Economic value of production and functional traits for crossbred and Holstein cows in Guilan Province
Author(s):
Abstract:
Economic values for production, reproduction, growth and functional traits in crossbred and Holstein cow production systems in Guilan province were estimated using a total of 16 herds consisting in average 12 and 30 cow, respectively, and a bio-economic model. Economic values were calculated in two production systems for 12 traits, classifying into four categories of production, reproduction, growth and survival. Economic value of each trait was estimated as the amount of change in the annual profit of production system by one unit increase in mean of the considered trait while the means of other traits were hold unchanged. Economic values, relative to the economic value for productive lifetime, for milk yield, fat yield, protein yield, age at first calving, calving interval, pre-weaning daily gain, post-weaning daily gain, birth weight, mature live weight, pre-weaning survival rate and post-weaning survival rate were, respectively 3.7, 0.003, -0.01, -7.26, -32.6, -4.35, -23.4, -46.55, -0.78, 4.26 and 68.68 for crossbred production system, and were 0.92, 0.001, -0.002, -6.72, -20.64, -1.10, -6.10, -11.82, 0.21, 30.49 and 25.29, for Holstein production system. The results showed, although the importance of some traits in two production systems were different, which was a reflection of overall difference in two production systems, the breeding objective of two population should be very close together, considering high similarity of economic values of traits
Keywords:
Language:
Persian
Published:
Animal Production Research, Volume:4 Issue: 3, 2015
Pages:
79 to 91
magiran.com/p1475744
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یکساله به مبلغ 1,390,000ريال میتوانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
- حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران میشود.
- پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانههای چاپی و دیجیتال را به کاربر نمیدهد.
In order to view content subscription is required
Personal subscription
Subscribe magiran.com for 70 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!