کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10973679 | 1108017 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Short communication: Effect of heat stress on nonreturn rate of Italian Holstein cows
ترجمه فارسی عنوان
ارتباط کوتاه: اثر استرس گرما بر میزان عدم بازگشت گاوهای هلشتاین ایتالیایی
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کلمات کلیدی
گاو شیری، نقطه شکست نقطه درجه حرارت رطوبت، استرس گرما، صفات تولید مثل، وراثت پذیری،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
The data set consisted of 1,016,856 inseminations of 191,012 first, second, and third parity Holstein cows from 484 farms. Data were collected from year 2001 through 2007 and included meteorological data from 35 weather stations. Nonreturn rate at 56 d after first insemination (NR56) was considered. A logit model was used to estimate the effect of temperature-humidity index (THI) on reproduction across parities. Then, least squares means were used to detect the THI breakpoints using a 2-phase linear regression procedure. Finally, a multiple-trait threshold model was used to estimate variance components for NR56 in first and second parity cows. A dummy regression variable (t) was used to estimate NR56 decline due to heat stress. The NR56, both for first and second parity cows, was significantly (unfavorable) affected by THI from 4 d before 5 d after the insemination date. Additive genetic variances for NR56 increased from first to second parity both for general and heat stress effect. Genetic correlations between general and heat stress effects were â0.31 for first parity and â0.45 for second parity cows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 99, Issue 7, July 2016, Pages 5837-5843
Journal: Journal of Dairy Science - Volume 99, Issue 7, July 2016, Pages 5837-5843
نویسندگان
S. Biffani, U. Bernabucci, A. Vitali, N. Lacetera, A. Nardone,