In laying hens it is characterized by respiratory signs (gasping, sneezing, coughing) and bon cadeau poste a marked decrease in egg production.
Chicks that recover may later develop cataracts after sexual maturity.
Flock production rises sharply and reaches a peak of about 90, 68 weeks later.
Tapeworms Tapeworms (cestodes) are white or yellowish, ribbon-like, segmented flat worms.
Prolonged use of sulfa drugs is toxic and causes a decrease in production in laying hens.
Monensin, and other ionophore anticoccidials, have an adverse effect on egg production when used in conjunction with low protein diets.Flooding along the Red River Valley in recent years has led to increases in nutrients flowing into the lake, as runoff from fertilized fields and raw sewage gushes into the lake.Has the level of feed consumption changed lately?There is no effective treatment for infectious bronchitis, although broad spectrum antibiotics for 3 to 5 days may aid in controlling secondary bacterial infections.Particle size affects calcium availability.In breeding flocks, a corresponding decrease in hatchability is also noted.Laying hens seldom show clinical signs when infection is going through the flock.
A typical production curve for a laying flock, showing changes in the level of egg production and in egg weight, over time, is given in Figure.