I will second Bison on this one in that you more than likely have BVD in your herd now. Here is short explanation on BVD and its effect of unborn calves.
"Pregnant animals
If infection is acquired by a cow between 55 and 100 days of gestation, abortion is likely to occur. Another possible outcome of infection before 120 days of gestation is the production of Persistently Infected (PI) calves. These animals will be discussed further below. Infection in the third trimester (180–300 days) can still cause abortion but most commonly produce a normal but seropositive calf due to the immunocompetency of the fetus."
"PI Animals
PI animals are produced when a fetus is infected while partially immunocompetent, thus recognising the viral cells as self and not mounting an immune response. They are therefore antigen positive and antibody negative. PI animals tend to never reach their productive potential, exhibiting stunted growth, reduced fertility and increased susceptibility to other diseases. However, if a PI dam is able to reproduce then their offspring will be PI calves.
These animals are a constant source of virus for other vulnerable members of the herd and therefore a significant risk and a vital target for BVD control programs. They cannot be identified serologically as they are seronegative. PI animals are virus positive so they can be detected by antigen test (e.g. PCR)."
I would test the cow and calf. IF they test positive they would go to slaughter if they where mine. Then you need to start vaccinating for it and other controls.
IF the cow/calf do not test positive for BVD. Then you might has some dwarfism in the blood line of the mother or bull. I would check into that so you do not have more cases of it.
It could also just be that one it 10,000 calves that is just not right. LOL
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