نتایج جستجو برای: reproductive cycle
تعداد نتایج: 363367 فیلتر نتایج به سال:
evaluation of the cyclic changes in mare reproductive system comparing biopsy and endoscopic methods
during a period of one year, reproductive status of twenty one healthy maiden and parous turkaman cross bred mares were studied during breeding and non breeding seasons the reproductive health and fertility of the mares ranging 3 -13 years of age were confirmed by taking history, performing rectal palpation and studying endometrial culture, cytology and histology. stages of the oestrous cycles ...
Reproductive isolation (RI) plays an important role for speciation, but assessing reproductive barriers at all life-cycle stages remains challenging. In plants, most studies addressing the topic have been focusing on herbs with short generation times. The present study attempted to quantify several reproductive barriers between a hybridizing species pair of long-lived woody rhododendrons. Consi...
Reproductive cessation is perhaps the earliest aging phenotype that humans experience. Similarly, reproduction of Caenorhabditis elegans ceases in mid-adulthood. Although somatic aging has been studied in both worms and humans, mechanisms regulating reproductive aging are not yet understood. Here, we show that TGF-β Sma/Mab and Insulin/IGF-1 signaling regulate C. elegans reproductive aging by m...
In sturgeons, Primordial Germ Cells originate from the vegetal pole of the egg. They migrate toward genital ridges during developmental stages and finally differentiate into gametes (the only cells that transmit genetic information). In this study, the cells were isolated from the place of migration of primordial germ cells in Huso huso’s larvae during two stages before and after absorption of ...
Objective Polycystic ovary syndrome is a frequent condition in women of reproductive age with prevalence rate of 5-10%. This study purposed to determine the relationship between polycystic ovary syndrome and the outcome of assisted reproductive treatment (ART) cycle in Tehran, Iran. MaterialsAndMethods In this historical cohort study, 996 infertile women were included in the study between Janua...
Overall, 531 dairy cows were inseminated with the aim to study their reproductive performance following administration of GnRH analogue on different days of estrous cycle with different doses. These cows were divided into six treatment and one control group. Depending upon different treatment groups, Buserelin acetate was injected at a dose of 10.5 µg or 21.0 µg on different days (0, 5 or 12) o...
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