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The occurrence of diseases and their relationship with passive immune transfer in Holstein dairy calves submitted to individual management in southern Brazil.

L. V. Vieira

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06-23-2020

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Abstract:

T18
The occurrence of diseases and their relationship with passive immune transfer in Holstein dairy calves submitted to individual management in southern Brazil.
L. V. Vieira*, M. A. A. Weiller, J. P. Noschang, J. Halfen, L. F. Bragan�a, D. A. Moreira, C. Pizoni, J. O. Feij�, A. A. Barbosa, V. R. Rabassa, E. Schmitt, C. C. Brauner, F. A. B. Del Pino, M. N. Corr�a. Universidade Federal de Pelotas Pelotas, Rio Grande do Sul, Brazil.

The failure of passive transfer of immunity (FPTI) in newborn dairy calves has been closely related to an increased incidence of calf diseases. Therefore, this study aimed to evaluate the impact of failures in the transfer of passive immunity in cases of diarrhea and respiratory diseases. The calves used in this study were descendants of commercial dairy farms located in the southern state of Brazil. Fifty-three Holstein dairy calves were monitored from birth to 60 d of age. Health checks were performed daily to get the incidence of diseases. Growth performance including BW, withers height, croup width, croup height, and chest circumference were recorded on d 7, 14, 21, 28, and 60 of the experiment. The FPTI was detected through the evaluation of total plasma proteins (TP) and its effect on the health and performance of the animals was performed based on 2 cohorts [satisfactory immunity (n = 36); and not satisfactory immunity (n = 17)] divided by the TP evaluation. The incidences between the cohorts were compared using the chi-squared test. The relative risk was calculated by the number of exposed sick animals incidence divided by the incidence of disease in unexposed animals, with a 95% confidence interval, using the Epi program. The growth performance was compared between cohorts using the ANOVA method. Seventeen animals had FPIT, while 36 had TP concentration higher or equal of 5.5g/dL in the first 24 and 48 h of life, which can be associated with adjusted immunity transfer. All animals with FPTI were diagnosed with diarrhea and 76.5% of them had respiratory diseases. However, 27 calves without FPTI were diagnosed with diarrhea and 17 with respiratory disorders, resulting in an incidence of 75% and 47.2%, respectively. The FPTI increased the relative risk for developing diarrhea by 33%, while for respiratory diseases the increased was of 62%. The growth performance was not affected by the FPTI. In view of the above, we conclude that FPTI can be a predisposing factor for diarrheal and respiratory diseases in neonatal dairy calves.

Keywords: diarrhea, respiratory diseases, neonates.