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Recent studies on fluctuating dental asymmetry have isolated single stressors as causative agents. Since most stressors are composite in nature, the present study was designed to determine the effects of the interaction of stressors in the induction of fluctuating dental asymmetry. Pregnant rats were assigned to one of six treatment groups and stressed with(More)
The mode of inheritance of mating behavior and blood testosterone levels were examined in lines of chickens selected for high and low mating frequency and the randombred population from which the selected lines originated. Comparisons involved purelines and reciprocal crosses among them. Circulating plasma testosterone levels of a random sample of all males(More)
Experiments were conducted in lines of chickens selected for high (HW) and low (LW) body weight to determine effects of dosage of antigen, line, sex-linked dwarfism, and plasma thyroid hormone concentrations on antibody titers to sheep red blood cells (SRBC). The greatest separation of lines and of dwarf-normal genotypes occurred with an intermediate dose(More)
Two populations of small White Plymouth Rock chickens, one selected for low 8-wk body weight and the other a line of Bantam, were crossed to produce reciprocal Fi’s. In the next generation, individuals of the parental and reciprocal Fl populations were mated to produce all 16 possible populations including parentals, Fi’s, F2’s and backcrosses. Because the(More)
Two generations of crosses between a population of White Plymouth Rock Bantams and a line of White Plymouth Rocks selected for low body weight for 31 generations were produced. Characteristically, the Bantams had produced a high proportion of normal eggs, but hen-day normal egg production in this population was low. The hens selected for low body weight(More)