جستجوی مقالات مرتبط با کلیدواژه "simmental" در نشریات گروه "دامپزشکی"

Turmeric (Curcuma longa) is a perennial plant belonging to the ginger family. Poor bioavailability of curcumin due to low absorption, fast metabolism and systemic removal as well as low solubility are important problems in optimal use of curcumin. One of the suggestions to improve the bioavailability of curcumin is to use its nanoparticles. It has been found that curcumin has significant antioxidant effects and can improve male reproductive activity. Therefore, the aim of this study was to investigate the effects of adding nanocurcumin to semen extender on the semen quality in fresh and frozen-thawed spermatozoa in dual purpose Simmental bulls (Fleckvieh). Ejaculates were collected from 12 bulls in three repetitions in a period of three months. Each ejaculate was equally divided into three parts for experimental groups (control, nanocurcumin 50 mg/L and nanocurcumin 100 mg/L). Semen was frozen in a two-step dilution method. Sperm parameters including motility, viability, morphology, and membrane integrity were investigated before and after freezing. The results showed that nanocurcumin did not have a positive effect on the quality of fresh sperms while, caused an increase in sperm motility parameters in the 100 mg/L group in thawed semen. Since sperm progressive motility of thawed semen is one of the most important indicators of sperm quality prediction, it is suggested to add 100 mg/L of nanocurcumin to the bull semen extenders and conduct in vitro and in vivo studies to determine the fertility and conception rate in fertilized oocytes and cows inseminated with thawed semen enriched with nanocurcumin.

The aim of this study was to investigate the quality of semen frozen with BoviFree diluent compared to manual and Steridyl in dual-purpose Simmental bulls. Semen samples were collected from 12 bulls (three replicates for each bull and a total of 36 ejaculations) using an artificial vagina and each ejaculation was divided into three equal parts. Freezing was done by two-step dilution method and sperm quality parameters such as viability, motility, morphology and plasma membrane integrity were investigated in fresh and frozen thawed semen. The results showed that all sperm characteristics of semen diluted with manual extender in fresh semen were lower than in other diluents, and this difference was significant in the case of the plasma membrane integrity. Regarding frozen thawed semen, progressive motility and other motility parameters in the group which was frozen with Steridyl diluent was significantly more than the other two groups. There was no significant difference between the group of manual and BoviFree extender. Considering the findings of our research Steridyl has a better performance in terms of sperm motility after freezing than BoviFree and manual, it can be concluded that the Steridyl diluent is more suitable for semen freezing of dual-purpose Simmental bulls than the Bovifree and manual diluent. In addition, the results of this research determined that the diluents based on egg yolk are more suitable for bull semen freezing than the diluents based on soy lecithin.