It seems that HSP90 plays an important role in
mammary development and differentiation in the cow,
with the highest concentrations of protein being present
in mammary tissues from late pregnant and early
lactating animals [31]. Although similar relationships
have not been established for HSP70 or in lymphocytes,
the observed parity class difference could also reflect
differences in lactation physiology between primiparous
and pluriparous cows.