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Başlık: Ultrasonographic evaluation of endometrial thickness near timed AI as a predictor of fertility in high-producing dairy cows
Yazarlar: Souza, Alexandre H
Silva, Eduardo P.B.
Cunha, Arcelina Pacheco
Ayres, Henderson
Brusveen, D. J.
Guenther, Jerry N.
Wiltbank, Milo Charles
Uludağ Üniversitesi/Veterinerlik Fakültesi/Veteriner Doğum ve Jinekoloji Anabilim Dalı.
Gümen, Ahmet
AAH-1406-2021
6602393069
Anahtar kelimeler: Reproductive biology
Veterinary sciences
Endometrial thickness
Ultrasound
Ovsynch
Pregnancy rates
Dairy cattle
In-vitro fertilization
Bovine estrous-cycle
Pregnancy rates
Uterine growth
Estradiol-17-beta
Implantation
Heifersuterus
Proliferation
Bos
Yayın Tarihi: 1-Mar-2011
Yayıncı: Elsevier
Atıf: Souza, A. H. vd. (2011). "Ultrasonographic evaluation of endometrial thickness near timed AI as a predictor of fertility in high-producing dairy cows". Theriogenology, 75(4), 722-733.
Özet: The objectives were to evaluate changes in endometrial thickness (ET) near the time of a synchronized ovulation and to assess the relationship of ET and fertility in lactating Holstein cows, with or without estrogen supplementation near timed ovulation. In Experiment 1, eight cows were examined with transrectal ultrasonography, once daily for 5 d, starting concurrent with PGF(2 alpha) (PGF) treatment during an Ovsynch protocol (GnRH - 7d - PGF - 72h - GnRH). The ET increased rapidly after PGF (from similar to 7 to similar to 9.5 mm), remained > 9 mm for the next 2 d, then decreased to similar to 8 and 7.4 mm, 1 and 2 d, respectively, after the second GnRH. In Experiment 2,642 cows (total of 758 breedings) were subjected to an Ovsynch protocol (GnRH - 7d - PGF - 56h - GnRH - 16h - timed AI); cows received either no further treatment (Ovsynch) or 1 mg of estradiol-17 beta im 8 h before the second GnRH (Ovsynch + E2). For both uterine horns, ET was measured (similar to 2 cm from the internal uterine body bifurcation) before E2 treatment (48 h after PGF). In cows with ET <= 8 mm vs > 8 mm, rates of ovulation were 86.0% (n = 136) vs 98.1% (n = 472; P < 0.01), respectively, and percentage pregnant per AT (P/AI) were 26.7% (n = 146) vs 42.7% (n = 524; P < 0.01). Treatment with E2 increased P/AI in cows with lower ET (Ovsynch + E2 = 37.0% vs Ovsynch = 23.3%; P = 0.07), but did not significantly improve P/AI in cows with ET > 8 mm (Ovsynch + E2 = 43.4% vs Ovsynch = 42.1%). In conclusion, a single ultrasonographic evaluation of ET in Holstein cows 48 h after PGF treatment in an Ovsynch program was a good predictor of ovulation failure and pregnancy success. Perhaps poor fertility in cows with reduced ET was low peripheral E2 concentrations near AI, poor P4 priming, or luteolysis failure during timed AI procedures.
URI: https://doi.org/10.1016/j.theriogenology.2010.10.013
https://pubmed.ncbi.nlm.nih.gov/21196031/
http://hdl.handle.net/11452/22753
ISSN: 0093-691X
1879-3231
Koleksiyonlarda Görünür:Scopus
Web of Science

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