Trypanosomiasis-induced infertility in dromedary (Camelus dromedarius) bulls: changes in plasma steroids concentration and semen characteristics
| Autor: | Hossam El-Din M. Omar, M.S El-Belely, S. A. El-Mougy, A.A Al-Qarawi, H. A. Abdel-Rahman |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Male
Infertility endocrine system medicine.medical_specialty Camelus Semen Serology Andrology Lethargy Endocrinology Food Animals Trypanosomiasis Internal medicine medicine Animals Testosterone Infertility Male Estradiol Sperm Count biology urogenital system General Medicine Trypanosoma evansi biology.organism_classification medicine.disease Spermatozoa Mucus Sperm Motility Steroids Animal Science and Zoology |
| Zdroj: | Animal Reproduction Science. 84:73-82 |
| ISSN: | 0378-4320 |
| DOI: | 10.1016/j.anireprosci.2003.10.013 |
| Popis: | The effect of Trypanosomiasis on concentrations of plasma steroids and semen characteristics was studied in 24 dromedary bulls. Based upon the parasitological and serological diagnosis, 18 bulls were found infected with Trypanosoma evansi (Group 2) and six were found to be free from infection and served as controls (Group 1). The infected animals exhibited signs of anaemia indicated by the decrease of packed cell volume (PCV) and haemoglobin concentration (Hb), pale mucus membranes, weight loss, lethargy, weakness and dullness. However, five animals (27.8%) of the infected group revealed elevated rectal temperatures and three animals (16.7%) revealed testicular degeneration upon palpation of their scrotal contents. Concentrations of plasma oestradiol-17beta (86.5 +/- 8.6 pg/ml versus 232.5 +/- 74.4 pg/ml) and testosterone (4.8 +/- 0.7 ng/ml versus 2.7 +/- 1.5 ng/ml) were significantly different (P0.05) between the control and infected bulls. Evaluation of the semen collected by electroejaculation and evaluated by a computerized cell motion analyzer revealed normal semen characteristics in the control animals compared to deteriorated ones in the infected bulls. There were highly significant (P0.01) decreases in sperm count (12.2 +/- 1.3/ml versus 6.5 +/- 4.9 x 10(6)/ml), motility percentage (68.2 +/- 6.7% versus 27.4 +/-15.6%), percentage of live spermatozoa (73.2 +/- 8.3% versus 35.8 +/- 8.2%) and increases in percentage of morphological abnormalities (3.3 +/- 0.6% versus 15.9 +/- 1.0%) in the infected group. An examination of the plasma hormonal profiles and semen characteristics in the infected bulls indicated that altered Sertoli cell function due to formation of immune complexes in four bulls (Group 2A), pituitary dysfunction in six bulls (Group 2B), testicular degeneration in three bulls (Group 2C) and finally trypanotolerancy in five bulls (Group 2D) are possible factors responsible for poor semen characteristics and infertility induced by T. evansi infection in dromedary bulls. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect