Effect of the northern fowl mite, Ornithonyssus sylviarum (Canestrini and Fanzago) on White Leghorn roosters
| Autor: | Ellen G. Steel, Joyce A. Devaney, B. F. Hogan, H. Del var Petersen, M H Elissalde |
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| Rok vydání: | 1977 |
| Předmět: |
Male
Mite Infestations Anemia Rooster Animal science parasitic diseases medicine Mite Animals Testosterone Poultry Diseases integumentary system biology Body Weight General Medicine Ornithonyssus sylviarum biology.organism_classification medicine.disease Sperm Spermatozoa White (mutation) Red blood cell medicine.anatomical_structure Hematocrit Erythrocyte Count Animal Science and Zoology Hemoglobin Chickens |
| Zdroj: | Poultry science. 56(5) |
| ISSN: | 0032-5791 |
| Popis: | The mean body weight of White Leghorn roosters was approximately 100 g. less than that of uninfested roosters 4 weeks after they were infested with the northern fowl mite, Ornithonyssus sylviarum (Canestrini and Fanzago). Both groups increased in weight throughout the 20 weeks of the test, but the differences in weight remained. Reproductive potential studies showed that after moderate populations of mites (101-1000 mites/rooster) were observed, the volume of seminal fluid decreased. Four weeks before the test ended, one-half of the infested roosters produced an average of less than 0.1 ml. of seminal fluid per week while the other half showed a decrease of 0.07 ml. in volume of seminal fluid produced when compared with the control. Sperm concentration of mite-infested roosters increased as the volume of seminal fluid decreased but was not significantly different from the controls. Motility and live/dead ratios of sperm did not show significant differences. Serum testosterone levels were significantly decreased by mite populations. Hematology studies showed the greatest decrease in red blood cell counts, and packed cell volume occurred from the 4th to the 8th week when infestations were initially increasing rapidly. Mean hemoglobin concentrations for the infested birds were numerically lower but not significantly different from the controls. No specific anemia could be attributed to mite populations as all hematological values were within normal ranges. |
| Databáze: | OpenAIRE |
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