Hamid Ghasemzadeh-nava
Departmeny of Theriogenology, Faculty of Veterinary Medicine, University of Tehran, Tehran, Iran
[ 1 ] - Investigation of the effect of progesterone (Cue-MateTM) administration on ovulation induction in photostimulated anestrus mares
BACKGROUND: In mare, different methods of earlier cyclicity induction and hastening first ovulation of the year have been reported. OBJECTIVES: The goal of present study was to investigate the effect of progesterone (Cue-mate®) on synchronization and acceleration the first ovulation of the year in winter anestrous mares under artificial lighting system. METHODS: After detection of anestrus mare...
[ 2 ] - Isolation of bovine spermatogonial cells and co-culture with prepubertal sertoli cells in the presence of colony stimulating factor-1
BACKGROUND: Spermatogonial stem cells (SSCs) are infrequentself-renewing cells among the type A spermatogoniawithin the seminiferous tubules and are the basis of spermatogenesisin mammalian testis. An adequate number of SSCs is aprimary requirement for the study of their behavior, regulation, andfurther biomanipulation. OBJECTIVES: In this paper, we studiedthe development of the primary co-cult...
[ 3 ] - Control of red deer (Cervus elaphus) stag domination in rut season by estrus synchronization
BACKGROUND: Inbreeding is one of the major problems of small size herds of red deer in refuge wildlife parks. OBJECTIVES: The aim of the present study was to use estrus synchronization technique in red deer (Cervus elaphus) based on natural mating to control the dominancy and social rank of stags and inbreeding. METHODS: In this study, hinds (n=6) were captured and caged at breeding season (ear...
[ 4 ] - Effects of dietary polyunsaturated fatty acids on ovarian function and prostaglandin secretion in lactating dairy cows
As lactating cows in severe negative energy balance have poor reproductive performance, the effect of dietary fat supplementation (fish oil, soybean oil) on PGFM secretion, ovarian function and blood metabolites is investigated. In this experiment, the effects of dietary polyunsaturated fatty acids on plasma metabolites, ovarian function and prostaglandin secretion of 20 primiparous Holstein co...
[ 5 ] - Effect of Administration of an Opioid Antagonist (Naloxane) to Treat Ovarian Cysts in Dairy Cows
The role of stress in the pathogenesis of ovarian cysts is believed to be mediated by the discharge of endogenous cortisol, which inhibits LH release. Endogenous opioid peptides are involved in many responses to stress. Therefore, the aim of this study was to determine the effect of epidural administration of Naloxone (NX) on cystic regression and follicle development leading to normal oestrus ...
[ 6 ] - ارزیابی باروری حاصل از درمان با پروژسترون و GnRH در گاوهای شیری
تنش گرمایی سبب کاهش باروری گله‌های گاو شیری و اعمال خسارت بر این صنعت می‌شود. استفاده از هورمون‌ها پس از تلقیح مصنوعی یکی از راهکارهای غلبه بر اثرات منفی ناشی از این پدیده می‌باشد.هدف از انجام این مطالعه مقایسه بین تاثیر تجویز پروژسترون (به فرم سیدر) و GnRH متعاقب تلقیح مصنوعی بر میزان آبستنی گاوهای شیری تحت تنش گرمایی خفیف بود. گاوها پس ازفحل یابی و تلقیح بصورت کاملاً تصادفی در سه گروه قرار ...
[ 7 ] - تاثیر تجویز دو دوره متفاوت درمان با سیدر روی میزان آبستنی تلقیح دوم گاوهای شیری واکل
واکلی یک سندروم محسوب می شود که علل مختلفی در بروز آن نقش دارند. عدم کارآیی بافت لوتئال یک علت شناخته شده در مرگ رویان محسوب می شود. در این مطالعه تاثیر تجویز سیدر در دو پریود مختلف در گاوهای واکل روی نرخ آبستنی در تلقیح متعاقب درمان (تلقیح دوم) و نیز نرخ آبستنی مجموع دو تلقیح اول و دوم بررسی گردید. گاوهای واکل شکم اول تا پنجم پس از زایش در طرح که حداقل سه و حداکثر شش تلقیح ناموفق داشته اند به...
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