Single-trait selection as optimal selection responses for 305 day milk traits based on various parts of first lactation records in fleckvieh [electronic resource].
Language: English Summary language: Arabic Description: p.425-437Other title:- الاستجابة الأمثل للانتخاب الفردى لصفات إنتاج اللبن فى 305 يوم باستخدام أجزاء مختلفة من سجلات موسم الحليب الأول لأبقار الفلاكفيه
- Zagazig journal of agricultural research, 2003 v. 30 (2) [electronic resource].
Includes references.
Data were collected in two consecutive years (1990,1991) and included 19000,27158 and 18999 records of different data sets at 31-120, 61-150 and 31-150 day of lactation for the first lactation in Fleckvieh cows. Yields of 305-and simulated cumulative 31-120, 61-150 and 31-150-day of milk, fat, protein and fat-plusprotein and percentage of protein yield/fat yield were studied. The effects of calving year-season (CYS), age at first calving (AFC), days open (DO), the period from the first monthly test-day to next calving date (CTRDF) and sire on milk traits were investigated. Variance components, correlation coefficients and heritabilities of these traits were estimated. The indirect selection were calculated for various simulated cumulative milk traits (CMT).
Summary in Arabic.
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