The effect of dietary protein level on performance characteristics of coccidiosis vaccinated and nonvaccinated broilers following mixed-species Eimeria challenge
Autor: | A. Barri, S. M. Anderson, Harry D. Danforth, Jongmin Lee, P. N. Anderson, David J. Caldwell, A. P. McElroy, N. H. Eckert, K. A. Ameiss, S. M. Stevens |
---|---|
Rok vydání: | 2011 |
Předmět: |
Protozoan Vaccines
animal diseases Weight Gain Feed conversion ratio Eimeria Starter Animal science medicine Animals Poultry Diseases biology Coccidiosis Broiler food and beverages General Medicine medicine.disease biology.organism_classification Vaccination Dietary protein Animal Science and Zoology Dietary Proteins medicine.symptom Chickens Weight gain |
Zdroj: | Poultry Science. 90:1916-1925 |
ISSN: | 0032-5791 |
Popis: | A series of experiments were conducted to investigate the effect of starter diet protein levels on the performance of broilers vaccinated with a commercially available live oocyst coccidiosis vaccine before subsequent challenge with a mixed-species Eimeria challenge. Data indicated that an increasing protein concentration in the starter diet improved broiler performance during coccidiosis vaccination. Prechallenge performance data indicated that vaccination could decrease BW and increase feed conversion ratio. The time period most important for the observed effects appeared to be between 13 and 17 d of age. This reduction in performance parameters of vaccinated broilers compared with nonvaccinated broilers was eliminated by the conclusion of the experiments (27 d) in the diet groups with higher protein. Vaccination was effective at generating protective immunity against Eimeria challenge, as evidenced by increased (P < 0.05) BW gain, improved feed conversion, reduced postchallenge mortality, and reduced lesion development in vaccinated broilers compared with nonvaccinated broilers. These observations support numerous other reports that confirm live oocyst vaccination can be used effectively as a preventive against avian coccidiosis in commercially reared broilers. More important, these findings suggest that reduced protein concentration of starter diets can lead to significant losses in broiler performance when using a vaccination program to prevent coccidiosis. |
Databáze: | OpenAIRE |
Externí odkaz: |