How can we increase the prodution of broiler chicken?

How can we increase the production of broiler chicken by the following methods and why?
a)maintenance of temperature and hygienic conditions in housing
b)proper poultry field
c)Prevention and control of disease and pests
d)Isolation of diseased broilers
e)Proper vaccination of broilers
f)Spraying of disinfectants at regular intervals

By changing company policy to only hire people who have enough understanding of the business to provide their own solutions to production problems.