Events of elevated somatic cell counts in high-producing dairy cows are associated with daily body weight loss in early lactation

被引:24
|
作者
van Straten, M. [1 ,2 ,3 ]
Friger, M. [2 ]
Shpigel, N. Y. [3 ]
机构
[1] Mutual Soc Vet Serv, IL-38900 Caesarea Ind Pk, Israel
[2] Ben Gurion Univ Negev, Fac Hlth Sci, Dept Epidemiol & Hlth Serv Evaluat, IL-84105 Beer Sheva, Israel
[3] Hebrew Univ Jerusalem, Fac Agr, Koret Sch Vet Med, IL-76100 Rehovot, Israel
关键词
body weight; dairy cow; body condition score; somatic cell count; ESCHERICHIA-COLI MASTITIS; CLINICAL MASTITIS; REPRODUCTIVE-PERFORMANCE; ENERGY-BALANCE; CONDITION SCORE; HOLSTEIN COWS; CATTLE; MILK; HEALTH; RISK;
D O I
10.3168/jds.2009-2204
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The objective of this study was to determine associations between body weight (BW) and body condition score (BCS) variables indicating a more severe negative energy balance in early lactation and events of somatic cell counts (SCC) > 250,000 cells/mL and SCC > 400,000 cells/mL in dairy cows. We studied lactations from 634 primiparous and 1,086 multiparous Israeli Holstein dairy cows originating from 7 commercial dairy farms. Generalized mixed models with a random herd effect were used to quantify the effects of BW and BCS variables in early lactation on events of elevated SCC. Data were analyzed using 2 different approaches. In the first approach, only first events in a lactation were taken into account, whereas in the second approach, all events in a lactation were analyzed and repeated events from the same cow were accounted for. Although no associations were found between the different BW and BCS variables and first events of elevated SCC, associations were present between these variables and events of elevated SCC when all events were analyzed. The cumulative incidence of a lactation with multiple events of SCC > 250,000 cells/mL was 8.8 and 27.7% for primiparous and multiparous cows, respectively. The odds of an event of SCC > 250,000 cells/mL were 25% greater for cows belonging to the upper quartile in relative BW loss from calving to nadir BW (loss > 12.3, 15.0, and 15.7% for first-, second-, and third-parity and greater cows, respectively) compared with cows losing less relative BW. Odds of an event were 44% greater for cows with ketosis when compared with cows without. The cumulative incidence of a lactation with multiple events of SCC > 400,000 cells/mL was 4.1 and 14.3% for primiparous and multiparous cows, respectively. The odds of an event of SCC > 400,000 cells/mL were 43% greater for cows belonging to the upper quartile in relative BW loss from calving to nadir BW compared with cows losing less relative BW. Odds of an event were 33% greater for cows with ketosis when compared with cows without. Assuming that extreme BW loss and ketosis in early lactation indicate a more severe negative energy balance, our findings support the hypothesis that greater negative energy balance in early lactation predisposes dairy cows to udder inflammation. Considering the fact that many of the events were recurring, we stress the importance of including all events in the analysis and postulate the possibility of long-term detrimental effects of negative energy balance on udder health.
引用
收藏
页码:4386 / 4394
页数:9
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