دوره 8، شماره 15 - ( بهار 1396 )
جلد 8 شماره 15 صفحات 209-201 |
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(2017). Estimation of Genetic Parameters and
Genetic Trends of Somatic Cell Score in Iranian Holsteins
. Res Anim Prod. 8(15), 201-209. doi:10.29252/rap.8.15.201
URL: http://rap.sanru.ac.ir/article-1-765-fa.html
URL: http://rap.sanru.ac.ir/article-1-765-fa.html
خان‌زاده حسن، قوی حسین‌زاده نوید. برآورد فراسنجه‌های ژنتیکی و روند
ژنتیکی امتیاز سلولهای سوماتیک در گاوهای هلشتاین ایران پژوهشهاي توليدات دامي 1396; 8 (15) :209-201 10.29252/rap.8.15.201
چکیده: (5113 مشاهده)
هدف از مطالعه حاضر، برآورد مؤلفههای واریانس ژنتیکی و محیطی دائمی و روند ژنتیکی و فنوتیپی رکوردهای روزآزمون امتیاز سلولهای سوماتیک (SCS) دوره اول شیردهی گاوهای هلشتاین ایران بود. دادهها شامل 108995 رکورد روزآزمون بودند که طی سالهای 1380 تا 1389 توسط مرکز اصلاح نژاد و بهبود تولیدات دامی جمعآوری شدند. برای تعیین اثرات ثابت برازش یافته در مدل آنالیز از رویه GLM نرمافزار SAS و آنالیز ژنتیکی با استفاده از الگوریتم AIREML نرمافزار WOMBAT انجام شد. 16 مدل رگرسیون تصادفی متفاوت مطالعه و بر اساس معیار اطلاعات آکایک (AIC) با هم مقایسه شدند و مدل رگرسیون تصادفی با درجات برازش به ترتیب 4، 4 و 5 برای رگرسیون ثابت، اثر تصادفی ژنتیکی افزایشی و محیطی دائمی به عنوان بهترین مدل در نظر گرفته شد. واریانس باقی‌مانده در چهار سطح ناهمگن در طول دوره شیردهی در نظر گرفته شد. وراثت‌پذیری برآورد شده بسیار پایین (022/0 تا 032/0) بود که نشان‌دهنده این است که این صفت بیشتر تحت تأثیر اثرات محیطی است. هم‌بستگی ژنتیکی و محیطی در روزهای نزدیک به هم بالا و بین روزهای اول و آخر دوره شیردهی پایین بود. هم‌چنین، هم‌بستگی محیطی برآورد شده در کلیه مراحل شیردهی کمتر از هم‌بستگی ژنتیکی بود. روند ژنتیکی و فنوتیپی سالانه برای SCS به ترتیب 103/0±59/0- و 002/0±08/0- برآورد شد. روند ژنتیکی و فنوتیپی معنیدار بودند (p<0.0001). روند ژنتیکی و فنوتیپی منفی نشان‌دهنده موفقیت برنامههای اصلاح نژادی در کاهش بروز ورم پستان در گاوهای هلشتاین ایران است.
فهرست منابع
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