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تعداد نتایج: 17550479 فیلتر نتایج به سال:
Artificial insemination (AI) involving the placing of frozen-thawed semen directly into the jenny uterine body is associated with very low pregnancy rates. This might be because of an exacerbation of the acute response of the endometrium to sperm, as seen in mares with persistent induced mating endometritis. Pregnancy rates can be increased in such mares, however, by including anti-inflammatory...
Background: Optimal thawing rate is critical for quality and fertilizability of frozen -thawed spermatozoa. Kinetic parameters are the most important factors which are affected by thawing rate so, that have close relation between kinetic parameters and fertility of the spermatozoa. Tris - egg yolk have been widely used for cryopreservation of the buffalo and other species semen. According to ou...
This study was carried out to investigate effects of copper sulphate (CuSO4) additive to semen extenders on sperm parameters: progressive motility, viability, membrane integrity and DNA damage, after semen dilution and cryopreservation. Semen samples of 5 buffalo bulls of 3-5 years old were collected at 5 different occasions during the autumn 2011. A total number of 25 samples were u...
Semen quality and its relationship to fertility are major concern in animal production. The aim of this study was to assess the relationship between frozen thawed sperm characteristics and fertility following in vivo fertility through Artificial Insemination(AI). Semen samples were collected from four buffalo bulls. Semen volume and sperm concentration appeared to be significantly different (P0...
Motility characteristics (assessed subjectively and with computer-assisted semen analysis) and membrane status (after staining with chlortetracycline) of washed and non-washed frozen-thawed ram spermatozoa were evaluated after incubation in buffer and buffer containing autologous whole seminal plasma or one of its two fractions: the pellet of membrane vesicles obtained by ultracentrifugation (a...
the present study is an attempt to investigate the potential impact of inspirational quotes on improving english abstract vocabulary recall. to achieve this goal, a multiple choice language proficiency test of 60 items including vocabulary and grammar component was administered to a sample of 63 second-semester male and female students whose age ranged between 17 to 22 and they were studying en...
Chicken seminal plasma contains a high content of sex steroids including progesterone (P4). According to a published study, in vitro supplementation of P4 to the semen resulted in decreased fertility in the White Leghorn chicken; however, it is not known if increased P4 production in vivo is associated with decreased sperm fertility. Therefore, the aim of the present experiment was to study the...
The objective was to determine the relationship between thawing time and post-thaw temperature when the final temperature of the semen was brought to 40 C. One ejaculate from each of 12 dairy bulls was packaged in .5-ml French straws. Semen in five straws from each ejaculate was thawed in a 35 c water bath for 12 s or 1 min. The straws were then immediately placed in water baths at 0, 10 or 20 ...
A continuous decline in the number and range of capercaillie (Tetrao urogallus L.) in many European countries can be observed, mostly due to habitat destruction by human activity, unecological forestry management, and increased density of natural predators. Ex situ in vitro gene banks provide a unique opportunity to preserve the genetic material for future generations. Simple and effective cryo...
The objective of this study was to investigate the effect of different levels of egg yolk on quality of Zel ram spermatozoa in pre and post freezing conditions. Semen samples were collected from 4 healthy and mature rams using an electro-ejaculator and suitable samples were mixed with Tris extender in a ratio of 1:4 semen and samples were assessed, after cooled to 5-0C. Then, 0.5 ml of straws...
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