Simultaneous vaccination of broilers with live vaccines against infectious bursal disease, Newcastle disease and coccidiosis
2006
Terzic, K. (Veterina d.o.o., 10436 Rakov Potok (Croatia)) | Cajavec, S. (Veterina d.o.o, 10436 Rakov Potok (Croatia)) | Kracun, F. (TSH d.d. Cakovec, 40000 Cakovec (Croatia)) | Savic, V. (Hrvatski veterinarski institut, Zagreb (Croatia). Centar za peradarstvo)
The effect of simultaneous vaccination of broilers with live vaccines against infectious bursal disease (IBD), Newcastle disease (ND) and coccidiosis was investigated. Four successive commercial broiler flocks were housed in the same poultry house and vaccinated against three diseases according to different vaccination programs. All flocks were vaccinated at the age of 9 days with Livacox(R) T vaccine against coccidiosis and with Pestikal(R) La Sota SPF vaccine against ND. At the same time, flock 1 was vaccinated with Gumbokal(R) IM SPF vaccine against IBD, whereas flocks 2, 3, 4 and 5 were vaccinated with Gumbokal(R) IM forte SPF vaccine against IBD, which contains the same vaccinal strain as Gumbokal(R) IM SPF but in a ten-fold higher title per dose. Flocks 1, 2 and 4 were revaccinated against IBD at the age of 18 days using the same vaccines as for priming, whereas flocks 3 and 5 were not revaccinated. The birds were clinically monitored, production data were recorded, numbers of Eimeria spp. oocysts per gram of faeces were counted and immune responses to ND and IBD were assessed during the study period of 42 days. Satisfatory production results were achieved in all flocks with production indexes of 321, 296, 292, 301 and 317 in flocks 1, 2, 3, 4 and 5, respectively. The vaccines against IBD had no adverse effect on vaccination and immune responses to ND and coccidiosis although all three vaccines were given simultaneously. Oocyst development after vaccination against coccidiosis was in accordance with previously reported data. Satisfactory antibody titres for ND virus were achieved with the highest level at the age of 28 days except in flocks 4 and 5 in which the titre levels continued to rise. Solid immunity against IBD was achieved in flocks 1, 2 and 4, but only after revaccination, which indicates that IBD vaccinal strain of intermediary type was neutralized by high titres of maternal antibodies even when ten-fold higher amount of the vaccinal virus was used.
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