Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs
Dissertation (MSc (Veterinary Science))--University of Pretoria, 2022.
Saved in:
| Other Authors: | |
|---|---|
| Format: | Thesis |
| Language: | English |
| Published: |
University of Pretoria
2023
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613663361236992 |
|---|---|
| access_status_str | Open Access |
| author2 | Brown, Geoff |
| author_browse | Brown, Geoff |
| author_facet | Brown, Geoff |
| collection | Thesis |
| dc_rights_str_mv | © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc (Veterinary Science))--University of Pretoria, 2022. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/90974 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:43.676Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2023 |
| publishDateRange | 2023 |
| publishDateSort | 2023 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/90974 Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs Brown, Geoff amohlasi@gmail.com Botha, Ester Mofokeng, Mahlasinyane UCTD Hatchability Egg Embryo Crocodile Egg Temperature Dissertation (MSc (Veterinary Science))--University of Pretoria, 2022. In contrast to older experimental systems which typically incubated eggs at constant temperature, recent wide availability of inexpensive programmable microcontrollers has enabled the development of incubators capable of simulating circadian temperature variation. The present study aimed to compare the effect of two sinusoidally fluctuating temperature regimens (31±3 °C and 31±6 °C) with a constant temperature regimen (31 °C) on egg hatchability of the Nile crocodile, Crocodylus niloticus. Towards the end of the incubation period, an electronic malfunction introduced extreme temperatures (cumulative exposure of eggs to 47 hours of extreme temperatures, with a range of 16.3 to 45.4 °C) which confounded the results. A conditional logistic regression model was used with hatching outcome as the response variable, and incubation regimen and extreme temperature exposure group as the predictor variables. Exposure to extreme temperatures had a severe negative effect on hatchability compared with eggs incubated at a constant temperature of 31 °C (P<0.001). An interesting trend (P=0.12) was that both fluctuating temperature groups had a positive association with hatchability when compared to the constant-temperature group. The hypothesis that fluctuating temperatures may be positively associated with measures of C. niloticus embryo and hatchling health warrants further investigation after addressing the technical challenges identified during the current study. Production Animal Studies MSc (Veterinary Science) Unrestricted 2023-05-30T13:11:55Z 2023-05-30T13:11:55Z 2023-04 2022 Dissertation * A2023 http://hdl.handle.net/2263/90974 10.25403/UPresearchdata.22775417 en © 2021 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Hatchability Egg Embryo Crocodile Egg Temperature Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title | Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title_full | Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title_fullStr | Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title_full_unstemmed | Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title_short | Effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of Nile crocodile (Crocodylus niloticus) eggs |
| title_sort | effect of variation in incubation temperature and exposure to extreme temperature on the hatchability of nile crocodile crocodylus niloticus eggs |
| topic | UCTD Hatchability Egg Embryo Crocodile Egg Temperature |
| url | http://hdl.handle.net/2263/90974 |