A STUDY OF ASSOCIATION BETWEEN ELISA RESPONSE TO INFECTIOUS DISEASE AGENTS AND CALVING INTERVAL IN CATTLE IN THE TROPICS OF MÉXICO

Forty eight cows of Holstein-Zebu crosses with at least one completed pregnancy were tested for antibodies to 20 disease agents. The testing was performed within one month (average two weeks) after calving when the IgG level constantly reaches its lowest value during the cows reproductive cycle. The...

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Bibliographic Details
Published in:Ciência rural 1993-12, Vol.23 (3), p.329-332
Main Authors: Barajas-Rojas, José Alfonso, Riemann, Hans, Franti, Charles
Format: Article
Language:English
Subjects:
AGRONOMY
anticorpos
doenças infecciosas
intervalo entre partos
México
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Summary:Forty eight cows of Holstein-Zebu crosses with at least one completed pregnancy were tested for antibodies to 20 disease agents. The testing was performed within one month (average two weeks) after calving when the IgG level constantly reaches its lowest value during the cows reproductive cycle. The results indicate that increasing levels of IgG against Leptospira interrogans serovar hardjo and Mycobacterium paratuberculosis may be associated with an increased calving interval. Increase in calving intervals could not be explained by age of cows or their genotypic characteristics. Quarenta e oito vacas cruzas Holandês-Zebu com pelo menos uma prenhez completa foram testadas para anticorpos contra 20 agentes infecciosos. O teste foi realizado dentro de um mês (média de 2 semanas) após o parto quando o nível de IgG alcança constantemente seu valor mais baixo durante o ciclo reprodutivo das vacas. Os resultados indicam que níveis crescentes de IgG contra Leptospira interrogans serovar hardjo e Mycobacterium paratuberculosis podem estar associados com um aumento no intervalo entre partos. Aumento nos intervalos entre partos não pôde ser explicado pela idade das vacas ou suas características genotípicas.
ISSN:0103-8478
1678-4596
0103-8478
DOI:10.1590/S0103-84781993000300015