Mientras que el virus de la bronquitis infecciosa (IBV) sigue siendo una seria amenaza para la salud del pollo, a menudo abre la puerta a las infecciones secundarias más costosas Escherichia coli, explicó Kalen Cookson, DVM, director de investigación clínica en Zoetis, que ha trabajado extensamente con el patógeno.
Higher stocking density can render layer hens more susceptible to Salmonella Enteritidis (SE), according to a report in Poultry Science.
In two trials, the researchers placed groups of laying hens at two different stocking densities into colony cages. One group consisted of 40 hens housed 20 per cage at a stocking density of 973 cm2 (1.04733 sq. ft.) floor space per bird, and the other group consisted of 60 hens housed 30 per cage at a stocking density of 648 cm2 (0.697501 sq. ft.) floor space per bird. The investigators orally inoculated the birds with SE and then cultured internal organs 5 to 6 days later.
Significantly more SE (p < 0.05) was recovered from livers (75% versus 51.4%) and ovaries (51.4% versus 30.6%) of hens from the higher-density group, according to investigators from USDA%u2019s Agricultural Research Service and North Carolina State and Michigan State universities.
However, they also found that spleens from hens in the higher-density colony cages were significantly (p = 0.0018) less often positive for SE compared to hens in conventional cages that were also challenged with SE but housed at the same density %u2014 90.3% versus 68.1%.
Although stocking density can influence hens%u2019 SE susceptibility, other housing system parameters might contribute to the outcome of infections, the investigators concluded.
Fuente: Poultry Healt Today
