Investigation of the genetic gain resulted from incorporating sexed semen and embryo transfer reproductive technologies

sattarvand, Jamal (2017) Investigation of the genetic gain resulted from incorporating sexed semen and embryo transfer reproductive technologies. Masters thesis, University of Mohaghegh Ardabili.

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Text (بررسی دستاورد ژنتیکی حاصل از تلفیق تکنولوژی های تولید مثلی انتقال جنین و اسپرم تعیین جنسیت شده) Jamal sattarvand.pdf Download (388kB) | Preview

Abstract

The aim of this study was to investigate the genetic gain resulting from the integration of sexed semen and embryo transfer reproductive technologies in livestock units. In recent years, sexed semen has been commercially available and for breeding programs Race in dairy cows. The separation of sperms containing chromosomes x and y and its use for promoting breeding programs, especially in dairy cows, may be important because these types of sperm can be found in mass production of sex More desirable to be used The number of insemination per pregnancy is very important due to its effect on reproductive, genetic and economic performance of the herd. On the other hand, the researchers estimate that if the use of embryo transfer technique in female cattle as the mother of males, the rate of genetic progression due to increased number Male calves from female cows increase by 14%, although this technique produces very few calves, but its impact is very high because the quality of the offspring produced by this technology is very high, the use of transfer embryo can be of the intensity of selection Increase in femals This is done by increasing the reproduction rate of superior cows genetically, in other words, increasing the selectivity of the famal If the sex semen with this technique is used, it can increase the intensity of selection and thereby increase the genetic gain. In this study, we use simulation methods to study the genetic gain resulting from the integration of reproductive technologies of embryo transfer and sex semen. To determine whether the use of sex sex sperm in the embryo transfer technique is affected Genetic achievement in dairy herds. For this purpose, the Visual Basic 6 program is used. To estimate the genetic progression after using the transfer embryo technique, the milk production rate of 305 days will be used. For this purpose, it is necessary to have a flock of suitable number of heifers, the first lacting cow and the second lacting cattle are simulated by designing the population by random sampling and using the Visual Basic 6 programming environment. The breeding value of the herd animals is also simulated with a standard genetic variation and, using the REL's reliability, the estimated breeding value (EBV) of the herd animals is simulated using the relevant formulas. Then, using estimated breeding values (EBV) and taking into account different strategies for combining the use of sex sorted sperm, and the transfer embryo technique, the genetic achievement rate was compared to that which was not utilized by the above techniques Takes.

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