The 21st century cows' diet are rife with:
Pesticides
Fertilizers
Herbicides
Dioxins
Traces of Heavy Metals & Radio Active Materials
Synthetic Growth Hormones
Other Chemicals

Because of unnatural feed and unhealthy environments, most cows tend to have significant health problems. Many of them are routinely injected with antibiotics (almost every couple of weeks) which will then show up in the milk. For example, the presence of antibiotics in milk can be one of the reasons for the failure in yoghurt or cheesing making.

Synthetic Hormone
stimulates cancer cells development & growth
causes premature maturity in children

Fats
cause obesity, heart disease, and a host of other degenerative diseases.

Antibiotics
weaken immune system
wipe out intestinal flora in our intestinal tracts
produce mutated drug-resistant strains of bacteria
increase bacteria-related food borne illness

Unnatural feed, chemical pesticides & heavy metals
poisons remain in cow's fat tissues
store up in human fat cells
cause side effects
create diseases - mad cow

Before you take the next sip of milk, check the label, is it free from all the above harmful elements? If not, think again the side effects of these elements and consider a change of brand!