 Another of Lysenko's theories was that obtaining more milk from cows did not depend on their genetics but on how they were treated.The better they were handled and taken care of, the more milk would be obtained; Lysenko and his followers were well known for taking very good care of their livestock.Lysenko claimed that the cuckoo was born when young birds such as warblers were fed hairy caterpillars by the parent (rather than host) birds; this claim failed to recognise that the cuckoos he described were brood parasites.