Looking at this pedigree, how can you tell that blue skin is a recessive trait?

Most lived to their 80s and 90s without serious illness associated with the skin discoloration. ... "Blood cells always looked so beautiful to me," he says. ... If the blue people did have methemoglobinemia,

Explanation:

common management practices in dairy and poultry farming are: (i) proper shelter facilities and their regular cleaning. (ii) some basic hygienic conditions such as clean water, nutritious food, etc. (iii) animals are kept in spacious, airy, and ventilated place.