Ng, Siew Thiam (1987) Observations on mortality in caged laying chickens. [Project Paper] (Submitted)
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Abstract
This study was carried out to determine the incidence and causes of mortalities in a commercial layer farm. There were 1,241 mortalities in a population of 240,192 birds over a fifteen day period, giving a "background" mortality of 0.5%. The five major causes of mortality were reproductive disorder (33.7%), cannibalism (20.5%), fatty liver and hepatic rupture (12.9%), kidney lesions (8.1%) and neoplasia (7%). There was a linear relationship between incidence of prolapsed cloaca and oviduct, and age. A higher incidence of clocal prolapse was observed in younger birds. There was also a linear relationship between incidence of cannibalism and age. A higher incidence of cannibalism was observed in older birds. The incidence of fatty liver and hepatic rupture was more common in birds over thirty weeks of age. Kidney lesion was found to occur randomly among the various age groups.
| Item Type: | Project Paper |
|---|---|
| Subjects: | Q Science > QL Zoology S Agriculture > SF Animal culture |
| Faculty: | Faculty of Veterinary Medicine |
| Depositing User: | Ms. CHE WA ZAKARIA |
| Date Deposited: | 04 Jun 2026 03:49 |
| Last Modified: | 04 Jun 2026 03:49 |
| URI: | http://psaspb.upm.edu.my/id/eprint/2820 |
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