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Theses

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1975 - 19793
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Subject: Veterinary Anatomy × Author: KAU × End date: 1979 × Start date: 1975 × Type: Thesis × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    Studies on the postnatal development of the epididymis in the Malabari goat (capra hircus)
    (Department of Anatomy, College of Veterinary and Animal Sciences, Mannuthy, 1975) Harshan, K R; KAU; Radhakrishnan, K
    The postnatal development of epididymis was described and illustrated from studies in 39 Malabari goats, divided into 13 groups, ranging from day old to 180 days of age. The weight of epididymis was positively correlated to age and body weight. The epididymal weight was more significantly correlated to body weight than to age. The left epididymis was found to be significantly heavier than the right. The length and thickness of the head, the body and the tail of the epididymis increased with increase in the weight of the organ. The tunica albuginea was found to be fibro- muscular in structure. The interstitial tissue was fibrous. The diameter of the epididymal duct and its lumen increased with increase in age. Both these measurements were highest in the cauda, less in the corpus and least in the caput. The process of pseudostratification of the epithelial lining of lumen of the duct was completed at first in the cauda, secondly in the corpus and finally in the caput. Regional differences in the height of epithelium was noticed, the highest being in the caput, lower in the corpus and lowest in the cauda. The epithelial height increased with advance in age. Sperms were observed at 165 days of age in the lumen of the epididymal duct. The concentration of sperm was maximum in the cauda, slightly less in the corpus and least in the caput. The lumen of the epididymis of the 150 days and 165 days old goats showed some spherical cells with spherical nuclei. These were considered to be spermatogenic cells coming from the testis.
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    ThesisItemOpen Access
    Studies on the postnatal development of testis in Malabari goat
    (Department of Anatomy, College of Veterinary and Animal Sciences, Mannuthy, 1975) Unnikrishnan, M D; KAU; Radhakrishnan, K
    A detailed study on the postnatal development of testis is undertaken using 39 pairs of testis of goats belonging to Malabari breed. The animals varied in age from one day to 180 days. The experimental animals were divided into 13 groups having an age difference of 15 days between groups. It was observed that the testicular weight was positively correlated with age and body weight of the animal. The growth of testis could be divided into two phases. A slow gradual increase in weight until about 135 days of age and a sharp rise thereafter till adulthood. The left testis was found to be more heavier than the right testis in the same animal. During growth, the shape of the organ was not altered. The diameter or seminiferous tubule was found to be positively correlated with age, body weight and testicular weight of the animal. Weight of testis was found to be having a greater influence on the diameter of seminiferous tubule than age or body weight. Goat testis follows five phases of postnatal development based on histological changes. It was established that a Malabari buck attains sexual maturity by the age of 180 days.
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    ThesisItemOpen Access
    Studies on the structure and development of the thymus in the Indian runnert duck
    (Department of Anatomy, College of Veterinary and Animal Sciences, Mannuthy, 1979) Sreedharanunni, C K; KAU; Radhakrishnan, K
    A study on the structure and development of thymus in the Indian Runner Duck during embryonic and post - embryonic period was conducted. Thymus from 60 birds ranging in age from day old to 180 days were collected for the study and embryonic studies were carried out in embryos of third, eighth, 15th and 22nd days of incubation. There were five pairs of lobes, on an average lying in the lower half of the neck. The weight of the thymus increased with age upto 180 days and the posteriormost lobe was the largest. There was a significant difference between the weights of anterior and posterior and middle and posterior lobes. Histological structure was more or less similar to that in mammals. The diameter of Hassall’s corpuscle was found to be positively correlated with age. The thymic primordium appeared by the third day of incubation. Lobulation was evident by the 15th day and by 22nd day of incubation cortex and medulla were discriminated.