کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5542290 | 1402516 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A single ultrasound determination of â¥25 follicles â¥3 mm in diameter in dairy heifers is predictive of a reduced productive herd life
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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![عکس صفحه اول مقاله: A single ultrasound determination of â¥25 follicles â¥3 mm in diameter in dairy heifers is predictive of a reduced productive herd life A single ultrasound determination of â¥25 follicles â¥3 mm in diameter in dairy heifers is predictive of a reduced productive herd life](/preview/png/5542290.png)
چکیده انگلیسی
Fertility and productive herd life (time in herd after birth of first calf) are inferior in dairy cows with relatively low compared with intermediate but not high numbers of follicles growing during ovarian follicular waves. The present study, therefore, tested the hypothesis that fertility and productive herd life are lower in dairy heifers with high follicle numbers compared with age-matched herdmates with fewer follicles. To test this hypothesis, 11 to 15 mo old Holstein heifers were subjected to a single ultrasound measurement of the number of follicles â¥3 mm in diameter. Heifers were classified into a high- (â¥25 follicles), mid- (16-24), or low-range (â¤15) follicle number group (FNG). All heifers not removed from the herd before first calving (n = 408) had the opportunity to start their fifth or sixth lactation after birth of their first calf. During this time, performance and health parameters for each individual were recorded daily by herd managers. Results showed that heifers in the high-range FNG had a 180-d shorter productive herd life, reduced survival rate, and greater probability of being culled after birth of the first calf, as well as fewer lactations compared with heifers in the low-range FNG. Cows in the high-compared with the mid- or low-range FNG also had greater involuntary culling rates, days open, and services per conception, and lower pregnancy rates during the first, second, or third lactations. We concluded that dairy heifers with â¥25 follicles â¥3 mm in diameter have suboptimal fertility and a shorter productive herd life compared with herdmates with fewer follicles.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 100, Issue 6, June 2017, Pages 5019-5027
Journal: Journal of Dairy Science - Volume 100, Issue 6, June 2017, Pages 5019-5027
نویسندگان
F. Jimenez-Krassel, D.M. Scheetz, L.M. Neuder, J.R. Pursley, J.J. Ireland,