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Article ; Online: Determination of expression patterns of miR-26a, and preimplantation factor levels for early pregnancy detection in nulliparous and multiparous cows.

Olğaç, Kemal Tuna / Yazlik, Murat Onur / Özkan, Hüseyin / Kaya, Ufuk / Tirpan, Mehmet Borga

Reproduction in domestic animals = Zuchthygiene

2024 Volume 59, Issue 1, Page(s) e14521

Abstract: For maximum productivity in a dairy farm, the earliest and the most accurate detection of pregnancy is essential. The aim of this study was to determine the efficacy of expression patterns of miR-26a, and serum Preimplantation Factor (PIF) levels for ... ...

Abstract	For maximum productivity in a dairy farm, the earliest and the most accurate detection of pregnancy is essential. The aim of this study was to determine the efficacy of expression patterns of miR-26a, and serum Preimplantation Factor (PIF) levels for pregnancy diagnosis during the early pregnancy in nulliparous and multiparous cows. A total of 60 cows (30 nulliparous and 30 multiparous Holstein cows) were enrolled in the study. Blood samples were collected for miR-26a on days 8 and 16 (D8 and D16), and for the PIF on days 10 and 20 (D10 and D20) following insemination (D0). Pregnancies were determined by ultrasonography on the 28th day after insemination. Expression levels of miR-26a determined by qPCR. PIF levels were assessed by using commercial ELISA kits. All data were analyzed by using the MIXED procedure of SPSS. The expression levels of miR-26a were 6.64 folds higher on D16 in pregnant compared to non-pregnant multiparous cows (p < .05). On D8 and D16, miR-26a expression levels were found higher 13 folds in pregnant compared to non-pregnant nulliparous cows (p < .05). Additionally, miR-26a expressions were higher 5.42 folds (p < .05) on D8, 7.19 folds higher (p < .01) on D16 in pregnant nulliparous and multiparous cows, and were 6.30 folds higher (p < .001) on D8 and D16 according to non-pregnant animals. PIF levels were greater in pregnant animals (p < .05). Analyzing miR-26a on D8 might be considered as sufficient in nulliparous cows. Pregnancy detection in multiparous cows can be made on the 16th day with this method. Furthermore, PIF evaluations may be sufficient on D10 in multiparous cows. Besides, PIF levels and miR-26a expression levels might be used safely in field conditions and clinical applications.
MeSH term(s)	Female ; Pregnancy ; Cattle ; Animals ; Early Diagnosis ; Parity ; Enzyme-Linked Immunosorbent Assay/veterinary ; Farms ; MicroRNAs
Chemical Substances	MicroRNAs
Language	English
Publishing date	2024-01-25
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1015187-4
ISSN	1439-0531 ; 0936-6768
ISSN (online)	1439-0531
ISSN	0936-6768
DOI	10.1111/rda.14521
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Article ; Online: Ultrasonographic patterns of different regions of uterus according to pregnancy in cows and heifers.

Olğaç, Kemal Tuna / Yazlik, Murat Onur / Kaya, Ufuk / Tirpan, Mehmet Borga

Animal science journal = Nihon chikusan Gakkaiho

2023 Volume 94, Issue 1, Page(s) e13893

Abstract: This study aimed to detect pregnancy within the first 20 days after artificial insemination by evaluating the ultrasonographic patterns of the different regions of uterus in Holstein heifers and cows. Animals were divided into subgroups according to ... ...

Abstract	This study aimed to detect pregnancy within the first 20 days after artificial insemination by evaluating the ultrasonographic patterns of the different regions of uterus in Holstein heifers and cows. Animals were divided into subgroups according to pregnancy on 28th day as pregnant (heifer, n: 15; cow, n: 15) and non-pregnant (heifer, n: 15; cow, n: 15). Images were taken from the ovulation-side cornu uteri (OSC), non-ovulation-side cornu uteri (NOSC), and the corpus uteri (CU) on alternate days from D0 to D20. The images were evaluated by ImageJ software in terms of mean gray value (MGV), homogeneity (HOM), and contrast (CON) and endometrium thickness (ET). The mean MGV and GT and PT interactions, the mean CON and GT and GP interactions, the mean HOM and GP interactions, and the mean ET and GP interactions were statistically significant (p < 0.05). In receiver operating characteristic analyses, D2-D6 for CON and D2, D6, D8, D16, and D20 for HOM of OSC in cows and D8 and D10 MGV and D18 and D20 ET of OSC in heifers had high relationship with positive pregnancy (p < 0.05). The use of echogenicity evaluations and endometrium thickness measurements in reproductive management seems to be suitable for the prediction of pregnancy in cows and heifers.
MeSH term(s)	Pregnancy ; Cattle ; Animals ; Female ; Uterus/diagnostic imaging ; Reproduction ; Insemination, Artificial/veterinary ; Insemination, Artificial/methods ; Ovulation ; Progesterone
Chemical Substances	Progesterone (4G7DS2Q64Y)
Language	English
Publishing date	2023-12-07
Publishing country	Australia
Document type	Journal Article
ZDB-ID	2095161-9
ISSN	1740-0929 ; 1344-3941
ISSN (online)	1740-0929
ISSN	1344-3941
DOI	10.1111/asj.13893
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Article ; Online: The thermographic monitoring in early pregnancy detection in Holstein cows and heifers

OLĞAÇ, Kemal Tuna / YAZLIK, Murat Onur / KAYA, Ufuk / IÖZKAN, Hüseyin / Tırpan, Mehmet Borga

Animal Reproduction Science. 2023 Aug. 05, p.107317-

2023 , Page(s) 107317–

Abstract: This study aimed to conduct a comprehensive investigation to demonstrate early pregnancy detection using thermography in heifers and cows. A total of 60 heifers (n: 30) and cows (n: 30) were divided into two groups as pregnant (n: 15 heifers, n: 15 cows) ...

Abstract	This study aimed to conduct a comprehensive investigation to demonstrate early pregnancy detection using thermography in heifers and cows. A total of 60 heifers (n: 30) and cows (n: 30) were divided into two groups as pregnant (n: 15 heifers, n: 15 cows) and non-pregnant (n: 15 heifers, n: 15 cows) according to the day 28 of gestation. Thermographic images were taken from the vulvar and anal regions on alternate days from D0 to D20. Blood samples were collected to determine estrogen and progesterone concentrations. The mean temperature difference between the anal and vulvar regions (ΔT ᵒC) was used in the statistical analyses. Based on the hormonal profiles, no abnormalities were observed for follicular waves or luteal profiles in heifers and cows. The ΔT ᵒC values between heifers and cows and between days were statistically significant (P<0.001). In thermographic analyses, the differences observed in other main effects and interactions of the group, sampling time, and pregnancy were not statistically significant (P>0.05). In receiver operating characteristic (ROC) analyses, it was concluded that the ΔT ᵒC value of ≤2.9ᵒC (100% Se - 61.9% Sp) was highly correlated with pregnancy diagnosis in cows on day six after artificial insemination (AI) (P<0.001). In conclusion, it was determined that the clinical application of thermography can be used for the detection of pregnancy on day six after AI in cows. However, further studies are needed to determine heifers' thermographic characteristics and profiles.
Keywords	Holstein ; artificial insemination ; blood ; estrogens ; pregnancy ; pregnancy diagnosis ; progesterone ; temperature ; thermography ; Cows ; early pregnancy detection ; heifers ; monitoring
Language	English
Dates of publication	2023-0805
Publishing place	Elsevier B.V.
Document type	Article ; Online
Note	Pre-press version
ZDB-ID	429674-6
ISSN	1873-2232 ; 0378-4320
ISSN (online)	1873-2232
ISSN	0378-4320
DOI	10.1016/j.anireprosci.2023.107317
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Article ; Online: The thermographic monitoring in early pregnancy detection in Holstein cows and heifers.

Olğaç, Kemal Tuna / Yazlık, Murat Onur / Kaya, Ufuk / Özkan, Hüseyin / Tırpan, Mehmet Borga

Animal reproduction science

2023 Volume 256, Page(s) 107317

Abstract	This study aimed to conduct a comprehensive investigation to demonstrate early pregnancy detection using thermography in heifers and cows. A total of 60 heifers (n: 30) and cows (n: 30) were divided into two groups as pregnant (n: 15 heifers, n: 15 cows) and non-pregnant (n: 15 heifers, n: 15 cows) according to the day 28 of gestation. Thermographic images were taken from the vulvar and anal regions on alternate days from D0 to D20. Blood samples were collected to determine estrogen and progesterone concentrations. The mean temperature difference between the anal and vulvar regions (ΔT °C) was used in the statistical analyses. Based on the hormonal profiles, no abnormalities were observed for follicular waves or luteal profiles in heifers and cows. The ΔT °C values between heifers and cows and between days were statistically significant (P < 0.001). In thermographic analyses, the differences observed in other main effects and interactions of the group, sampling time, and pregnancy were not statistically significant (P > 0.05). In receiver operating characteristic (ROC) analyses, it was concluded that the ΔT °C value of ≤ 2.9 °C (100% Se - 61.9% Sp) was highly correlated with pregnancy diagnosis in cows on day six after artificial insemination (AI) (P < 0.001). In conclusion, it was determined that the clinical application of thermography can be used for the detection of pregnancy on day six after AI in cows. However, further studies are needed to determine heifers' thermographic characteristics and profiles.
MeSH term(s)	Pregnancy ; Cattle ; Animals ; Female ; Thermography/veterinary ; Progesterone ; Insemination, Artificial/veterinary ; Insemination, Artificial/methods ; Estrus Synchronization/methods
Chemical Substances	Progesterone (4G7DS2Q64Y)
Language	English
Publishing date	2023-08-05
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	429674-6
ISSN	1873-2232 ; 0378-4320
ISSN (online)	1873-2232
ISSN	0378-4320
DOI	10.1016/j.anireprosci.2023.107317
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Article ; Online: Fertility comparison of frozen bull semen stored in cryogenic deep freezer (-152 °C) and LN

Tırpan, Mehmet Borga / Olğaç, Kemal Tuna / Korkmaz, Fırat / Sonat, Ali / Kaya, Ufuk / Akçay, Ergun

Theriogenology

2022 Volume 185, Page(s) 1–5

Abstract: The present study aimed to use cryogenic deep freezers that could be a feasible alternative for cryopreserved semen storage. A total of 284 straws from three Simmental bulls and 272 Simmental cows were used. The experimental group consisted of 151 semen ... ...

Abstract	The present study aimed to use cryogenic deep freezers that could be a feasible alternative for cryopreserved semen storage. A total of 284 straws from three Simmental bulls and 272 Simmental cows were used. The experimental group consisted of 151 semen straws that were stored at -152 °C for a week. Moreover, the control group consisted of 133 semen straws that were stored at -196 °C. Firstly, two samples per bull (n = 6) were examined in terms of sperm kinetic parameters by CASA. Furthermore, plasma membrane, acrosome integrity (PMAI) and high mitochondrial membrane potential (HMMP) were analyzed by flow cytometry. Then, artificial inseminations were performed on Simmental cows with 272 straws belonging to two groups. Then, 56th-day Non-return Rate (NRR56) was determined. All spermatological data were subjected to a linear mixed model. Chi-Square test was performed to NRR56 between storage temperature groups. Also, logistic regression analysis was used to examine the effect of bull, storage temperature and age of cows on pregnancy status. While age of cows was included in the final logistic regression model, effect of bull x storage temperature was not included because it was found as non-significant. The post-thaw PMOT and STR of cryopreserved bull semen, which was stored at -152 °C, had lower and statistically significant values (p < 0.05). However, frozen bull semen, which were stored at -152 °C, kept its fertility ability as which stored at -196 °C. Besides, NRR56 of semen stored at -152 °C and -196 °C were detected as 57.24% (83/145) and 55.91% (71/127), respectively (p > 0.05). Nevertheless, these results should be supplemented with more pre-freezing and post-thaw sperm quality analyses and more fertility data for increasing the accuracy of the method.
MeSH term(s)	Animals ; Cattle ; Cryopreservation/methods ; Cryopreservation/veterinary ; Female ; Fertility ; Male ; Pregnancy ; Semen ; Semen Analysis/veterinary ; Semen Preservation/methods ; Semen Preservation/veterinary ; Sperm Motility ; Spermatozoa
Language	English
Publishing date	2022-03-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	189232-0
ISSN	1879-3231 ; 0093-691X
ISSN (online)	1879-3231
ISSN	0093-691X
DOI	10.1016/j.theriogenology.2022.03.017
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Article: Fertility comparison of frozen bull semen stored in cryogenic deep freezer (−152 °C) and LN2 container

Tırpan, Mehmet Borga / Olğaç, Kemal Tuna / Korkmaz, Fırat / Sonat, Ali / Kaya, Ufuk / Akçay, Ergun

Theriogenology. 2022 June, v. 185

2022

Abstract	The present study aimed to use cryogenic deep freezers that could be a feasible alternative for cryopreserved semen storage. A total of 284 straws from three Simmental bulls and 272 Simmental cows were used. The experimental group consisted of 151 semen straws that were stored at −152 °C for a week. Moreover, the control group consisted of 133 semen straws that were stored at −196 °C. Firstly, two samples per bull (n = 6) were examined in terms of sperm kinetic parameters by CASA. Furthermore, plasma membrane, acrosome integrity (PMAI) and high mitochondrial membrane potential (HMMP) were analyzed by flow cytometry. Then, artificial inseminations were performed on Simmental cows with 272 straws belonging to two groups. Then, 56th-day Non-return Rate (NRR56) was determined. All spermatological data were subjected to a linear mixed model. Chi-Square test was performed to NRR56 between storage temperature groups. Also, logistic regression analysis was used to examine the effect of bull, storage temperature and age of cows on pregnancy status. While age of cows was included in the final logistic regression model, effect of bull x storage temperature was not included because it was found as non-significant. The post-thaw PMOT and STR of cryopreserved bull semen, which was stored at −152 °C, had lower and statistically significant values (p < 0.05). However, frozen bull semen, which were stored at −152 °C, kept its fertility ability as which stored at −196 °C. Besides, NRR56 of semen stored at −152 °C and −196 °C were detected as 57.24% (83/145) and 55.91% (71/127), respectively (p > 0.05). Nevertheless, these results should be supplemented with more pre-freezing and post-thaw sperm quality analyses and more fertility data for increasing the accuracy of the method.
Keywords	Simmental ; acrosome ; bulls ; chi-square distribution ; cryopreservation ; flow cytometry ; freezers ; membrane potential ; mitochondrial membrane ; plasma membrane ; pregnancy ; regression analysis ; semen ; sperm quality ; statistical models ; storage temperature
Language	English
Dates of publication	2022-06
Size	p. 1-5.
Publishing place	Elsevier Inc.
Document type	Article
ZDB-ID	189232-0
ISSN	1879-3231 ; 0093-691X
ISSN (online)	1879-3231
ISSN	0093-691X
DOI	10.1016/j.theriogenology.2022.03.017
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Book ; Online ; Thesis: Computational modeling of low-density lipoprotein transport in human coronary arteries

Olgaç, Ufuk

implications for atherosclerosis

2009

Author's details	by Ufuk Olgaç
Language	English
Size	Online-Ressource (1 Band), Ill
Publisher	ETH
Publishing place	Zürich
Document type	Book ; Online ; Thesis
Thesis / German Habilitation thesis	Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 18750--Zürich, 1875
Database	Former special subject collection: coastal and deep sea fishing

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Book ; Online ; Thesis: Computational modeling of low-density lipoprotein transport in human coronary arteries

Olgaç, Ufuk

implications for atherosclerosis

2009

Author's details	by Ufuk Olgaç
Language	English
Size	Online-Ressource (1 Band), Ill
Publisher	ETH
Publishing place	Zürich
Document type	Book ; Online ; Thesis
Thesis / German Habilitation thesis	Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 18750--Zürich, 1875
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Reply to "Letter to the editor: 'The plausibility of arterial-to-venous oxygen shunting in the kidney: it all depends on radial geometry'".

Olgac, Ufuk / Kurtcuoglu, Vartan

American journal of physiology. Renal physiology

2015 Volume 309, Issue 2, Page(s) F181–2

MeSH term(s)	Humans ; Kidney/metabolism ; Oxygen/metabolism ; Oxygen Consumption/physiology ; Renal Circulation/physiology
Chemical Substances	Oxygen (S88TT14065)
Language	English
Publishing date	2015-07-15
Publishing country	United States
Document type	Comment ; Letter ; Research Support, Non-U.S. Gov't
ZDB-ID	603837-2
ISSN	1522-1466 ; 0363-6127
ISSN (online)	1522-1466
ISSN	0363-6127
DOI	10.1152/ajprenal.00221.2015
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Article: The Bohr Effect Is Not a Likely Promoter of Renal Preglomerular Oxygen Shunting.

Olgac, Ufuk / Kurtcuoglu, Vartan

Frontiers in physiology

2016 Volume 7, Page(s) 482

Abstract: The aim of this study was to evaluate whether possible preglomerular arterial-to-venous oxygen shunting is affected by the interaction between renal preglomerular carbon dioxide and oxygen transport. We hypothesized that a reverse (venous-to-arterial) ... ...

Abstract	The aim of this study was to evaluate whether possible preglomerular arterial-to-venous oxygen shunting is affected by the interaction between renal preglomerular carbon dioxide and oxygen transport. We hypothesized that a reverse (venous-to-arterial) shunting of carbon dioxide will increase partial pressure of carbon dioxide and decrease pH in the arteries and thereby lead to increased oxygen offloading and consequent oxygen shunting. To test this hypothesis, we employed a segment-wise three-dimensional computational model of coupled renal oxygen and carbon dioxide transport, wherein coupling is achieved by shifting the oxygen-hemoglobin dissociation curve in dependence of local changes in partial pressure of carbon dioxide and pH. The model suggests that primarily due to the high buffering capacity of blood, there is only marginally increased acidity in the preglomerular vasculature compared to systemic arterial blood caused by carbon dioxide shunting. Furthermore, effects of carbon dioxide transport do not promote but rather impair preglomerular oxygen shunting, as the increase in acidity is higher in the veins compared to that in the arteries. We conclude that while substantial arterial-to-venous oxygen shunting might take place in the postglomerular vasculature, the net amount of oxygen shunted at the preglomerular vasculature appears to be marginal.
Language	English
Publishing date	2016-10-27
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2564217-0
ISSN	1664-042X
ISSN	1664-042X
DOI	10.3389/fphys.2016.00482
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