Trying to isolate areas in the whole body
physiology and/or specific parts that might be
responsible for poor fertility within the reproductive
tract in bovines is a challenging task. For example,
several research groups have described poor embryo
quality and conception rate results in lactating cows, but
it is unclear whether early embryonic growth up to day
7 post ovulation are reduced due to inadequate uterine
environment and/or due to (i.e.) overexposure of
oocytes to longer periods of high LH pulsatility - both
hypothesis seem fairly plausible and could potentially
be related to high milk production levels. Interestingly,
it appears that embryo growth following day 7 post
ovulation is compatible with high volumes of daily milk
production since a growing body of scientific literature
(Demetrio et al., 2007) supports the concept that the use
of embryo transfer into lactating cows on day 7 seem to
improve fertility in relation to regular AI. Further
evidence to that is the fact that attempts to increase P4
levels after day 7 generally yield marginal to no results
(Nascimento et al., 2013). These elements argue for at
least nearly normal uterine environment to support
pregnancy to term from day 7 to calving, and sugges
Trying to isolate areas in the whole bodyphysiology and/or specific parts that might beresponsible for poor fertility within the reproductivetract in bovines is a challenging task. For example,several research groups have described poor embryoquality and conception rate results in lactating cows, butit is unclear whether early embryonic growth up to day7 post ovulation are reduced due to inadequate uterineenvironment and/or due to (i.e.) overexposure ofoocytes to longer periods of high LH pulsatility - bothhypothesis seem fairly plausible and could potentiallybe related to high milk production levels. Interestingly,it appears that embryo growth following day 7 postovulation is compatible with high volumes of daily milkproduction since a growing body of scientific literature(Demetrio et al., 2007) supports the concept that the useof embryo transfer into lactating cows on day 7 seem toimprove fertility in relation to regular AI. Furtherevidence to that is the fact that attempts to increase P4levels after day 7 generally yield marginal to no results(Nascimento et al., 2013). These elements argue for atleast nearly normal uterine environment to supportpregnancy to term from day 7 to calving, and sugges
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