The effects of defective nutrition during pregnancy in farm livestock.

The extent of the loss of life and productivity associated with the breeding of farm livestock is summarized in Table I and shows that in farm stock the stillbirth rate is usually much higher than that in man and that animal infant mortality exceeds human infant mortality by a factor of at least four, and usually ten. Furthermore, in animals maternal mortality rates, particularly in sheep, grossly exceed the maternal mortality rate in human populations.