Genetic and Phenotypic Trends of Fertility Traits in Iranian Holstein Cows
محورهای موضوعی : Camel
1 - Department of Animal Science, Faculty of Agricultural Science, Payame Noor University, Tehran, Iran
2 - Department of Animal Science, Shahr-e-Qods Branch, Islamic Azad University, Tehran, Iran
کلید واژه: fertility traits, genetic trends, Iranian Holstein cows, phenotypic trend,
چکیده مقاله :
A total of 72124 fertility records was used to estimate the genetic and phenotypic trend of fertility traits in Iranian Holstein cow from 1981 to 2007. Fertility traits in this study were: days from calving to first service (DFS), number of insemination per conception (INS), days open (DO), interval between first and last insemination (IFL), calving interval (CI) and success to first insemination (SF). The overall genetic trend in fertility traits was as desired and statistically significant. Mean breeding value of SF increase by 0.00067 percent per year. The annual genetic trends for INS, DFS, IFL, CI and DO were -0.0029 number/year, -0.062 days/year, -0.041 days/year, -0.23 days/year and -0.24 days/year, respectively. Phenotypes trends for fertility traits were unfavorable except for DFS and DO. Phenotypic trends in IFL, INS and SF were as undesirable positive. Phenotypically DO and CI did not change over the time period. Phenotypically IFL has increased 1.6 days/year and DFS has decreased 1.6 days/year. The annual phenotypic trends for INS and SF were 0.04 and -0.018, respectively.
جهت برآورد روندهای ژنتیکی و فنوتیپی از 72124 رکورد باروری گاوهای هلشتاین ایران که طی سالهای 1360 تا 1386 جمعآوری شده بود، استفاده شد. صفات باروری عبارت بودند از: فاصله زایش تا اولین تلقیح (DFS)، تعداد تلقیح به ازای هر آبستنی (INS)، روزهای باز (DO)، فاصله بین اولین و آخرین تلقیح (IFL)، فاصله گوسالهزایی (CI) و موفقیت در اولین تلقیح (SF). روند ژنتیکی مطلوب و معنیدار برای صفات باروری مشاهده گردید. میانگین ارزش اصلاحی SF در هر سال 00067/0 افزایش یافت. روند ژنتیکی سالانه برای INS، DFS، IFL، CI و DO به ترتیب برابر 0029/0-، 062/0-، 041/0-، 23/0- و 24/0- بود. روند فنوتیپی بجز برای DO و DFS برای بقیه صفات باروری نامطلوب بود. روند فنوتیپی برای IFL، INS و SF روند افزایشی نامطلوب بود. روند فنوتیپی برای DO و CI در طول زمان بدون تغییر بود. مقدار IFL از لحاظ فنوتیپی 6/1 روز افزایش و DFS 6/1 روز کاهش یافته است. روند فنوتیپی سالانه برای INS و SF به ترتیب برابر 04/0 و 018/0- بود.
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