With due regards to all the veterinarians who have tried to explain the causes and put forth their veiw point, I would like to sugest that, we cannot single out any one nutritional cause for still births in dairy
Yes, if the still births are rampant and account for more than 50% of the herd, we definitely have to analyse the levels of Heavy Metals in feed, roughage & water.
If the cases are sporadic, then may be the cause is Negative Energy Balance in the animal as suggested by Mr. Ravinder.
This is basically because of the Energy Priorities of the Dairy Cow.
Whenever there is NEB, the first priority of the cow is its own Maintainance. This will definitely lead to Stillbirths
In the Priority List of the Cow, Foetal Growth is the Third Last Priority followed by Breeding.
hence we have to pay high concentrtion towards the Energy Balance of the Cow, which will definitely prevent most of the reproductive and metabolic problems