a 3 × 3 factorial experiment with three levels of fennel extract (fe) (0, 50, and 100 mg/kg of diet) and three levels of added vitamin d3 (vit d3) (0, 3500 and 4200 iu/kg of diet), was carried out to evaluate reproductive performanceand immune response of post molted broiler breeders(76-84 weeks).broiler breeders were weighed at 10 week after molting (74 weeks) then randomly distributed into 36...

The fate map of the early neural plate and neural fold has been established at the cephalic level by using the quail-chick marker system (Le Douarin, 1969,1973). The experimental design comprised the replacement of definite territories belonging to the neural plate and neural folds in the chick embryo by their counterparts from quail embryos at the same developmental stage. This technique is re...

1. A strain of meningococci obtained directly from the spinal fluid of a patient has been propagated in serial passage in 10 to 12 day old chick embryos without change in its essential characteristics. 2. The chick embryo is susceptible to infection with the meningococcus, and, depending on its stage of development, reacts to the infection with more or less specific lesions. 3. In chick embryos...