Comparative analysis of hatching rates and clutch sizes of Nile crocodile (Crocodylus niloticus) eggs collected on- and off-farm in Zimbabwe
| Autor: | Vimbai R. Hamandishe, V. E. Imbayarwo-Chikosi, Patricia Khosa |
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| Rok vydání: | 2011 |
| Předmět: |
Zimbabwe
Veterinary medicine Alligators and Crocodiles Conservation of Natural Resources Animal breeding biology Nile crocodile Hatching Tropics Crocodile biology.organism_classification Clutch Size Crocodylus Fishery Food Animals Productivity (ecology) biology.animal embryonic structures Animals Animal Science and Zoology Seasons Animal Husbandry Rank correlation Ovum |
| Zdroj: | Tropical animal health and production. 44(4) |
| ISSN: | 1573-7438 |
| Popis: | The Nile crocodile (Crocodylus niloticus) is a large aquatic reptile predominant in the tropics in Africa and Zimbabwe in particular. Clutch sizes and hatching rates of Nile crocodile eggs collected from the wild and on-farm in Lowveld, Highveld and Kariba regions of Zimbabwe were evaluated. A total of 274 egg records for the period 2000 to 2008 from 39 farms were collected from the Crocodile Farmers Association of Zimbabwe. The effect of source of eggs was analysed using the non-parametric one way analysis of variance procedure of SAS Version 9.1.3. Wilcoxon signed rank test for independent samples was used to compare the mean hatching rates and clutch sizes for eggs collected from the different sources by region. The degree of association between clutch sizes and the hatching rates by source and region was determined using the Spearman's rank correlation test. Source of eggs had no effect (P0.05) on hatching rates in all the regions but significantly influenced (P0.05) clutch sizes in Lowveld and Kariba. In these regions, clutch sizes in the wild were significantly (P0.05) higher than those on-farm. Correlation estimates between clutch size and hatching rates were weak and non-significant (P0.05) for the different sources of eggs in all regions. Full utilization of the wild resource would reduce challenges relating to shortage of captive breeders and high cost of rearing breeders and hence increase productivity. |
| Databáze: | OpenAIRE |
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