ISSN:
0003-276X
Keywords:
Life and Medical Sciences
;
Cell & Developmental Biology
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Medicine
Notes:
Breeding records of the ia strain of rats have shown interesting cases of anomalous pregnancies where second litters are delivered either before or soon after weaning the first litter. This strain is characterized by a retardation of bone resorption which is inherited as a simple Mendelian recessive factor.Heterozygous and homozygous males are mated with females of both genotypes. One male and four females are kept in a breeding cage and the female rat is isolated either in the late stage of pregnancy or soon after birth of the litter.Nineteen anomalous pregnancies have been reported and the occurrence of the anomaly has been attributed to copulation during pregnancy. The ancestry of 13 cases is traced to four animals, two homozygous males and two heterozygous females, and the genetic pattern has been demonstrated.
Additional Material:
1 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/ar.1091450209
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