After 1970, as the need for milk expanded, scientists used a process known as cross breeding, in which local cows (Indian cows) are bred (artificially) with the sperm of bulls of European breeds, which are known generically as “Bos taurus.”
Compared to normal animals, crossbred animals have improved standard production traits such milk production, growth rate, and overall animal protein production.
A wider diversity of cattle and other livestock has been shown to improve production efficiency and minimise the amount of resources and inputs farmers must invest in livestock production. A few breeds produce up to 4300 kg of milk per year, reproduce about 8 calves during their reproductive life span, and the lactation period persists for more than 10 months
Some other advantages include:
Calves grow faster
Gains maturity quite early in about 14 months
Begin to reproduce in about 2 years
Reproduce regularly once in 15-20 months
The breeding period persists for more than 10 months