Genetic Parameter Estimates for Lactation Curve Parameters, Milk Yield, Age at First Calving, Calving Interval and Somatic Cell Count in Holstein Cows
محورهای موضوعی : CamelA. Chegini 1 , A.A. Shadparvar 2 , N. Ghavi Hossein-Zadeh 3
1 - Department of Animal Science, Faculty of Agriculture Science, University of Guilan, Rasht, Iran
2 - Department of Animal Science, Faculty of Agriculture Science, University of Guilan, Rasht, Iran
3 - Department of Animal Science, Faculty of Agriculture Science, University of Guilan, Rasht, Iran
کلید واژه: lactation curve, heritability, subclinical mastitis, wood function,
چکیده مقاله :
The objective of this study was to estimates the genetic and environmental components for the lactation curve parameters, milk yield, age at first calving (AFC), calving interval (CI) and somatic cell count (SCC) in Iranian Holstein cows. The dataset consisted of 210625 test day records from 25883 cows with milk yield in the first parity recorded from July 2002 to September 2007 in a total of 97 herds in Iran. The lactation curve and the selected lactation parameters were the scaling factor to represent yield at the beginning of lactation (a), the factor associated with the inclining (b) and declining (c) slopes of the lactation curves and the first 100-day milk yield, second 100-day milk yield, third 100-day milk yield, peak yield (Ymax), days in milk at peak yield (b/c), persistency (s), lactation length (LL) and the 305-day milk yield. The incomplete gamma function (Wood function) was used to estimate lactation curve and lactation parameters from daily milk records. Among the 100-day milk yield periods, the second 100-day milk yield had the highest heritability (0.29±0.024) and the highest genetic correlation with the 305-day milk yield (0.996±0.00). Lactation curve parameters had low h2 (0.017±0.007 to 0.051±0.011). The b / c had a relatively high genetic correlation with the 305-day milk yield (0.52±0.08), a moderate genetic correlation with CI (0.32±0.14) and negative genetic correlations with measures of somatic cell count. This suggested that b / c could be used as a criterion to improve 305-day milk yield and resistance to subclinical mastitis.
هدف این مطالعه برآورد پارامترهای ژنتیکی و محیطی فراسنجههای منحنی شیردهی، تولید شیر، سن اولین زایش (AFC)، فاصله زایش (CI) و تعداد سلولهای سوماتیک (SCC) در گاوهای هلشتاین ایران بود. پایگاه داده 210625 رکورد روز آزمون از 25883 گاو دارای رکورد تولید شیر اولین زایش در بازه زمانی تیرماه 1381 تا شهریورماه 1386 که متعلق به 97 گله بود را شامل میشد. فراسنجههای منحنی و دوره شیردهی شامل تولید شیر در ابتدای دوره شیردهی (a)، شیب افزایشی (b) و کاهشی (c) منحنی شیردهی، و تولید شیر در 100 روز اول، تولید شیر در 100 روز دوم، تولید شیر در 100 روز سوم، تولید در اوج (Ymax)، روز شیردهی در اوج (b/c)، تداوم شیردهی (s)، طول دوره شیردهی (LL) و تولید شیر 305 روز بود. تابع گامای ناقص (تابع وود) برای برآورد فراسنجههای منحنی و دورهی شیردهی از روی رکوردهای روزانه شیر مورد استفاده قرار گرفت. از میان تولید شیر در بازههای 100 روزه، تولید شیر در 100 روز دوم بالاترین وراثتپذیری (024/0±29/0) و بیشترین همبستگی ژنتیکی را با تولید شیر 305 روز (00/0±996/0) داشت. فراسنجههای منحنی شیردهی وراثتپذیریهای پایینی داشتند (بین 007/0±017/0 تا 011/0±051/0). روز شیردهی در اوج همبستگی ژنتیکی نسبتاً بالایی با تولید شیر 305 روز (08/0±52/0)، همبستگی ژنتیکی متوسطی با فاصله زایش (14/0±32/0) و همبستگی ژنتیکی منفی با معیارهای تعداد سلولهای بدنی داشت. این ارقام اظهار میدارد که روز شیردهی در اوج میتواند به عنوان معیاری برای بهبود تولید شیر 305 روز و مقاومت به ورم پستان تحت بالینی مورد استفاده قرار گیرد.
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