Person: DİKMEN, SERDAL
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DİKMEN
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SERDAL
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Publication Effect of oestrous expression prior to timed artificial insemination with sexed semen on pregnancy rate in dairy cows(Wiley, 2022-11-16) Güner, Barış; Ertürk, Melih; Dursun, Mehmet; Öztürk, Buse; Yılmazbaş-Mecitoğlu, Gülnaz; Keskin, Abdulkadir; Dikmen, Serdal; Gümen, Ahmet; Yılmazbaş-Mecitoğlu, Gülnaz; KESKİN, ABDULKADİR; DİKMEN, SERDAL; GÜMEN, AHMET; Veteriner Fakültesi; Zootekni Ana Bilim Dalı; 0000-0002-5611-4993; HGP-8282-2022; AAH-3831-2021; A-5731-2018; AAH-1406-2021The objectives of the study were to determine (1) oestrous expression rate and (2) the effect of oestrous expression prior to progesterone-based Ovsynch protocol on pregnancy rate in Holstein cows. All cows (n = 917) were subjected to 7-day progesterone-based Ovsynch protocol. In this protocol, cows that expressed oestrus before (HEAT1) the scheduled second GnRH were inseminated 20 h later after the onset of oestrus without GnRH administration. Cows that expressed oestrus after the second GnRH administration (HEAT2) or did not express oestrus (NOHEAT) received fixed-timed AI. Oestrous expression was determined by using activity-rumination monitoring system and all cows were inseminated with sexed semen. Oestrous expression rate prior to FTAI was 40.5% and the majority (p < .01) of oestrous expression were in HEAT2 compared with HEAT1 in both primiparous (71.8 vs. 28.1%) and multiparous cows (69.5 vs. 30.5%). The mean interval from intravaginal device removal to the onset of oestrus was 47.4 +/- 0.9 h and 62.9 +/- 0.5 in HEAT1 and HEAT2, respectively. Primiparous cows (47.7%) had a higher (p < .01) expression rate compared with multiparous cows (37.2%). Overall pregnancy rate was 37.4% and there was two-way significant interaction between parity and oestrous expression on pregnancy rate (p < .01). Both primiparous (48.1 vs. 35.8%) and multiparous cows (47.4 vs. 28.4%) that expressed oestrus had greater (p < .01) pregnancy rate compared with cows that did not express oestrus. There was no difference in pregnancy rates of HEAT1 and HEAT2 in both primiparous (44.7 vs. 49.5%) and multiparous cows (47.2 vs. 47.6%). Pregnancy rate was not influenced (p = .21) by milk production (high or low) in both primiparous (47.6 vs. 48.6%) and multiparous (54.9 vs. 42.1%) cows that expressed oestrus, respectively. In conclusion, cows showing oestrus before or after second GnRH of the Ovsynch protocol had greater pregnancy rate than cows not showing oestrus.Publication President oral presentation pick: Phenotypic plasticity of heat tolerance in beef cattle(Oxford Univ Press, 2020-11-01) Mateescu, Raluca G.; Davila, Kaitlyn M. Sarlo; Dikmen, Serdal; Nunez, Andrea; Rodriguez, Eduardo; Oltenacu, Pascal; DİKMEN, SERDAL; Veteriner Fakültesi; 0000-0002-5611-4993; A-5731-2018Publication Chick quality assesment: Visual scoring or chick length?(Elsevier, 2008-01-01) Petek, Metin; Orman, Abdulkadir; Alpay, Fazlı; Dikmen, Serdal; PETEK, METİN; ORMAN, ABDÜLKADİR; ALPAY, FAZLI; DİKMEN, SERDAL; Uludağ Üniversitesi; 0000-0001-9138-4422; 0000-0002-5611-4993; A-5731-2018; JPK-5654-2023; AAG-9134-2021; AAE-4562-2019Publication Prlr and pcca variants associated with hair length in brangus heifers(Oxford Univ Press Inc, 2020-11-01) Davila, Kaitlyn M. Sarlo; Howell, Alyssa; Nunez, Andrea; Orelien, Arseia; Roe, Victoria; Rodriguez, David; Rodriguez, Eduardo; Dikmen, Serdal; Mateescu, Raluca A.; Dikmen, Serdal; DİKMEN, SERDAL; Ziraat Fakültesi; 0000-0002-5611-4993; A-5731-2018Publication Differences in thermoregulation ability and genetic parameters of skin traits in Angus, Brahman and their Crossbreds(Oxford Univ Press Inc, 2019-12-01) Dikmen, Serdal; Mateescu, Raluca G.; DİKMEN, SERDAL; Veteriner Fakültesi; Hayvan Bilimleri Bölümü; A-5731-2018Publication Impact of brahman genetics on skin histology characteristics with implications for heat tolerance in cattle(Frontiers Media Sa, 2023-05-09) Mateescu, Raluca G. G.; Davila, Kaitlyn M. Sarlo M.; Hernandez, Aakilah S. S.; Andrade, Andrea Nunez; Zayas, Gabriel A. A.; Rodriguez, Eduardo E. E.; Oltenacu, Pascal A. A.; Dikmen, Serdal; DİKMEN, SERDAL; Veteriner Fakültesi; Zootekni Ana Bilim Dalı; A-5731-2018Cattle lose heat predominantly through cutaneous evaporation at the skin-hair coat interface when experiencing heat stress. Sweating ability, sweat gland properties, and hair coat properties are a few of the many variables determining the efficacy of evaporative cooling. Sweating is a significant heat dissipation mechanism responsible for 85% of body heat loss when temperatures rise above 86 degrees F. The purpose of this study was to characterize skin morphological parameters in Angus, Brahman, and their crossbred cattle. Skin samples were taken during the summer of 2017 and 2018 from a total of 319 heifers from six breed groups ranging from 100% Angus to 100% Brahman. Epidermis thickness decreased as the percentage of Brahman genetics increased where the 100% Angus group had a significantly thicker epidermis compared to the 100% Brahman animals. A more extended epidermis layer was identified in Brahman animals due to more pronounced undulations in this skin layer. Breed groups with 75% and 100% Brahman genes were similar and had the largest sweat gland area, indicative of superior resilience to heat stress, compared to breed groups with 50% or lower Brahman genetics. There was a significant linear breed group effect on sweat gland area indicating an increase of 862.0 mu m(2) for every 25% increase in Brahman genetics. Sweat gland length increased as the Brahman percentage increased, while the sweat gland depth showed an opposite trend, decreasing from 100% Angus to 100% Brahman. The number of sebaceous glands was highest in 100% Brahman animals which had about 1.77 more sebaceous glands (p < 0.05) per 4.6 mm(2)area. Conversely, the sebaceous gland area was greatest in the 100% Angus group. This study identified significant differences in skin properties related to heat exchange ability between Brahman and Angus cattle. Equally important, these differences are also accompanied by significant levels of variation within each breed, which is indicative that selection for these skin traits would improve the heat exchange ability in beef cattle. Further, selecting beef cattle for these skin traits would lead to increased resilience to heat stress without disrupting production traits.Publication Effects of the bovine SLICK1 mutation in PRLR on sweat gland area, FOXA1 abundance, and global gene expression in skin(Elsevier, 2022-10-18) Sosa, F.; Carmickle, A. T.; Oliveira, L. J.; Sagheer, M.; Saleem, M.; Yu, F. H.; Altman, M. D.; Dikmen, Serdal; Denicol, A. C.; Sonstegard, T. S.; Larson, C. C.; Hansen, P. J.; DİKMEN, SERDAL; Veteriner Fakültesi; Zootekni Ana Bilim Dalı; A-5731-2018The SLICK1 mutation in the prolactin receptor (PRLR) results in a short-hair coat and increased ability to regulate body temperature during heat stress. It is unclear whether the mutation affects capacity for sweating. The objective of this observational study was to evaluate whether the SLICK1 mutation in PRLR alters characteristics of skin related to sweat gland abundance or function. Skin biopsies from 31 Holstein heifers, including 14 wild-type (SL-/-) and 17 heterozygous slick (SL+/-), were subjected to histological analysis to determine the percent of the surface area of skin sections that are occupied by sweat glands. We detected no effect of genotype on this variable. Immunohistochemical analysis of the forkhead transcription factor A1 (FOXA1), a protein essential for sweating in mice, from 6 SL-/- and 6 SL+/- heifers indicated twice as much FOXA1 in sweat glandular epithelia of SL+/heifers as in SL-/- heifers. Results from RNA sequencing of skin biopsies from 5 SL-/- and 7 SL+/- heifers revealed few genes that were differentially expressed and none that have been associated with sweat gland development or function. In conclusion, results do not support the idea that the SLICK1 mutation changes the abundance of sweat glands in skin, but do show that functional properties of sweat glands, as indicated by increased abundance of immunoreactive FOXA1, are modified by inheritance of the mutation in PRLR.