Endometrial epidermal growth factor profile and its abnormalities in dairy cows
| Autor: | Masaharu Moriyoshi, Seiji Katagiri, Yojiro Yanagawa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
medicine.medical_specialty
Time Factors Biopsy Estrous Cycle Biology Breeding High yielding cows 03 medical and health sciences Endometrium 0302 clinical medicine Epidermal growth factor Internal medicine medicine Animals Lactation 030219 obstetrics & reproductive medicine medicine.diagnostic_test Epidermal Growth Factor Estradiol Postpartum Period Uterus 0402 animal and dairy science food and beverages Reproducibility of Results Endometrial epidermal growth factor (EGF) 04 agricultural and veterinary sciences 040201 dairy & animal science Dairying Endocrinology Fertility Reduced fertility Animal Science and Zoology Cattle Female Original Article Repeat breeding hormones hormone substitutes and hormone antagonists Repeat breeder |
| Zdroj: | The Journal of Reproduction and Development |
| ISSN: | 0916-8818 |
| Popis: | Normal cows have 2 peaks in endometrial epidermal growth factor (EGF) concentrations on Days 2-4 and 13-14, and the absence of peaks has been linked to reduced fertility in repeat breeder (RB) cows. However, the timing of the peaks (i.e., day of examinations) was estimated for a few cows per cycle day. Therefore, the present study characterized EGF peaks and examined if the absence of peaks in RB cows indicate either peak loss or changed timing. In Study 1, 20 Holstein cows were examined for EGF concentrations between Days 1 and 6 using repeated biopsy of the uterine endometrial tissues. Sixteen cows exhibited increased EGF concentrations for 2-3 days between Days 2 and 5. All 16 cows exhibited increased EGF concentrations on Day 3. In Study 2, 10 cows were examined for EGF concentrations between Days 11 and 16. Increased EGF concentrations for 2-3 days were found in 7 cows between Days 12 and 15. All 7 cows exhibited increased EGF concentrations on Days 13 and 14. In Study 3, 12 RB cows were examined for endometrial EGF concentrations between Days 1 and 6. Four cows exhibited an increase of EGF concentrations on Days 3 and 4, whereas 8 cows (66.7%) exhibited low EGF concentrations throughout the study period. In conclusion, Days 3 and 13-14 are suitable days to examine a cyclic change of endometrial EGF concentrations. Further, low EGF concentrations on Day 3 in RB cows indicated an absence, but not altered timing, of the EGF peak. |
| Databáze: | OpenAIRE |
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