Ahmet Gümen

ORCID: 0000-0002-3607-4365
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About
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Research Areas
  • Reproductive Physiology in Livestock
  • Genetic and phenotypic traits in livestock
  • Reproductive Biology and Fertility
  • Ruminant Nutrition and Digestive Physiology
  • Effects of Environmental Stressors on Livestock
  • Reproductive System and Pregnancy
  • Animal Genetics and Reproduction
  • Milk Quality and Mastitis in Dairy Cows
  • Ovarian function and disorders
  • Public Administration and Governance
  • Animal health and immunology
  • Reproductive biology and impacts on aquatic species
  • Protein Hydrolysis and Bioactive Peptides
  • Immune Cell Function and Interaction
  • Immune Response and Inflammation
  • Turkish Urban and Social Issues
  • Livestock Management and Performance Improvement
  • Cultural and Sociopolitical Studies
  • Tryptophan and brain disorders
  • Estrogen and related hormone effects
  • Animal Behavior and Welfare Studies
  • Coccidia and coccidiosis research
  • Ovarian cancer diagnosis and treatment
  • Growth Hormone and Insulin-like Growth Factors
  • Endometriosis Research and Treatment

Bursa Uludağ Üni̇versi̇tesi̇
2013-2024

University of Wisconsin–Madison
2002-2009

St. Petersburg Institute of Bioregulation and Gerontology
2006

University of Minnesota
2003

At approximately 8.5 mm in diameter, the future dominant follicle is "selected" for continued growth cattle. In present study, cows were treated with a gonadotropin-releasing hormone receptor antagonist, acyline, just before selection (near 7.8 mm) to investigate role of LH changing mRNA concentrations during follicle. The ovaries containing expected (EDF; first largest follicle) and subordinate (ESF) removed after 12 or 24 h treatment. Real-time PCR was used determine concentrations. ELISA...

10.1095/biolreprod.110.085274 article EN Biology of Reproduction 2010-10-20

Many mammals, including cattle, can develop ovarian follicular cysts, but the physiological mechanisms leading to this condition remain undefined. We hypothesized that cysts because estradiol will induce a GnRH/LH surge on one occasion progesterone exposure is required before another be induced by estradiol. In experiment 1, 14 cows were synchronized with an intravaginal insert (IPI) for 7 days, and prostaglandin F2α was given day of IPI removal. Estradiol benzoate (EB; 5 mg i.m.) 3 days...

10.1095/biolreprod66.6.1689 article EN Biology of Reproduction 2002-06-01

In this report, multiple abnormalities (bilateral ovarian cysts, cystic endometrial hyperplasia and pyometra (CEH-P), mammary adenoma, fibrosarcoma cystic-papillary adenocarcinoma) identified in a queen continually administered medroxyprogesterone acetate (MPA) for 9 years are described. An 11-year-old domestic shorthair intact was presented reduced appetite, polyuria, polydipsia, abdominal distension, mass. Pyometra diagnosed based upon clinical, ultrasonographic radiographic examinations....

10.1016/j.jfms.2008.10.006 article EN Journal of Feline Medicine and Surgery 2008-12-06

Contents The aim of this study was to compare pregnancy per artificial insemination (P/ AI ) after timed with sex‐sorted sperm ( SS or conventional semen CS in lactating dairy cows. Cyclic cows (n = 302) were synchronized by O vsynch and randomly assigned into two groups at the time . Cows a follicle size between 12 18 mm clear vaginal discharge inseminated either frozen‐thawed 148) 154) same bull. A shallow uterine performed horn ipsilateral side probable impending ovulation. Pregnancy on D...

10.1111/rda.12280 article EN Reproduction in Domestic Animals 2014-01-28

Abstract. The relationship between the index values used to evaluate genomic value and essential markers such as casein genes provides important information at herd level. Therefore, this study aimed determine association gene genotypes indices of genetic merit in Holstein Friesian cattle. A total 805 cows were genotyped using Affymetrix® Axiom® array system. We data composed performance (TPI) net (NM) well predicted transmitting abilities (PTAs) indices, including milk, fat, fat percentage,...

10.5194/aab-67-61-2024 article EN cc-by Archives animal breeding/Archiv für Tierzucht 2024-02-14

The pathophysiology underlying follicular cysts appears to be lack of an estradiol (E2)-induced GnRH/LH surge due hypothalamic insensitivity E2. In addition, progesterone (P4) can cause animals with resume normal cyclicity and responsiveness We postulated that may a pathological manifestation physiological state cows, possibly other species, go through during the estrous cycle but rise in P4 following ovulation induces them back Based on this hypothesis, we expected removal ovary containing...

10.1530/rep.1.00653 article EN Reproduction 2005-05-27

Contents The objective was to compare pregnancy per artificial insemination (P/AI) with conventional (CS) or sex‐sorted semen (SS) in dairy cows subjected one of the three timed AI protocols. Cows ( n = 356) were randomly assigned synchronization Ovsynch (OVS), Presynch–Ovsynch (PO) Double‐Ovsynch (DO) and inseminated on Day 77 ± 3 postpartum either frozen‐thawed SS 182) CS 184) same bull. More cyclic at beginning breeding increased p < 0.01) presynchronization it greater for DO than PO...

10.1111/rda.13363 article EN Reproduction in Domestic Animals 2018-10-16

The aims of this study were to determine the factors that affect follicle size at time artificial insemination (AI) and detect relationship between ovulatory AI pregnancy rate in dairy cows. A total 1428 measurements obtained from Holstein-Friesian (HF) Swedish Red (SR) cows inseminated with fixed-timed protocols used study. Follicle was affected by breed (P = 0.0001), milk production 0.01), parity 0.05), season 0.04). greater 0.0001) HF (15.55 mm) than SR (14.88 mm). Multiparous had larger...

10.3906/vet-1506-59 article EN TURKISH JOURNAL OF VETERINARY AND ANIMAL SCIENCES 2016-01-01

The A2 milk marker is gaining popularity worldwide; thus, many farms plan to convert their dairy cattle herds the A2A2 genotype. Variation in beta-casein genotypes needs be monitored large populations. Therefore we aimed evaluate genotypic distributions, population genetics, and diversity parameters Holstein-Friesian cows. A total of 1200 were genotyped using Affymetrix® Axiom® array system. We performed an association analysis regarding CSN2 phenotypic traits, including lactation test-day...

10.1080/10495398.2023.2267614 article EN cc-by-nc Animal Biotechnology 2023-10-13
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