Question

Animal husbandry is the science of rearing, feeding and caring, breeding and disease control of animals. It ensures supply of proper nutrition to our growing population through activities like increased production and improvement of animal products like milk, eggs, meat, honey, etc.

1. Poultry production depends upon the photoperiod. Discuss.
2. Polyculture of fishes is of great importance. Discuss.

Answer 1

a) Poultry production depends upon the photoperiod:

1. The photoperiod stimulates the growth and breeding of birds.
2. It increases the life span of birds
3. As it increases the metabolic rate the egg-laying fowl’s wifi lays more eggs.
4. The light induces the endocrine glands and increases hormone secretion.
5. The light intensity depends on its wavelengths.

b) Polyculture of fishes is of great importance:

1. In polyculture, fishes will not fight for food.
2. No deficiency of oxygen.
3. In this culture the upper layer fishes feeds on phy to and zooplanktons the middle layer fishes feeds on
4. submerged plants and fishes lives in the deeper layers feeds on bottom dwellers debris of plants and animals.
5. In polyculture, the fishes use the maximum food to convert it into meat.
6. Fishes have high growth rate in short periods.
   Eg.: Catlacatla, cirrhinus mrigla labeorohita are cultured through polyculture.