Grants and Contracts Details
Description
Reproductive efficiency in US dairy herds continues to decline as milk production per cow increases. One factor
that contributes to poor fertility is a well documented decrease in the efficiency of estrus detection. Both
managerial and biological factors have undoubtedly contributed to the decline in efficiency of estrus detection.
The objective of this experiment is to determine if the occurrence, timing, duration or intensity of estrus is related
to the pattern of endogenous estradiol secretion observed during the periovulatory period in 50 lactating cows
during the normal breeding period (60-80 days postpartum). We will measure concentrations ofLH during this
period to determine if the occurrence, timing and magnitude of the LH surge are related to the endogenous
pattern of estradiol secretion as well. We will also measure daily milk production. Upon completion of this
experiment, we may be able to determine I) if the occurrence and duration of estrus is related to the peak
concentration or pattern of endogenous estradiol secretion, 2) if the occurrence and magnitude of the LH surge is
related to the peak concentration or pattern of endogenous estradiol secretion, 3) if the relative timing of estrus
and the LH surge is related to the peak concentration or pattern of endogenous estradiol secretion, 4) if the peak
concentration or pattern of endogenous estradiol is re]ated to the amount of mi]k being produced. This
information will provide the basis for future studies designed to enhance expression of estrus.
Status | Finished |
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Effective start/end date | 8/1/06 → 7/31/08 |
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