Search Results - "Gümen, A"

Reducing dry period length to simplify feeding transition cows: milk production, energy balance, and metabolic profiles by Rastani, R R, Grummer, R R, Bertics, S J, Gümen, A, Wiltbank, M C, Mashek, D G, Schwab, M C

“…Sixty-five Holstein cows were used to evaluate management schemes involving altered dry period (DP) lengths on subsequent milk production, energy balance (EB),…”
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Physiological classification of anovulatory conditions in cattle by Wiltbank, M.C., Gümen, A., Sartori, R.

“…Evaluation of follicular growth patterns by ultrasound combined with measurement of circulating reproductive hormones has allowed designation of three…”
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Reduced dry periods and varying prepartum diets alter postpartum ovulation and reproductive measures by Gümen, A, Rastani, R R, Grummer, R R, Wiltbank, M C

“…There has been substantial recent interest in shortening dry periods; however, the effects of this management change on reproduction have not been adequately…”
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Ultrasonographic evaluation of endometrial thickness near timed AI as a predictor of fertility in high-producing dairy cows by Souza, A.H, Silva, E.P.B, Cunha, A.P, Gümen, A, Ayres, H, Brusveen, D.J, Guenther, J.N, Wiltbank, M.C

“…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…”
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Follicular size and response to Ovsynch versus detection of estrus in anovular and ovular lactating dairy cows by Gümen, A, Guenther, J N, Wiltbank, M C

“…In a commercial dairy herd, 316 lactating Holsteins were studied to determine the percentage of anovular cows, to examine follicular sizes in anovular cows,…”
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Association among lipopolysaccharide, the transforming growth factor–beta superfamily, follicular growth, and transcription factors in spontaneous bovine ovarian cysts by Çolakoğlu, H.E., Küplülü, S., Polat, I.M., Pekcan, M., Özenç, E., Baklacı, C., Seyrek-İntaş, K., Gümen, A., Vural, M.R.

“…The aim of this study was to investigate some of the growth and transcriptional factors originating from oocytes and granulosa cells in follicular fluid and to…”
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Effects of presynchronization with gonadotropin-releasing hormone-prostaglandin F2α or progesterone before Ovsynch in noncyclic dairy cows by Yilmazbas-Mecitoglu, G, Karakaya, E, Keskin, A, Alkan, A, Okut, H, Gümen, A

“…The aim of this study was to evaluate the efficiency of presynchronization with GnRH and PGF(2α) or with progesterone on overall Ovsynch (OVS) outcomes in…”
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Comparison of gonadorelin products in lactating dairy cows: Efficacy based on induction of ovulation of an accessory follicle and circulating luteinizing hormone profiles by Souza, A.H., Cunha, A.P., Silva, E.P.B., Gümen, A., Ayres, H., Guenther, J.N., Wiltbank, M.C.

“…This study evaluated whether the four gonadorelin products that are commercially available in the United States produce comparable ovulation responses in…”
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Comparison of artificial insemination versus embryo transfer in lactating dairy cows by Sartori, R., Gümen, A., Guenther, J.N., Souza, A.H., Caraviello, D.Z., Wiltbank, M.C.

“…Conception rates (CR) are low in dairy cows and previous research suggests that this could be due to impaired early embryonic development. Therefore, we…”
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A GnRH/LH surge without subsequent progesterone exposure can induce development of follicular cysts by Gümen, A, Sartori, R, Costa, F M J, Wiltbank, M C

“…Our hypothesis was that follicular cysts would develop if cows experienced an estradiol-induced GnRH LH surge in the absence of an ovulatory follicle. Further,…”
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Effects of GnRH, PGF2α and oxytocin treatments on conception rate at the time of artificial insemination in lactating dairy cows by Gümen, A., Keskin, A., Yilmazbas-Mecitoglu, G., Karakaya, E., Cevik, S., Balci, F.

“…In several studies, hormones such as gonadotropin-releasing hormone (GnRH), prostaglandins and oxytocin were used to increase pregnancy rate by inducing…”
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Managing the dominant follicle in lactating dairy cows by Wiltbank, M.C, Sartori, R, Herlihy, M.M, Vasconcelos, J.L.M, Nascimento, A.B, Souza, A.H, Ayres, H, Cunha, A.P, Keskin, A, Guenther, J.N, Gumen, A

“…Reproductive efficiency is not optimal in high-producing dairy cows. Although many aspects of ovarian follicular growth in cows are similar to those observed…”
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The Role of Luteinizing Hormone in Regulating Gene Expression During Selection of a Dominant Follicle in Cattle by WENXIANG LUO, GUMEN, Ahmet, HAUGHIAN, James M, WILTBANK, Milo C

“…At approximately 8.5 mm in diameter, the future dominant follicle is "selected" for continued growth in cattle. In the present study, cows were treated with a…”
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Effect of presynchronization strategy before Ovsynch on fertility at first service in lactating dairy cows by Gumen, A, Keskin, A, Yilmazbas-Mecitoglu, G, Karakaya, E, Alkan, A, Okut, H, Wiltbank, M.C

“…The aim of this study was to evaluate the effect of presynchronization with or without the detection of estrus on first service pregnancy per artificial…”
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Effect of hCG vs. GnRH at the beginning of the Ovsynch on first ovulation and conception rates in cyclic lactating dairy cows by Keskin, A., Yilmazbas-Mecitoglu, G., Gumen, A., Karakaya, E., Darici, R., Okut, H.

“…Ovulatory response to the first GnRH of Ovsynch is a very important factor for determining the outcome of a successful synchronization. The aim of the present…”
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Extending the postpartum anovulatory period in dairy cattle with estradiol cypionate by Haughian, J M, Sartori, R, Guenther, J N, Gümen, A, Wiltbank, M C

“…Estradiol cypionate (ECP), a long-acting estrogen, has been used therapeutically in early postpartum (PP) dairy cows. In experiment 1, effects of ECP on…”
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Fertility in Dairy Cows After Artificial Insemination Using Sex‐Sorted Sperm or Conventional Semen by Karakaya, E, Yilmazbas‐Mecitoglu, G, Keskin, A, Alkan, A, Tasdemir, U, Santos, JEP, Gumen, A

“…The aim of this study was to compare pregnancy per artificial insemination (P/AI) after timed AI with sex‐sorted sperm (SS) or conventional semen (CS) in…”
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Reducing the duration between gonadotropin-releasing hormone (GnRH) and prostaglandin F₂α treatment in the Ovsynch protocol to 6 days improved ovulation to second GnRH treatment, but inclined to reduce fertility by Yilmazbas-Mecitoglu, G, Karakaya, E, Keskin, A, Alkan, A, Gumen, A

“…The aim of this study was to test Ovsynch (OVS) versus modified OVS (decreasing the interval between first GnRH and PGF2α to 6d) protocols on pregnancy per…”
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Dry Period Management and Optimization of Post‐Partum Reproductive Management in Dairy Cattle by Gumen, A, Keskin, A, Yilmazbas‐Mecitoglu, G, Karakaya, E, Wiltbank, MC

“…Dry period and early post‐partum management are decisive factors for fertility in lactating dairy cows. Previous studies have shown that decreased dry matter…”
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Associations of bovine beta-casein and kappa-casein genotypes with genomic merit in Holstein Friesian cattle by Ardicli, Sena, Aldevir, Özgür, Aksu, Emrah, Kucuk, Kerem, Gümen, Ahmet

“…The relationship between the index values used to evaluate the genomic value and essential markers such as casein genes provides important information at the…”
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