Loss of income from cows shedding Mycobacterium avium subspecies paratuberculosis prior to calving compared with cows not shedding the organism on two Minnesota dairy farms
Loss of income from cows shedding Mycobacterium avium subspecies paratuberculosis prior to calving compared with cows not shedding the organism on two Minnesota dairy farms
复制标题
DOI：
10.3168/jds.2009-2133
复制
发表时间：
2009-10-01
影响因子：
3.5
通讯作者：
Wells, S. J.
中科院分区：
文献类型：
--
作者：
Raizman, E. A.;Fetrow, J. P.;Wells, S. J.
量化副结核分枝杆菌感染对泌乳性能的经济影响对于鼓励奶牛生产者参与约翰氏病（JD）控制计划至关重要。本研究的目的是评估产犊前副结核分枝杆菌脱落的奶牛与检测阴性奶牛的每次泌乳净收入的差异。两个明尼苏达州奶牛场入组研究，并在关闭期间从1，048头奶牛中采集粪便样本。记录每头奶牛的产奶量、临床疾病（临床JD除外）和繁殖性能数据。总体而言，粪培养阳性（FCP）奶牛比粪培养阴性（FCN）奶牛少产1，355 kg。在当前哺乳期存活下来的粪便培养阳性奶牛的牛奶收入比FCN奶牛少276美元（1,956美元对1,680美元; SD 526美元，570美元）。粪便培养阳性奶牛被淘汰的可能性是FCN奶牛的3.0倍（95%置信区间：1.6-5.8）。FCP和FCN奶牛之间的平均开放天数（从产犊到受孕的天数）无统计学显著性，除JD外，临床疾病的成本差异较小，无统计学或经济学显著性。在所有FCP奶牛中，与FCN奶牛相比，每头奶牛每次泌乳的收入超过饲料成本损失为366美元。在FCP非淘汰奶牛中，饲料成本损失的收入比FCN奶牛多276美元，这种差异具有统计学意义。与保留在牛群中的FCN奶牛相比，保留在牛群中的未剔除FCP奶牛每次泌乳的总损失为155美元。在被淘汰的奶牛中，FCP奶牛的损失因淘汰时的年龄而减少50美元，因牛肉价值降低而减少120美元。与被淘汰的FCN奶牛相比，被淘汰的FCP奶牛总共损失了441美元。由于泌乳性能降低和早期从牛群中剔除而造成的损失应引起乳制品生产商的警觉，并促使他们对疾病采取适当的控制措施。
Quantification of the financial effect of Mycobacterium paratuberculosis infection on lactation performance is essential to encourage participation of dairy cattle producers in Johne's disease (JD) control programs. The objective of this study was to evaluate the differences in net income per lactation of cows shedding Mycobacterium paratuberculosis before calving compared with test-negative cows. Two Minnesota dairies were enrolled in the study and fecal samples were collected from 1,048 cows during the close-up period. Milk production, clinical diseases (other than clinical JD), and reproductive performance data were recorded for each cow. Overall, fecal-culture-positive (FCP) cows produced 1,355 kg less than fecal-culture-negative (FCN) cows. Fecal-culture-positive cows that survived their current lactation produced $276 less in milk income than cows that were FCN ($1,956 vs. $1,680; SD $526, $570). Fecal-culture-positive cows were 3.0 (95% confidence interval: 1.6-5.8) times more likely to be culled than FCN cows. The mean days open (number of days from calving to conception) was not statistically significant and the cost differences for clinical disease other than JD were small and neither statistically nor economically significant between FCP and FCN cows. Among all FCP cows, income over feed costs losses were $366 per cow per lactation compared with FCN cows. Among FCP nonculled cows, income over feed costs losses were $276 more compared with FCN cows and this difference was statistically significant. There was a total loss of $155 per lactation for nonculled FCP cows retained in the herd compared with FCN cows retained in the herd. Among culled cows, FCP cow losses were $50 less because of age at culling and $120 for reduced beef value. This totaled a loss of $441 for culled FCP cows compared with culled FCN cows. The losses as a result of lower lactation performance and early culling from the herd should alarm dairy producers and motivate them to implement the appropriate control measures for the disease.