RESUMEN
An overview is given about the importance of biosecurity in the poultry industry, and a comparison is made with other systems of disease control such as vaccination and medication. Different measures considered to be important in bio-security are reviewed and some expectations for the future are given. Furthermore, some attention is paid to the animal welfare aspects.
Asunto(s)
Industria de Procesamiento de Alimentos/normas , Industria de Procesamiento de Alimentos/tendencias , Productos Avícolas/normas , Bienestar del Animal , Animales , Inspección de Alimentos , Industria de Procesamiento de Alimentos/organización & administración , Aves de Corral , Enfermedades de las Aves de Corral/epidemiología , Enfermedades de las Aves de Corral/prevención & control , Prevalencia , Zoonosis/epidemiologíaRESUMEN
In commercial pure white leghorn lines, A, B, and C, the effects on resistance against a virulent strain of Marek's disease virus were assessed for B19 and B21 haplotypes of the chicken major histocompatibility complex. B haplotypes were identified by direct hemagglutination using alloantisera raised against erythrocyte antigens. In homozygous B21 female chicks from lines A and B, mortality upon challenge with virus was 16% and 9%, respectively; in B19 chicks, mortality was 42% and 60%, respectively. Intermediate mortality was observed in heterozygous B19/B21 birds. When line A and B hens were crossed with B15/B15 or B5/B19 cocks from line C, differences between B19 and B21 were significant only in the progeny from B5/B19 sires. Therefore, it was concluded that selection for major histocompatibility complex-associated disease resistance markers may be useful only when B haplotypes complement each other in commercial line crosses and when interactions with genetic background do not severely obscure the differential haplotype effects, as are observed within pure lines.