Pathology of selected endocrine glands in testicular disorders in bulls
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Date
2005
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Centre of Excellence in Pathology, College of Veterinary and Animal Sciences, Mannuthy
Abstract
The present investigation was undertaken to evaluate the prevalence and nature of various pathological conditions of the testis and correlate with the lesions of pituitary, thyroid, adrenal and accessory sex glands. A total of 300 bulls were screened for testicular disorders at the Corporation slaughterhouse, Thrissur and Meat technology unit, Kerala Agricultural University, Thrissur. A detailed systemic examination of 261 cases was made during the period of investigation and the gross and histopathological lesions were studied in detail, classified and documented. The study revealed a high prevalence (17.24 %) of testicular disorders in bulls. It was observed that in the Government farms, bulls of the age group above five to seven years were most commonly affected due to excessive usage for semen collection. In other than government farms, bulls of the age group three to five years were highly affected and attributed to severe nutritional deficiencies. Among the breeds, crossbred Holstein-Friesian (CBHF) and Nondescript (ND) was found to show the higher predisposition to testicular disorders. The relative weight of the testis, was decreased in hypoplasia and degeneration, increased in varicosity, fibrosis and calcification. Out of 45 testicular disorder cases, the conditions observed were aplasia (1), hypoplasia (10), degeneration (25), varicosity (2), fibrosis (3) and calcification (4) respectively.
Among the endocrine glands, lesions observed were pituitary cyst (9), pituitary haemorrhage (7), thyroid hypoplasia (7), thyroid degeneration (10), thyroid cyst (5), colloid goitre (3), nodular goitre (2), adrenal cortical hypoplasia (2), adrenal cortical hyperplasia (7) and adrenal medullary hyperplasia (12) respectively.
Among the accessory sex glands, lesions observed were hyperplasia of seminal vesicle (8), hypoplasia of seminal vesicle (6), prostatic hyperplasia (2) and prostatic atrophy (5) respectively.
Correlation study has highlighted that in many of the testicular disorders there were concurrent affections of endocrine glands particularly pituitary, thyroid and adrenal glands which is of major significance.
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