Hypothermal stress resistance in the domestic fowl. 1. Evidence of genetic variability.
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A study of the effect of normal environmental conditions on newly hatched chicks with the feather mutant described as "wiry" (Fiser et al., 1973) was carried out. The results indicated that the abnormality should be classified as a potential facultative lethal expressed after hatching.
Fifteen sexually immature, 12-week-old cockerels were unilaterally vasoligated. Eight of these were killed at 4 weeks post-ligation and the remaining 7 at 10 weeks post-ligation. Granulomatous lesions in the ductus deferens were observed in 2 cockerels of the first and in 1 cockerel of the second group. Cysts showing intense granulomatous reactions were present in the epididymis in 1 cockerel of the first group and 4 cockerels of the second group. The seminiferous tubules were not seriously affected. The contralateral organs acted as controls and were grossly and histologically normal.