Many attempts to improve livestock in the tropics have been made by 'upgrading ' through crossbreeding them with temperate breeds. The major problems faced during the failed cattle breeding are

Options

A. the breeding programmes have been too complicated in term of logistics, technology and requirements of resources without considering the infrastructure available.
B. indiscriminate crossbreeding of indigenous breeds with exotic breeds without enough consideration of environment conditions for production.
C. lack of analysis of the different socio-economic and culture roles that liverstock play in each situation, usually leading to wrong breeding objectives and neglect of the potential of various indigenous breeds of livestock.
D. All of these

Answer

D

Explanation

In general livestock in tropical regions are less productivity than those in temperate parts of the globs. They are smaller and have yield of milk, wool or meat. The reason may be climatic differences or genetic difference or both. Breeding to upgrade these species by mating with temperate species has been but is not quite successful.