Browsing by Author "Nak, Yavuz"

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Anti-Müllerian Hormone: a Novel Biomarker for Detecting Bovine Freemartinism
(Wiley, 2024) Koca, Davut; Nak, Yavuz; Sendag, Sait; Nak, Deniz; Turgut, Ali Osman; Avcilar, Talha; Wehrend, Axel
The anti-M & uuml;llerian hormone (AMH) indicates ovarian reserve in cattle, maintaining a consistent trajectory post-puberty. In heterosexual pregnancies, the development of the M & uuml;llerian duct in female foetuses is inhibited, resulting in an anticipated minimal or absent ovarian reserve capacity. This investigation aimed to compare AMH levels in healthy Holstein heifers that had reached puberty with those of freemartin animals of the same breed and age. The study incorporated Holstein heifers reaching puberty between 11 and 15 months of age in Group 1 (G1, n = 20) and freemartin animals in Group 2 (G2, n = 19, 16). AMH measurements (AMH-1/AMH-2) were recorded at 12-day intervals for the study participants. Notably, AMH levels in three freemartin animals could not be detected, prompting statistical analysis based on measurements from the remaining 16 freemartin animals in G2. A statistically significant correlation was observed between two separate measurements in G1 and G2 (p < .001). Furthermore, AMH-1 and AMH-2 levels were statistically higher in G1 than in G2 (p < .001). In G1, AMH-1 levels ranged from 227 to 677 pg/mL, with an average of 367.3 +/- 25.5 pg/mL, and AMH-2 levels ranged from 234 to 645 pg/mL, with an average of 380.8 +/- 24.4 pg/mL. Conversely, in G2, AMH-1 levels ranged from 10 to 72 pg/mL, with an average of 26.8 +/- 4.44 pg/mL, and AMH-2 levels ranged from 12 to 68 pg/mL, with an average of 28.75 +/- 4.18 pg/mL. The mean AMH levels in G1 were approximately 14 times higher than in G2 (p < .001). Consequently, ROC analysis utilizing AMH-1 and AMH-2 data established cut-off values of <= 72 and <= 68 pg/mL respectively for distinguishing freemartin animals. In conclusion, AMH could be used as a reliable biomarker for identifying Holstein freemartin animals.
Evaluation of Serum Anti-Mullerian Hormone Concentrations Following Treatment With Vitamin D in Holstein Friesian Heifers
(Wiley, 2023) Koca, Davut; Nak, Yavuz; Sendag, Sait; Nak, Deniz; Avcilar, Talha; Sahin, Mustafa Eren; Wehrend, Axel
Anti-Mullerian hormone (AMH) levels in the blood of dairy cattle are associated with the count of antral follicles (AFC), ovarian function. Numerous studies, particularly in human medicine, have shown that vitamin D3 (Vit D3) has a positive effect on AMH levels. To our knowledge, the effects of Vit D3 on serum AMH levels in heifers have not been investigated. The goal of the current study was to evaluate the concentrations of serum AMH in dairy heifers following Vit D3 treatment. The study included 20 healthy non-pregnant Holstein Friesian heifers. These animals came to estrus at least once. All heifers received a single intramuscular dosage of 5 million IU Vit D3 (Cholecalciferol). Blood samples were collected from the coccygeal veins of all animals before and after Vit D3 injection (days 7, 14, and 28) for the measurement of AMH and 25(OH)D concentrations. In our analysis, we observed that after exogenous Vit D3 administration, circular 25(OH)D increased constantly (up to day 28 after Vit D3 injection) in all animals. On day 28, AMH concentrations saw a 10% increase in comparison with those measured the day before the Vit D3 injection. However, a comparison of AMH concentrations measured across days did not reveal statistically significant differences between Day 0, 7, 14, and 28 levels (p = .10). Furthermore, no statistical correlation was observed between the pairs (age-AMH) and (weight-AMH). Considering all times, no correlation was found between 25(OH)D and blood AMH levels. These findings demonstrated that exogenous Vit D3 did not affect serum AMH in Holstein Friesian heifers.
Evaluation of Some Systemic Inflammatory Biomarkers in Canine Malignant Mammary Tumors [I]
(Kafkas Univ, veteriner Fakultesi dergisi, 2023) Ekici, Zeynep Merve; Ozyigit, Musa Ozgur; Nak, Deniz; Avci Kupeli, Zehra; Kuruoglu, Fikriye Ecem; Koca, Davut; Nak, Yavuz
The aim of this study is to investigate whether neutrophil-to-lymphocyte ratio (NLR), lymphocyte-to-monocyte ratio (LMR), platelet-to-lymphocyte ratio (PLR), systemic immune-inflammation index (SII), albumin-to-globulin ratio (AGR), and prognostic nutritional index (PNI) parameters could be used as biomarkers for canine malignant mammary tumors (MMTs), and the changes in these parameters according to different tumor (T), lymph node (N), and metastasis (M) stages (TNM I-II-III, TNM IV, TNM V) and the number of affected mammary glands (single, multiple). Thirty-seven with MMT and 20 healthy dogs were used in this study. Complete blood count and biochemistry analysis were performed in all dogs. Tumor material is removed by tru-cut and sent to the pathology laboratory for diagnosis. NLR, PLR, and SII values increased, and LMR and PNI values decreased in dogs with MMT. Median NLR values increased and median LMR and PNI values decreased as the TNM stage progressed. In dogs with a single MMT, median NLR, and PLR values were found to be lower than in dogs with multiple MMTs, and median LMR, SII, AGR, and PNI values were higher. The present results indicated that NLR, LMR, PLR, SII, and PNI parameters could be used as biomarkers for canine MMT. Also, NLR, LMR, PLR, SII, PNI, and AGR parameters may be valuable biomarkers that reveal the degree of systemic immune response according to different TNM stages and the number of affected mammary glands.
Investigation of Relationships Between Serum Lactate, Acute Phase Proteins, Pro/Antiinflammatory Cytokine Levels, and Metritis Formation in Holstein Dairy Heifers
(Tubitak Scientific & Technological Research Council Turkey, 2023) Avcilar, Talha; Koca, Davut; Nak, Yavuz; Sahin, Mustafa Eren; Ozyigit, Musa Ozgur; Nak, Deniz
The main purpose of this investigation was to identify and suggest suitable early screening inflammatory markers for the early diagnosis of uterine infections such as acute septic metritis (ASM) in the Holstein heifers. In addition, to achieve the above-mentioned aim, the objectives of the present study were tried to determine the relationship between blood serum lactate, acute phase proteins (APPs), pro/anti inflammatory cytokine levels, and metritis formation in Holstein heifers. For this purpose, 250 Holstein heifers which were 11-13 months old, were chosen as the study material. After heifers were conceived, blood serum samples were collected at the 8th and 4th weeks before the parturition. In the postpartum period, animals with ASM (n = 15) and healthy animals (n = 15) were identified, and blood serum samples were taken. Lactate, serum amyloid-A (SAA), haptoglobin (Hp), Interleukin-1beta (IL-1 (3), IL-6, IL-8, IL-10, and tumor necrosis factor-alpha (TNF -& alpha;) levels were measured from these collected blood serum samples. Acute-phase proteins, lactate, and pro and anti inflammatory cytokine levels of healthy and animals with ASM were statistically compared. Heifers with metritis had a significantly greater concentration of IL-6 and SAA versus healthy heifers in the prepartum 8th week. In addition, it was determined that IL-6, IL-1(3, IL-10, TNF-& alpha;, and SAA levels were significantly higher in the 4th week before parturition in the ASM group than those of the healthy group. When all these findings are evaluated together, this study suggested that IL-6, and IL-10, can be used as early biomarkers in the prepartum preliminary diagnosis of postpartum important inflammatory processes such as ASM.