Which of the following conditions does high humidity positively contribute to in rabbits?

High humidity can positively contribute to Pasteurellosis in rabbits due to the increased moisture in the environment. Pasteurellosis, caused by the bacterium Pasteurella multocida, is a respiratory disease that can thrive in wet and humid conditions. These environmental factors promote the growth of bacteria and can weaken the immune systems of rabbits, making them more susceptible to infections.

In contrast, the other conditions listed are not positively influenced by high humidity. Coprophagy, the consumption of feces, is a natural behavior in rabbits not specifically linked to humidity levels. Frostbite generally occurs in cold, rather than humid conditions, as it is a response to freezing temperatures. Infertility in rabbits is influenced by various factors, including genetics, health, and nutrition, but high humidity does not directly foster these issues. Thus, high humidity is primarily a contributing factor to the prevalence of Pasteurellosis in rabbits.