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Title: Physiological basis of prolapse in turkeys
Author: Buchanan, S.
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2000
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Prolapse of the oviduct is a common problem which results in 5% mortality of female male-line breeding turkeys that have been selected for high meat yield. Prolapse is rare in unselected traditional-line turkeys. Male-line turkeys are characterised by large multiple ovulating ovaries compared to traditional-line turkeys. It was proposed that the large ovary of the male-line resulted in a high plasma oestradiol concentration, which stimulated collagen degradation in the oviduct, impairing the structural integrity of the oviduct and predisposing the male-line to prolapse. There was no disproportion in growth of the oviduct, ovary, uterus, vagina, sphincter ani muscle or muscular cord of ventral ligament in the male-line compared to the traditional-line. Histological investigation of the uterus, vagina, sphincter ani muscle and muscular cord of ventral ligament from traditional-, male-line and prolapsed male-line turkeys revealed no abnormalities that could be associated with prolapse. The male-line had a lower vaginal collagen content than the traditional-line, while male-line turkeys with prolapse had an even lower vaginal collagen content. No differences were seen in the collagen content of the uterus between the different groups. It was concluded that reduced vaginal collagen in the male-line impaired the structural integrity of the vagina and predisposed the strain to prolapse. The collagen of the prolapsed turkeys had fewer mature cross-links than the collagen of the non-prolapsed turkeys that would substantially reduce the strength of the tissue. This suggested that there may be increased collagen turnover in the prolapsed turkeys. The male-line had a lower plasma oestradiol concentration than the traditional-line, and there as no significant difference in plasma progesterone concentration between the two strains. Administration of oestradiol increased plasma oestradiol concentrations but had no effect on the vaginal collagen content in either strain. Progesterone administration also had no effect on vaginal collagen content in either strain although plasma progesterone was raised.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available