Prevalence of failure of passive transfer of immunity in newborn heifer calves and associated management practices on US dairy operations

被引:193
作者
Beam, A. L. [1 ]
Lombard, J. E. [1 ]
Kopral, C. A. [1 ]
Garber, L. P. [1 ]
Winter, A. L. [2 ]
Hicks, J. A. [2 ]
Schlater, J. L. [2 ]
机构
[1] USDA APHIS VS, Ctr Epidemiol & Anim Hlth, Ft Collins, CO 80526 USA
[2] USDA APHIS VS, Natl Vet Serv Labs, Ames, IA 50010 USA
关键词
dairy calf; failure of passive transfer of immunity; risk factor; immunoglobulin G; ACID-BASE-BALANCE; BOVINE COLOSTRUM; IMMUNOGLOBULIN ABSORPTION; FEEDING COLOSTRUM; HEAT-TREATMENT; MORTALITY; SURVIVAL;
D O I
10.3168/jds.2009-2225
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Failure of passive transfer of immunity (FPT) in dairy replacement calves has been linked to increased neonatal morbidity and mortality and long-term decreases in productivity. The purpose of this study was to estimate the prevalence of FPT in US dairy heifer calves in 2007 and to use nationally representative data to investigate associations of FPT with colostrum and calf management practices. A cross-sectional study was conducted by the USDA's National Animal Health Monitoring System between January and August 2007. Producers from 394 operations in 17 states completed survey questions about colostrum and calf management practices, and serum samples were collected from 1,816 healthy heifer calves on those operations. Serum immunoglobulin G (IgG) levels were determined by radial immunodiffusion, and calves were classified as having FPT if the IgG concentration was less than 10 mg/mL. To investigate associations between FPT and management practices, a multivariable analysis was completed using a weighted logistic regression model. The estimated prevalence of FPT in US dairy heifer calves was 19.2%. The odds of FPT were higher for calves on operations that pooled colostrum [odds ratio (OR = 2.2)], allowed nursing (OR = 2.4), or hand fed colostrum more than 4 h after birth (OR = 2.7). The odds of FPT were also higher for calves on operations that did not provide a source of heat during cold weather for calves experiencing a dystocia (OR = 1.6), would not seek veterinary assistance when unable to correctly position a calf for delivery (OR = 2.6), or did not routinely monitor serum proteins in calves as a measure of passive transfer (OR = 13.8). The prevalence of FPT in dairy heifer calves has decreased in the last 15 yr, so progress has been made in this important area of calf management. This study identified several management practices associated with FPT that could be targeted for educational campaigns or further research.
引用
收藏
页码:3973 / 3980
页数:8
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