List the two ways that have been used and resulted in Sahiwal cows in Punjab from ancestral wild cows.

The two ways are:

1. Cross breeding: In cross breeding, two purebred individuals, coming from different breeds or varieties are mated to produce an offspring. Cross breeding results in the produced progeny having desirable traits of both the parent.

2. Artificial selection: Artificial selection is the intentional breeding of animals or plants. It is the same as selective breeding and is a form of genetic engineering. In this, two adults having a desirable trait are bred together.