A comparison was made of rates of growth and body weights between pre- and post-hatching stages of development of the chicken as affected by strains or strain crosses, egg storage, egg weights, time of hatch, sex and post-hatching nutritional environment. The interrelationships of these factors were also investigated.
The results of the investigation indicate that practically
all of the variation of six-week body weight in this data was successfully accounted for by the combined effects of six-week growth rate, hatching weight and embryonic growth rate between eight and twelve days. The data also indicate that gains in six-week body weight may be made by selecting for early growth rate without concomitant
change in other traits.
Hatching time, hatching weight and post-hatching growth appear to be affected by egg storage only if some form of stress is present during incubation. In the absence of stress it appears that a compensatory increase in rate of embryonic growth overcomes the effect of a delayed initiation of growth caused by egg storage.
A significant influence of sex on embryo weight in favour of the male embryos was observed. / Land and Food Systems, Faculty of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/38012 |
| Date | January 1965 |
| Creators | Deland, Michael Campbell |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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