
Ibrahim DoganBursa Uludağ Üni̇versi̇tesi̇ · Department of Reproduction and Artificial Insemination
Ibrahim Dogan
Doctor of Veterinary Medicine
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48
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Introduction
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September 1989 - present
Publications
Publications (48)
One of the most basic goals in horse breeding is to have one live foal born per year from each breeding
mare. Although it may seem like a simple goal, physiological conditions such as long gestation period and
limited breeding season in mares make it difficult to achieve this goal. Although techniques developed for
the control and monitoring of...
The KISS1 gene, which activates G protein-coupled receptor-54 (GPR54) and plays a crucial role in the neuroendocrine regulation of GnRH secretion, is known to encode a family of neuropeptides called kisspeptins. Therefore, the KISS1 gene is thought to be associated with sexual maturity, offspring development, and estrus. The g.2124T>A polymorphism...
A number of complex interrelated biological mechanisms exist between the equine embryo and the uterus. In
mares, fertilization occurs between the ampulla and isthmus sections of the oviduct, and 5-6 days after ovulation,
the embryo crosses the oviduct and comes to the uterus. Prostaglandin E2 and prostaglandin F2α secreted by
the embryo allow th...
Comparison of the effect of eCG and hCG treatment on the fertility in Saanen goats during the breeding season I Dogan, MB Toker, A Aktar, MM Yilmaz, T Cimen, D Udum This work is licensed under a Creative Commons Attribution-NonCommercial 4.0. To cite this article: Dogan, I., Toker, M., Aktar, A., Yilmaz, M., Cimen, T., & Udum, D. (2024). Comparison...
This study aimed to compare the effects of a single dose of GnRH or hCG administered at the beginning of the short-term oestrus synchronization protocol on ≥4 mm diameter follicles in Saanen goats during the breeding season. The goats es-trus cycles were synchronized with intravaginal sponges containing 60 mg of medroxy-progesterone acetate for fiv...
Horses are seasonally polyestrous animals, making it extremely important for broodmares to become pregnant, especially at the
beginning of the breeding season. Imaging of the ovaries by ultrasonography in mares has shed light on the understanding of
follicular dynamics. Follicle waves occur periodically in the ovaries of mares, but today this mech...
This study aimed to compare the effect of hCG administered at 24 or 36 h following a short-term estrus synchronization treatment on the ovulation time and estrus parameters in non-lactating Saanen goats during the breeding season. The estrous cycles of does were synchronized with an intravaginal sponge containing 60 mg of medroxyprogesterone acetat...
Despite there have been many experiments conducted about antioxidants, the best sole or combination use of antioxidants to include as a standard ingredient to freezing extenders is yet to be found. This study was designed to investigate the different doses of methionine (2.5 and 5 mM), cysteine (1 and 2 mM), and butylated hydroxytoluene (BHT) (1 an...
This study aimed to compare the effect of hCG or GnRH administered 36 h following a short-term es-trus synchronization treatment on the ovulation time and pregnancy rates of Merino ewes during the breeding season. The estrus cycles of ewes were synchronized with an intravaginal sponge containing 60 mg of medroxyprogesterone acetate for 6 days, and...
The objective of this study was to compare the effect on the ovulation time and estrus parameters of a
GnRH agonist (buserelin acetate) administered 24 or 36 h following a short-term estrus induction and synchronization
treatment in non-lactating Saanen goats during the transitional period. Goats received 20 mg FGA sponges for 6 days
plus 300 IU eC...
We describe and compare the ovarian follicular dynamics and plasma progesterone concentrations in nulliparous Saanen does during the breeding and non-breeding seasons. Does were monitored daily using transrectal ovarian ul-trasonography for a full oestrous cycle in the breeding (n = 19) and a 21-day period in the non-breeding season (n = 20). At tw...
This study is aimed at describing the ovarian follicular dynamics, corpora lutea and their hormonal control during early pregnancy in Saanen goats. The ovaries of pregnant goats (n = 10) were monitored daily for follicles (≥ 2 mm) and corpora lutea by transrectal ultrasound over the 35 days after mating. Blood samples were collected by jugular veni...
The efficiency of medroxyprogesterone acetate (MAP) sponges or norgestomet ear implants (half or entire) for synchronizing and inducing the estrous cycle in non-lactating Kivircik ewes was investigated during the natural non-breeding period. Ewes were treated for 11 days either with 60 mg MAP sponges (group 1, n=27) or with 1.5 mg norgestomet (grou...
The objective of this study was to evaluate the duration of four progestagen treatments on estrous synchronization and pregnancy rate in non-lactating Anatolian black goats during the natural breeding season. All does were divided into four groups according to progestagen treatment duration using intravaginal sponges (60 mg MAP): group 1, 13 days (...
The objective of the present study was to investigate the effect of different freezing rates on post-thaw sperm motility, acrosome defect, and sperm chromatin structure and apoptotic activity in ram semen. Collected semen was diluted at 1:5 (semen/extender) with Bioxel® (IMV technologies France) at 30° and then cooled to 5° within 1h. Cooled semen...
The objective of the present study was to investigate the effect of different freezing rates on post-thaw sperm motility, acrosome defect, and sperm chromatin structure and apoptotic activity in ram semen. Collected semen was diluted at 1:5 (semen/extender) with Bioxel® (IMV technologies France) at 30ºC and then cooled to 5ºC within 1h. Cooled seme...
The objective of this study was to investigate aspartate-amino-transferase (AST), γ-glutamyl-transferase
(GGT), alkaline phosphatase (ALP), lactate-dehydrogenase (LDH) and acid phosphatase (AcP) activities and
semen parameters (volume, pH, concentration, total sperm number (TSN), progressive motility, dead sperm,
total morphological defect (TMD) an...
The purpose of this study was to determine copper, iron, lead, zinc and cadmium concentration in the semen of Arabian stallions during breeding season (March-May), and their correlations with the semen parameters. A total of 21 ejaculates were obtained from 7 stallions and were subjected to routine semen and trace elements analyses. The semen param...
The efficiency of cronolone sponges in combination with either pregnant mare serum gonadotrophin (PMSG) or cloprostenol (PGF2alpha) for inducing and synchronizing the estrous cycle in Turkish Saanen does was investigated during the transition from non-breeding to breeding season. All does (n = 80) were treated with 20 mg cronolone sponges for 11 da...
The objective of this study was to evaluate the duration of three progestagen treatments for estrous synchronization in lactating Turkish Saanen goats during the transitional period from anestrous. All does (n=60) were divided into three equal groups and the estrous period of the does was synchronized using intravaginal sponges (20 mg FGA) for eith...
The influence of different extender osmolality levels and the presence of different cryoprotectants on the post- thawed semen's characteristics and post-thawed plasma membrane integrity of ram spermatozoa were studied. Ram semen was frozen with TRIS-egg yolk based extender according to two-step dilution procedures. The final concentrations of the c...
The efficiency of medroxyprogesterone acetate (MAP) sponges in combination with either pregnant mare serum gonadotrophin (PMSG) or cloprostenol (PGF 2α ) for inducing and synchronizing the estrous cycle in non-lactating Kivircik ewes was investigated during the natural non-breeding season. All ewes ( n = 69) were treated with 60 mg MAP sponges for...
The aim of the study was to evaluate the effect of the addition of 20% bull seminal plasma to semen extenders on post-thaw sperm motility, morphology, and fertility. Two Merino rams at 3-5 years of age, 43 ewes, and one Holstein bull were used. Fourteen ejaculates were collected by the use of an artificial vagina, twice a day, at 60 min interval. S...
The objective of the present study was to evaluate some semen characteristics in Saanen bucks during the transition period. A total of 60 ejaculates were obtained from 6 bucks and was subjected to routine semen analysis. In general, all studied semen parameters were similar to the other breeds. Abnormal sperm cells positively correlated with dead s...
The objective of this study was to investigate the effect of low temperature thawing and post-thaw cold shock application on sperm motility, as well as acrosomal and plasma membrane integrities of cryopreserved bull semen. Frozen semen was thawed in a water bath at 5-7°C for 30, 60 or 90 s (low thawed groups), cold shocked (at 5-7°C for 30, 60 or 9...
Results indicate that glucose or fructose can be used as an energy source for the Tris-citric acid extender for the short time storage of rabbit semen. According to time differences (0, 24, 48, 72 h) there were statistically significant (P<0.05) differences among motility, dead sperm cells and morphological (head, mid, acrosome) characteristics exc...
The efficiency of medroxyprogesterone acetate (MAP) and fluorogestone acetate (FGA) sponges with or without PGF 2α (cloprostenol) for synchronizing estrous in non-lactating does was investigated during the natural breeding season. Does were treated for 11 days with 60 mg MAP ( n = 38) or 40 mg FGA ( n = 32) sponges. All does also received intramusc...
The aim of the present study was to assess the relationships between sperm membrane integrity, evaluated by the hypo-osmotic swelling (HOS) and water tests, and sperm quality parameters (percentage of dead, motile and abnormal spermatozoa) in goat bucks. For that purpose, a total of 60 fresh ejaculates from 6 Saanen bucks were evaluated. The mean p...
The objective of this study was to compare the fertility levels of goats inseminated with fresh semen and buck semen diluted with three different extenders. The fertility rates of goats inseminated in spontaneous oestrus during breeding season were found 66.6% (12/18), 60.8% (28/46), 44.4% (12/27) and 48.7% (20/41) for fresh semen, Laiciphos 488-eg...
Repeat breeder syndrome is considered as one of the most important causes of infertility in dairy cattle. Deficiencies of various blood biochemical constituents are the major causes for repeat breeder syndrome (Dutta et al., 1991). This study was carried out to examine some plasma biochemical constituents on day 0 (estrus) and 10 (diestrus) of the...
A total of 40 ejaculates were obtained from 18 mature dogs and was subjected to routine semen analysis and sperm plasma membrane integrity. There were high positive correlations between swollen tail spermatozoa and motility, and swollen tail spermatozoa and eosin unstained spermatozoa. However, comparatively the percentage of head and mid piece abn...
________________________________________________________________________________ Abstract The efficiency of medroxyprogesterone acetate (MAP) and fluorogestone acetate (FGA) sponges for synchronizing oestrus in lactating Saanen goats was investigated during the transition from non-breeding to natural breeding season. Does were treated for 11 days w...
The objective of this study was to evaluate effect of different thawing procedure to Hypo-Osmotic Swelling Test (HOST), motility and morphology of bull semen. Straw (0.25 ml) frozen semen from 4 Holstein bulls was used in this study. Post-thaw motility, morphology and hypo-osmotic swelling test (HOST) were carried out at 37°C for 30 sec, 50°C for 1...
The aim of this study is to investigate the some spermatological characteristics of New Zealand White rabbit bucks. Ten New Zealand White males, aged 12-18 months, were used as materials. Five ejaculates were collected from each buck on every other day by means of artificial vagina. The averages of ejaculate volume, pH, spermatozoa concentration, m...
The aim of this study is to investigate the some spermatological characteristics of New Zealand White
rabbit bucks. Ten New Zealand White males, aged 12-18 months, were used as materials. Five ejaculates were collected from each buck on every other day by means of artificial vagina. The averages of ejaculate volume, pH, spermatozoa concentration, m...
The aim of this study was investigated of freezability of ram semen during the transition from nonbreeding
to the natural breeding and breeding season. In this study, collected ram semen was diluted Tris-egg yolk
extender in 1:1 ratio finally including 5% glycerol and frozen in 0.25 ml straws both during the transition from nonbreeding to the natur...
This study was designed to assess effectiveness of different staining methods, Eosin-nigrosin (EN),
Giemsa and double staining method Eosin-nigrosin combined with Giemsa (EN-G), to detect dead spermatozoa,
defected acrosome rates (AB), Other Morphological Defect (DMB) and Total Morphological Defect (TMB) in fresh Saanen semen. The percentages of sp...
Some blood biochemical parameters were found nonsignificant between fertile and repeat breeding cows, which were kept under the good management conditions, contrary to the findings of other investigators. This could be due to different animal breed, health, nutritional and management conditions. The results of this study showed that metabolic profi...
The objective of this study was to compare the developmental ability of embryos in 4 different media, CR 1aa, modified CR2, BCEM-g and TCM-199. Bovine oocytes were matured and then fertilized in vitro. A total of 915 oocytes were used for fertilization, 681 (74%) of which cleaved. The 2-cell embryos were divided into 4 groups, and cultured in 1 of...
This study consisted of comparative histopathological examination of endometrium in repeat breeder as well as fertile cows. In fertile and repeat breeder cows, hyperaemia, edema, and focal haemorrhages with the desquamated epithelial cells in gland lumens were observed. Subclinical endometritis was determined in 8 repeat breeder cows (53.33%). infl...
Recently the production of rainbow trout has been increased in Turkey. 70 rainbow trout (Oncorhyncus mykiss) have been used as research materials in a fish farm near Bozöyük. They were divided into 7 groups. One was control, the next three was only vitamin E added group, which had 50, 100 150 mg/kg Vitamin E in their diet, the other three groups ha...
In this study, the purpose was to determine agglutination reaction in cervical mucus and serum samples of 50 repeat breeder cow and heifers on which Cervical Mucus Penetration Test was applied, to investigate the effect of mentioned situation on sperm motility and migration values. Frozen bull sperm used for artificial insemination and never used f...
In this study, the purpose was to determine agglutination reaction in cervical mucus and serum samples
of 50 repeat breeder cow and heifers on which Cervical Mucus Penetration Test was applied, to investigate the
effect of mentioned situation on sperm motility and migration values. Frozen bull sperm used for artificial
insemination and never used f...
In the first step, semen samples were diluted with Tris+Citric acid+Fructose+Egg yolk and Sadium citrate+Egg yolk diluents and were frozen in liquid nitrogen vapour. In the second step. 120 Merino ewes were synchronised with sponges, which contained flourogestone acetate, for 14 days. PMSG was injected into the ewes on the withdrawal day. Ewes were...
Recently the production of rainbow trout has been increased in Turkey. 70 rainbow trout (Oncorhyncus mykiss) have been used as research materials in a fish farm near Bozöyük. They were divided into 7 groups. One was control, the next three was only vitamin E added group, which had 50, 100 150 mg/kg Vitamin E in their diet, the other three groups ha...
In this study, serum samples from 75 repeat breeder cows were examined by the Microscopic Agglutination Test (MAT) for Leptospira pomona, L. canicola, L. icterohaemorragiae, L. grippotyphosa, L. hardjo and L. hebdomadis antibodies. A titer of 1/100 or more was considered positive for MAT. of the samples examined, 1 was positive against L. hardjo ,...
In the present study, a total of 45 cervical mucus samples obtained from 30 fertil and 15 repeat breeder cowe was studied. Fifteen of 30 fertil cows were injected wiyh prostaglandin F2 alfa.