کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10974641 | 1108027 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Cow characteristics and their association with production performance with different dry period lengths
ترجمه فارسی عنوان
خصوصیات گاو و ارتباط آنها با عملکرد تولید با طول دوره های مختلف خشک
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کلمات کلیدی
طول دوره خشک، تنوع گاوهای فردی، عملکرد شیر، شیردوشی مداوم،
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
Shortening or omitting the dry period (DP) has been proposed as a management strategy to improve energy balance of dairy cows in early lactation. Both shortening and complete omission of the DP reduces milk production in the subsequent lactation compared with a conventional DP length of 60Â d. Some cows have less milk production loss than other cows after applying no DP or a short DP. The aim of this study is to evaluate which cow characteristics are associated with the amount of milk production losses following no DP or a short DP (30Â d). Daily production information from the lactation before and after the DP was available from 161 dairy cows (54 cows with a 0-d DP, 51 cows with a 30-d DP, and 56 cows with a 60-d DP) from a research herd. Daily production (milk, fat, and protein) until 305Â d in milk was estimated for all cows. Subsequently, total fat- and protein-corrected milk yield from 60Â d before the expected calving date until 305Â d in the following lactation (FPCMtotal) was estimated. A statistical analysis was performed to evaluate which cow characteristics were associated with limited or no production losses following no DP or a short DP, compared with a conventional DP length of 60Â d. Average FPCMtotal was 9,341, 10,499, and 10,795Â kg for cows with no DP, a 30-d DP, and a 60-d DP, respectively. The cow characteristics parity, daily milk production at 12Â wk before the expected calving date, and reduction in daily milk production between 16 and 12Â wk before the expected calving date were associated with production loss due to a short (30Â d) or no DP. Compared with 60Â d DP, multiparous cows had less production loss (987Â kg) following no DP than primiparous cows (2,132Â kg). The difference in FPCMtotal between the 3Â DP groups was largest for cows with a low milk production (e.g., 10Â kg/d) at 12Â wk before the expected calving date. The greater the reduction in milk production between 16 and 12Â wk before the expected calving date, the larger the difference in FPCMtotal between the 3Â DP groups. The difference in FPCMtotal between cows with no DP and 60Â d DP at a reduction in milk production between 16 and 12Â wk of 10% was 665Â kg, whereas this difference was 1,138Â kg at a reduction of 70%. The cow characteristics found can be used to select cows for specific DP lengths in a decision-support model to support the farmer on the economic optimal DP length for each individual cow. Output of such a decision-support model can be, for instance, to advise a 30-d DP for multiparous cows with high milk production (e.g., 25Â kg/d) at 12Â wk before the expected calving date.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 97, Issue 8, August 2014, Pages 4922-4931
Journal: Journal of Dairy Science - Volume 97, Issue 8, August 2014, Pages 4922-4931
نویسندگان
W. Steeneveld, A.T.M. van Knegsel, G.J. Remmelink, B. Kemp, J.C.M. Vernooij, H. Hogeveen,