Definition of Environmental physiology

This can be defined as effects of the environment on the growth and performance of farm animals. Normal growth and performance are enhanced when climatic factors like temperature, rainfall, wind, relative humidity, sunlight etc. are moderate.

Effects of Changes in Climate on Growth

1. High intensity of radiation affect food intake of farm animals.
2. High relative humidity leads to heat stress in farm animals e.g. cattle, poultry, pig, etc.
3. Extreme low temperature leads to retarded growth or even death of chicks.
4. At high temperatures also, feather coverage in chicks are poorly developed and this may lead to pecking.
5. Wind aids the spread of air borne disease e.g. tuberculosis.
6. High rainfall leads to the multiplication of tsetse-flies which transmits trypanosomiasis.

Effects of Changes in Climate on Reproduction

1. Heat stress causes abortion in farm animals.
2. High temperature decreases ovulation in animals.
3. At high temperature, fertility and hatchability in breeder birds reduces.
4. High temperature leads to low rate of conception or fertilization in farm animals.
5. Light controls sexual maturity.

Effects of Changes in Climate on Milk Production

1. High temperature reduces the rate of milk production in farm animals.
2. High temperature and rainfall do not favour the rearing of daily animals.
3. High relative humidity favours the growth of disease pathogens that can reduce milk production in farm animals.

Effects of Changes in Climate on Egg Production

The effects include…

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Environmental Physiology