My experience is that regular cleaning of this area can dramatically reduce the build-up of bugs.
Cleaning out pens and using an appropriate disinfectant is particularly important when dealing with cryptosporidium which is very resistant and can survive for months.
When dealing with crypto use a disinfectant that is active against crypto-oocysts in both calving pens and calf housing.
Remember your stomach tube is a fantastic tool for sick calves but never use the same tube to deliver colostrum to the newborn.
When dealing with a calf scour outbreak, regular cleaning and disinfection of feeding equipment reduces the spread.
Having the availability of hot (boiling) water near calf facilities can be great aid with overall hygiene.
It really helps when you can clean out calf pens easily.
On several farms I have used industrial floor paint on concrete calf pens for quick and easy disinfection.
Another technique I have found useful when dealing with calf scour is snatching calves from cows early.
This is where calves are removed from their mothers within two hours of being born to reduce exposure to disease.
Infections can enter the newborn calf by three routes: orally, nasally, or through the navel.
To reduce the risk, wash the navel quickly in hibitane or iodine solution. The navel is a tube so my preference is for dipping as opposed to spraying the navel.
Calf pneumonia is also a huge disease risk to pre-weaned calves.
We can reduce this risk by focusing on colostrum, boosting immunity through vaccination, good nutrition, and by minimising environmental and management stressors on the calf.
Always treat pneumonia cases early and aggressively to prevent chronic cases.
Fresh air contains things like ozone and natural bactericidal agents that will reduce the survival of viruses and bacteria in the air.
This is why fresh airflow is so important above the calf, while minimising direct draughts on calves.
All these are general guidelines but are simple tips which can really benefit the next generation of calves on your farm.