with the image of man–chasing vamp, interference in the running of the diocese of Vilnius (thereby allegedly provoking the appointment of bishop protectors to the see) and scandal in village and town (according to one seventeenth–century historian). There is evidence that while John of the Lithuanian Dukes was still a minor and enjoyed the rank of provost of Płock and Poznań and canon of Kraków the property associated with his office was overseen by his step–father and perhaps by his mother. After John became bishop of Vilnius, Her Magnificence the Bishop‘s Mother, the Lady Dowager Castellan of Wojnicz and Sub–Treasurer of the Crown of Poland resided for some time at her son‘s court in Vilnius and on at least two occasions exercised her maternal influence to facilitate access to the bishop for canons (Stanislaw Dambrowka, Martin of Dusniki and Albert Wielezinski) involved in a dispute with their brother canon and scholast Jakub Staszkowski. The detailed discussion of internal cathedral disputes in the presence of a lay person, and even worse, a woman, scandalised members of the Cathedral Chapter but there is no evidence that Lady Katarzyna sought to determine the outcome of this case. We also know that she patronised at least one noblewoman (the widowed sister–in–law of Bishop Albert Tabor) who subsequently adopted Bishop John as her son and heir and made financial endowments on both the bishop and his mother. After Katarzyna died in Vilnius in the late summer of 1528 her corpse was transported to Kraków for burial by a Vilnius canon, Erasmus Eustachii, whose family had connections with Andrzej Kościelecki and Bishop John of Vilnius. The satirical verse penned by Andrzej Krzycki concerning a mother–stepmother and father–stepfather (Katarzyna and King Sigismund) and „an old hag who stinks like a goat“ represents neo–Latin literary exercises provoked by fear of the influence at the royal court of Katarzyna and her family rather than an accurate and literal description of Katarzyna and her activities.


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