Genetic (Co)variance between Age from First to Third Calving and Milk Yield of Holstein Cows in the Tropics
محورهای موضوعی : Camel
جی.ال. اسپینوزا-ویلاویسنسیو
1
,
آ. پلاسیوس-اسپینوسا
2
,
آ. منندز-بوکسادرا
3
1 - Departamento de Ciencia Animal y Conservación del Habitat, Universidad Autónoma de Baja California Sur, La Paz, México
2 - Departamento de Ciencia Animal y Conservación del Habitat, Universidad Autónoma de Baja California Sur, La Paz, México
3 - Departamento de Genética, Grupo Meragen Campus Rabanales, Universidad de Córdoba, Cordoba, España
کلید واژه: Holstein, heritability, milk production, calving, genetic correlations,
چکیده مقاله :
A total of 245187 records of the first three lactations of 131126 Holstein cows in tropical conditions were used to estimate the genetic (co)variance components between age at calving and its respective milk productions. A multivariate analysis of six traits was performed. Heritability for age at calving (h2AC) and milk yield (h2MY) decrease from the first (h2AC1=0.254±0.007; h2MY1=0.198±0.003) to the second (h2CA2=0.242±0.006; h2MY2=0.184±0.003) and third lactation (h2CA3=0.232±0.006; h2MY3=0.168±0.008). The genetic correlations (rg) between the AC1; AC2 and AC3 and between MY1; MY2 and MY3 were high and positive; however, the rg between age at calving and milk production were medium but negative. The first two eigenvalues accounted for 83% of the total genetic variance of the six traits. The corresponding eigenvectors were used as weighting factors,and two underlying expected breeding values (EBV) were estimated based on these components, allowing the identification of those sires that reduced ages at calving and increased milk yield in their daughters. A new approach was developed to estimate an equivalent of calving interval (CIeq) based on the differences between the EBV of the sire for two consecutive ages at calving.
مجموعه‌ای از 245187 رکورد از سه دوره شیردهی اول 131126 گاو هلشتاین در شرایط گرمسیری برای برآورد مولفه‌های (کو)واریانس ژنتیکی بین سن در زمان گوساله‌زایی و تولید شیر مربوطه آنها استفاده شد. یک آنالیز چند متغییره از 6 صفت انجام شد. وراثت‌پذیری برای سن در زمان گوساله‌زایی (h2AC) و مقدار شیر (h2MY) از اولین دوره شیردهی (h2AC1=0.254±0.007; h2MY1=0.198±0.003) به دومین دوره شیردهی (h2AC2=0.242±0.006; h2MY2=0.184±0.003) و سومین دوره شیردهی (h2AC3=0.232±0.006; h2MY3=0.168±0.008) کاهش داشت. همبستگی‌های ژنتیکی (rg) بین AC1; AC2 و AC3 و بین MY1; MY2 و MY3 بالا و مثبت بودند؛ اگرچه، rg بین سن در زمان گوساله‌زایی و تولید شیر متوسط اما منفی بودند. دو مقدار ویژه اول برای 83 درصد از واریانس ژنتیکی کل 6 صفت محاسبه شد. بردارهای ویژه متناظر به عنوان فاکتورهای وزنی استفاده شدند، و دو ارزش اصلاحی (EBV) بر اساس این مؤلفه‌ها برآورد شدند، اجازه می‌دهند آن پدرانی که سن در زمان گوساله‌زایی را کاهش ومقدار شیر را در دخترانشان افزایش می‌دهند شناسایی شوند. یک رویکرد جدید برای برآورد یک معادل فاصله گوساله‌زایی (CIeq) براساس تفاوت‌های بین EBV پدر برای دو گوساله‌زایی پیاپی توسعه داده شد.
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