کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10979112 1108061 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Variance component and breeding value estimation for genetic heterogeneity of residual variance in Swedish Holstein dairy cattle
ترجمه فارسی عنوان
ارزیابی مولفه های واریانس و برآورد ارزش پرورش برای ناهمگنی ژنتیکی واریانس باقی مانده در گاو شیری سوئد هلشتاین
کلمات کلیدی
احشام لبنیاتی، ناهمگونی ژنتیکی، عملکرد شیر، نمره سلول سوماتیک،
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
چکیده انگلیسی
Trait uniformity, or micro-environmental sensitivity, may be studied through individual differences in residual variance. These differences appear to be heritable, and the need exists, therefore, to fit models to predict breeding values explaining differences in residual variance. The aim of this paper is to estimate breeding values for micro-environmental sensitivity (vEBV) in milk yield and somatic cell score, and their associated variance components, on a large dairy cattle data set having more than 1.6 million records. Estimation of variance components, ordinary breeding values, and vEBV was performed using standard variance component estimation software (ASReml), applying the methodology for double hierarchical generalized linear models. Estimation using ASReml took less than 7 d on a Linux server. The genetic standard deviations for residual variance were 0.21 and 0.22 for somatic cell score and milk yield, respectively, which indicate moderate genetic variance for residual variance and imply that a standard deviation change in vEBV for one of these traits would alter the residual variance by 20%. This study shows that estimation of variance components, estimated breeding values and vEBV, is feasible for large dairy cattle data sets using standard variance component estimation software. The possibility to select for uniformity in Holstein dairy cattle based on these estimates is discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 96, Issue 4, April 2013, Pages 2627-2636
نویسندگان
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