Embryo survival in lactating dairy cows
Carmill, J.A.; Zarkouny, S.E.; Hensley, B.A.; Stevenson, Jeffrey S.
Rates of embryo survival in lactating
dairy cows were assessed in three separate
studies. Based on pregnancy diagnoses 27 to
29 days after timed inseminations, survival to
days 40 to 50 or day 57, depending on the
study, varied from 9 to 88% in cows that
were not cycling before insemination compared
to 57 to 90% in cows that were cycling.
Previously anestrous cows had lower rates of
survival. In one study, supplementing cows
with progesterone before insemination improved
embryo survival.
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