Andresen E, Willeberg P
Nord Vet Med. 1976 Oct;28(10):481-6.
Previous observations suggested that pituitary dwarfism of German Shepherd dogs is due to simple, autosomal recessive inheritance, but own data were insufficient to test the hypothesis. The total material now includes six dwarfs from five litters. Omitting the proband litter, a total of 21 dogs from four litters, each with one dwarf, were relevant for testing goodness of fit. The observed segregation ratio was in agreement with that expected and thus supported the genetic hypothesis. According to this hypothesis it was possible to point at various heterozygous carriers among ancestors of the dwarfs within a pedigree comprising 13 generations.
先前的观察结果表明，德国牧羊犬的垂体性侏儒症是由简单的常染色体隐性遗传所致，但我们自己的数据不足以验证这一假设。目前的全部资料包括来自五窝的6只侏儒犬。除去先证者那一窝，来自四窝的总共21只犬（每窝有1只侏儒犬）与适合度检验相关。观察到的分离比与预期相符，因此支持了该遗传学假设。根据这一假设，在一个包含13代的家系中，可以指出侏儒犬祖先中的各种杂合子携带者。
