Stanimir Yotov

Stanimir Yotov
Trakia University · Department of Obstetrics, Reproduction and Reproductive Disorders

DVM, MS, PhD

About

58
Publications
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262
Citations

Publications

Publications (58)
Article
Full-text available
This study evaluates the phytochemical composition and ability of herbal preparation AyuFertin, supplemented shortly after calving, to resume the cyclic ovarian activity in postpartum Bulgarian Murrah buffaloes. In total, 13 healthy Bulgarian Murrah buffaloes at the age of 4–10 years, calved in March–April 2019 were involved in the experiment. Seve...
Article
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In this study the individual profiles of seminal plasma proteins (SPP) in rams of three breeds – Merino, Pleven Blackhead and Ile de France - were analysed. The study was carried out with three rams at 3, 6 and 10 years of age, grown and fed under similar conditions. Eighteen ejaculates (6 ejaculates from each ram) were evaluated by Sperm Class Ana...
Article
Full-text available
Recently, more evidences of epigenetic impact on the male fertility, particularly on sperm DNA methylation have been reported. Data related to this issue in livestock males is still limited. The present study analyzed the DNA methylation status of the important gene for spermatogenesis, SIRT1, in ram sperm and its correspondence with semen quality...
Article
The maintenance of high vitality and motility of ram's spermatozoa during storage at low temperatures has a crucial role for successful fertilization. This study evaluates the effect of the natural antioxidant oregonin on ram semen quality, stored at 5 °C for 48 h. Еighteen ejaculates (three repetitions for 6 ejaculates) from three local breed rams...
Article
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The aim of this study was to investigate basic biometric indicators, testicular parameters, semen characteristics and testicular parenchymal echogenicity in peripubertal and postpubertal Pleven Blackhead rams. The animals were separated in two groups: group I (peripubertal rams, aged 5 - 8 months; n=8) and group II (postpubertal rams, aged 14 - 22...
Article
The aim of the current study was to determine the gestational age in goats through measurement of some fetal and uterine structures. Twenty‐four pregnant Bulgarian local goats were submitted to ultrasound fetometry by transrectal and transabdominal approaches. Ultrasound measurement of studied parameters were done at 7‐day intervals during the firs...
Article
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Current study aimed to investigate the influence of melatonin treatment on puberty onset in buffalo heifers from Bulgarian Murrah breed. The experiment was carried out with еleven clinically healthy pre-pubertal Bulgarian Murrah buffalo heifers alloted in two groups – control (non treated, n=6) and experimental (melatonin-treated, n=5). According t...
Article
Contents This study was designed to evaluate the dominant follicles development and the estradiol‐17β concentrations in non‐ovulating and ovulating post‐partum buffaloes. Sixteen Bulgarian Murrah buffaloes were submitted to transrectal ultrasonographic examination from the 1st post‐partum day until day 50, 3 days apart. The follicular diameter of t...
Article
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The aim of the present research was to evaluate the potential of blood progesterone (P4) analysis for determination of puberty onset in Bulgarian Murrah buffalo heifers. The experiment was conducted with 13 clinically healthy buffalo heifers from the Bulgarian Murrah breed, at 9 to 20 months of age. Blood samples were collected from all animals and...
Conference Paper
P 265 | Evaluati on of the pregnancy status in Bulgarian Murrah buff aloes a[ er hormonal treatment during the early postpartum period S Yo t o v 1 ; A Atanasov 1 ; Y Ilieva 2 1 Department of Obstetrics, Reproducti on and Reproductive Disorders, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria ; 2 Agricultural Institute,...
Conference Paper
P 116 | Determination of the gestational age of the fetus in Bulgarian local goats by ultrasonographic measurement of some uterine and fetal parameters M Karadaev 1 ; I Fasulkov 1 ; S Yo t o v 1 ; S Atanasova 2 ; N Vasilev 1 1 Department of Obstetrics, Reproduction and Reproductive Disorders, Faculty of Veterinary Medicine, Trakia University, Sta...
Article
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Objective: To determine the pregnancy rate (PR) in goats with natural and synchronized estrus after artificial insemination (AI) by frozen semen during breeding season. Methods: The experiment was carried out with 89 Bulgarian White milk goats divided as follows: group I (n = 54) animals with natural estrus (NE), allocated in two subgroups treated...
Article
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Yotov, S., A. Atanasov, M. Karadaev, L. Dimova & D. Velislavova, 2016. Pregnancy rate in dry and lactating goats after estrus synchronisation with artificial insemination and natural breeding (a field study). Bulg. J. Vet. Med., 19, No 3, 218–223. The objective of this study was to determine the pregnancy rate in dry and lactating goats after estru...
Article
Full-text available
This study was designed to evaluate the dominant follicles develop-ment and the estradiol-17b concentrations in non-ovulating and ovulating postpartum buffaloes. Sixteen Bulgarian Murrah buffaloes were examined by ultrasound from the 1st postpartum day until Day 50, 3 days apart. The follicular diameters and the ovulations were recorded. The animals...
Article
Full-text available
The aim of the present study was to determine the influence of breed, age, season, mating, pregnancy, progestin contraceptive treatment and the onset time of the disease after the last heat on the incidence and epidemiology of canine pyometra in Bulgaria. The investigation included 217 bitches suffering from pyometra. We found that the disorder was...
Article
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The aim of this study was to evaluate the effect of semen extender with soybean lecithin and/or low concentration of glycerol on the quality of goat chilled-stored semen. After collection the ejaculates were divided in three equal parts, diluted with Tris-fructose-citric acid (TFC) extender containing 1.5% soybean lecithin (SL), 1.5% soybean lecith...
Article
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Objective: To investigate some blood biochemical parameters in anoestrous dairy cows with cystic ovarian follicles (COF) during the first two months post partum and the effect of hCG-PGF2α -GnRH treatment on their reproductive response. Methods: The investigation was performed on 20 lactating Holstein cows, divided into two groups: control group (n...
Article
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The aim of the present study was to determine follicle development and resumption of ovarian activity in Bulgarian Murrah buffaloes by transrectal ultrasonographic monitoring of the ovaries during the first 50 days after after calving throughout the breeding season. The investigation included 18 clinically healthy Bulgarian Murrah buffaloes divided...
Article
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Objective: To determine the possibilities for induction of ovarian activity in Bulgarian Murrah buffaloes by hormonal treatment in the early postpartum period. Methods: Twenty six clinically healthy animals, weighing 480-520 kg, 3-5 years of age, with normal parturition, signs of endometritis during the entire experimental period were divided into...
Article
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The aim of the present study was to investigate the pattern of luteal activity in Bulgarian Murrah buffaloes during the first 50 postpartum days by blood progesterone analysis and ultrasonographic corpus luteum detection and its effect on reproductive performance of animals. The study was conducted with 15 clinically healthy Bulgarian Murrah buffal...
Article
Full-text available
The aim of the present study was to investigate the pattern of luteal activity in Bulgarian Murrah buffaloes during the first 50 postpartum days by blood progesterone analysis and ultrasonographic corpus luteum detection and its effect on reproductive performance of animals. The study was conducted with 15 clinically healthy Bulgarian Murrah buffal...
Article
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The purpose of this study was to investigate the potential of ultrasonography for visualization of teats in goats using different techniques. Thirty clinically healthy Bulgarian Dairy White goats, aged 3-7 years, weighing 45-60 kg were studied. They were between the first and third months of lactation and were reared under an identical production...
Article
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The purpose of the present study was to investigate the clinical signs of estrus and conception rates after synchronization of ovulation in Bulgarian Murrah buffaloes depending on ovarian structures. Sixty buffaloes age between 4-8 years, weighing 550-650 kg with body condition score 3.5 were included in the study: Depending on ovarian structures,...
Article
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Objective: The aim of the present study was to assess therapeutical effect of modified Ovsynch and PRID estrus synchronization protocols in Bulgarian Murrah buffalo with inactive ovaries during the low-breeding season. Methods: The study was carried out in 46 Bulgarian Murrah buffaloes with small inactive ovaries established by two consecutive tran...
Article
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The aim of the present study was to investigate the possibilities for diagnostics of late embryonic and foetal death in different sheep breeds and to determine the effect of gestational stage and the parity. The experiment was performed with 209 Trakia merino; 211 Pleven blackhead and 85 Ile de France sheep. A pregnancy diagnosis was determined by...
Article
The aim of this study was to determine the time taken for complete uterine involution in Bulgarian Murrah buffaloes following normal parturition and oxytocin stimulated milking; and to establish the time course of the change in size of the uterine horns, the cervix and caruncles between parturition and involution by means of ultrasonography. There...
Article
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Yotov, S., A. Atanasov & P. Georgiev, 2011. Determination of foetal sex in buffaloes through a single sonographic examination. Bulg. J. Vet. Med., 14, No 1, 39−44. The goal of the present study was to establish the possibility for determining the foetal sex in buffa-loes through a single sonographic examination. The experiment included 39 female Bu...
Article
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The aim of the study was to investigate changes in plasma haptoglobin (Hp) concentrations during an 18 day long period after a caesarean operation or normal parturition in sheep. The control group included six clinical healthy Pleven Blackhead sheep, 2-5 years old, with eutocia. All of them had a normal labour and a total of 10 lambs were delivered...
Article
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The effect of ejaculation frequency on spermatozoa survival in diluted Pleven Blackhead ram semen was investigated. Thirty-two ejaculates were examined. From each ram 4 ejaculates were collected at 10-min intervals in the morning and in the aft ernoon. Semen parameters, namely, color, density, transparency, volume, concentration, motility, and abno...
Article
The aim of the present study was to investigate the effect of oestrus induction and timed artificial insemination on conception rates in Bulgarian Murrah buffaloes. Fifteen lactating non-primiparous buffaloes weighing 550-650 kg, fed and reared uniformly, were included in the survey. The animals were submitted to transrectal ultrasonography and div...
Article
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A comparative study on the concentration of the enzyme acid phosphatase in seminal plasma in the ejaculates of men, jacks and rams was performed. After the semen collection, the following indicators were established: ejaculate volume, spermatozoa concentration, percentage of motile and pathological spermatozoa. Seminal plasma was separated through...
Article
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A case of hydrometra in a Blackhead Pleven sheep following oestrus synchronization and artificial insemination in the anoestral season is detected. The causes of the disease are discussed, the clinical signs and the echographic findings are described. The haematologi-cal, blood biochemical parameters and progesterone concentration were assayed. The...
Article
The aim of the present study was to examine the possibility of ultrasonography to fetal sex determination in sheep depending on gestational age and fetal position. In our investigation 19 sheep with singleton fetus were included. All animals were submitted to a transabdominal ultrasonography by Aloka SSD 500 Micrus (Aloka Co. Ltd, Tokyo, Japa...
Article
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This study examines the influence of gestational phase and pregnancy type on foetal number in sheep from wool, dairy, and meat breeds. 227 animals of the Trakia Merino breed (n=60), Blackhead Pleven breed (n=105), and Ile de France breed (n=62) were studied using echography. All sheep were tested once between the 20 th and 50 th gestational day by...
Article
The present study investigated the possibility of ultrasound diagnostic for early pregnancy diagnosis in Bulgarian buffalo Murrha breed. 61 animals divided in three groups according to time post insemination (p. i.) were examined: group I: 24 - 30 days p. i. (n = 20); group II: 31-40 days p. i. (n = 22) and group III 41-50 days p. i. (n = 19)...
Article
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Yotov, S., 2007. Determination of the number of fetuses in sheep by means of blood pro-gesterone assay and ultrasonography. Bulg. J. Vet. Med., 10, No 3, 185 −193. The studies were carried out on 45 sheep during the reproductive season. A programmed artificial insemination was performed, after synchronization of the estrus with vaginal sponges Chro...
Article
Objective: The aim of the presented study was to determine accuracy, sensitivity and specificity of transrectal sonography for early pregnancy diagnosis in the ewe. Material and methods: The study was performed on 126 Pleven Black Head sheep. The animals were divided into three groups. Each group consisted of 42 sheep. Synchronization of oestrus wa...
Article
Zusammenfassung Gegenstand und Ziel: Überprüfung der Sensitivität, Spezifität und Genauigkeit der transrektalen sonographischen Frühträchtigkeitsuntersuchung beim Schaf. Material und Methode: Die Untersuchung erfolgte an 126 Schafen der Rasse Pleven Black Head. Die in drei Untersuchungsgruppen (je n = 42) eingeteilten Tiere wurden mittels gestagenh...
Article
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The aim of the present investigation was to determine the species specificity of prostate-specific antigen in the semen of ram, jack and human. A comparative study of undiluted and diluted semen from ejaculates of rams, male donkeys (jacks) and human, was performed. The species specificity of PSA was done with the specific membrane test SERATEC® PS...
Article
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An 11-year-old female German Shepherd dog was presented for investigation of progressive enlargement of the abdomen, periodic bloody discharge from the vulva and rapid exhaustion. Transabdominal ultrasonography and lateral abdominal radiography demonstrated an echogenic formation with anechogenic cavities located cranial to the urinary bladder and...
Article
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An 11-year-old female German Shepherd dog was presented for investigation of progressive enlargement of the abdomen, periodic bloody discharge from the vulva and rapid exhaustion. Transabdominal ultrasonography and lateral abdominal radiography demonstrated an echogenic formation with anechogenic cavities located cranial to the urinary bladder and...
Article
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a INTRODUCTION Canine ovarian tumours are divided into 3 groups depending on their origin; germ cell tumours, sex-cord stromal tumours and epithelial cell tumours 7,10 . Germ cell tumours include dysger-minomas, teratomas and embryonal carcinomas. Stromal tumours include granulosa-theca cell tumours, thecomas and luteomas. Epithelial neoplasms make...
Article
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The study was performed on 50 ewes from the Pleven Blackhead milk sheep breed aged 10�12 months and weighing 40�48 kg in November and December. Prior to the experiment, all animals from the herd were submitted to transabdominal echographic study with Aloka SSD 500 Micrus equipment and 5 MHz linear transducer and pregnant sheep were excluded. The sy...
Article
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The purpose of the study was to follow the reproductive parameters of the mare and the jennet after parturition. The study was performed on eight jennets of a local breed, aged 6-10 years, weighing 250 kg, and on nine mares of pureblood English breed, aged 5-7years and weighing 350 kg. Periodical changes in the ovaries and in the uterus were regist...
Article
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We used 12 inbred boars from the English Large White breed in this study. The animals were reared in individual boxes. Selenium (Se) in the forage was provided from a preparation of Sel-Plex ® (Alltech Inc., USA) to a concentration of 0.3 ppm/kg. Semen for analysis was obtained prior to Sel- Plex ® administration, and by days 50 and 100 after the s...
Article
The purpose of the study was to establish the incidence of early embryonic death among dairy cows. Transrectal ultrasound examination for evaluation of pregnancy in the early period of gestation was used. We equally sought to improve the production in stock breeding farms by reducing the interval between inseminations and the service period. Our st...