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  • Title: The efficacy of colostrum from cows vaccinated with rotavirus in protecting calves to experimentally induced rotavirus infection.
    Author: Castrucci G, Frigeri F, Ferrari M, Cilli V, Caleffi F, Aldrovandi V, Nigrelli A.
    Journal: Comp Immunol Microbiol Infect Dis; 1984; 7(1):11-8. PubMed ID: 6086224.
    Abstract:
    Calves which were continuously fed colostrum from vaccinated cows for the first ten days of life, were fully refractory to experimental infection with strain 81/36 F of bovine rotavirus. By contrast, the response to virus exposure of calves which were treated with normal colostrum was identical to that of the control calves, in that they underwent severe diarrhea and a significant slowing of the growth rate. The antibody titer in the milk of vaccinated cows tends to decline rapidly so that it no longer provides any protective effect. Two alternatives were considered feasible in improving prophylaxis for rotavirus infections: (a) the continuous feeding of calves with 1st day colostrum as part of the ration throughout the period of greatest risk (first week of life), or (b) enhancing the efficacy of the vaccine in pregnant cows to the point where antibody concentration in the milk would remain at a protective level.
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