Jordy GROFFEN,Henk K. PARMENTIER,Willem A. C. VAN DE VEN and Merlijn VAN WEERD.Effects of Different Rearing Strategies and Ages on Levels of Natural Antibodies in Saliva of the Philippine Crocodile[J].Asian Herpetological Research(AHR),2013,4(1):22-27.[doi:10.3724/SP.J.1245.2013.00022]
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Effects of Different Rearing Strategies and Ages on Levels of Natural Antibodies in Saliva of the Philippine Crocodile
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Asian Herpetological Research[ISSN:2095-0357/CN:51-1735/Q]

Issue:
2013 VoI.4 No.1
Page:
22-27
Research Field:
Original Article
Publishing date:
2013-03-25

Info

Title:
Effects of Different Rearing Strategies and Ages on Levels of Natural Antibodies in Saliva of the Philippine Crocodile
Author(s):
Jordy GROFFEN1*;  Henk K. PARMENTIER1;  Willem A. C. VAN DE VEN2 and Merlijn VAN WEERD2;  3
1 Department of Adaptation Physiology, Wageningen University, Marijkeweg 40, 6709 PG Wageningen, the Netherlands
2 Mabuwaya Foundation Inc, Isabela State University Cabagan Campus, Garita, Cabagan, 3328 Isabela, the Philippines
3 Institute of Environmental Sciences (CML), Leiden University, PO Box 9518, 2300 RA Leiden, the Netherlands
Keywords:
behaviour;  Crocodylus mindorensis;  diet;  disease;  husbandry;  stress
PACS:
-
DOI:
10.3724/SP.J.1245.2013.00022
Abstract:
The endemic Philippine crocodile (Crocodylus mindorensis) is a relatively small, critically endangered freshwater crocodile. In a head start program, crocodile hatchlings are caught in the wild, reared in captivity, and released back into the wild after two years. The current study aimed to determine optimal rearing strategies of Philippine crocodile hatchlings, including identification of possible diseases during rearing, and studying the effect of ages on natural antibody (NAb) levels. Thirty Philippine crocodiles were divided into two groups, half were reared with a hiding board, and half without the hiding board. Both groups received three different kinds of diets: meat, shrimp, or a combination of both. Saliva samples of the crocodiles were taken three times over a period of three months to test for NAb levels. Saliva samples were also taken from older crocodiles and crocodiles from different locations. NAb titres were compared to sheep red blood cells. Each time saliva samples were taken, a health check was done. The results showed that crocodiles would prefer the hiding board, and neither housing nor diet could affect the level of NAb titres in saliva. A positive correlation was found between NAb titres and body size, weight and age. Wild hatchlings had higher NAb titres than the hatchlings born in captivity, but the difference diminished with ageing. Five different diseases were found.

References:

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