DSpace

University of Limpopo
Institutional Repository

 

University of Limpopo Institutional Repository >
Faculty of Science and Agriculture >
School of Agriculture >
Theses and Dissertations (Agriculture) >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10386/519

Title: The effect of egg weight hatchability, chick hatch-weight and subsequent productivity of Venda chickens
Authors: Thamaga, Marupine Windy
Advisors: Ng'ambi, J.W.
Other Contributors: Norris, D.
Keywords: Egg weight
Chick hatch-weight
Issue Date: 2010
Publisher: University of Limpopo
Abstract: An experiment was conducted to determine the effect of egg weight on hatchability, hatch-weight and subsequent productivity of Venda chickens. A total of 360 Venda chicken eggs based on their weights were collected within one week and assigned to four treatments with five replicates of 18 eggs per replicate. A randomized design was used. The four treatment weights were below 49 g, between 50 and 59 g, between 60 and 69 g and above 70 g. the eggs were incubated for 21 days. The chicks were raised up to 13 weeks based on their treatments but fed a similar diet. Egg weight was positively and strongly correlated (r2 = 0.727) with hatchability. Similarly, egg weight was positively and strongly correlated (r2 = 0.0.953) with chick hatch-weight. Between one and seven weeks old, Venda chicks hatched from heavier eggs ate less (P< 0.05) than those hatched from lighter eggs. Heavier eggs hatched chicks with better (P< 0.05) feed conversion ratio. However, chicks hatched from heavier eggs tended to have higher (P< 0.05) live weight at seven weeks old than those hatched from lighter eggs. Heavier eggs tended to hatch chicks that had higher (P< 0.05) mortality rates. However, metabolisable energy and nitrogen retention of the chicks aged seven weeks was not (P> 0.05) affected by egg weight. Growth rate and live weight of the chicks aged between one and seven weeks were optimized at different Venda chicken egg weights of 56 (r2 = 0.514) and 60 (r2 = 0.870) g, respectively. Egg weight had no (P> 0.05) effect on metabolisable energy, feed conversion ratio, growth rate, live weight, carcass weight and carcass parts of Venda chickens aged between eight and 13 weeks except fat pad weight. Venda chickens hatched from lighter eggs had lower (P< 0.05) fat pad weights than those hatched from heavier eggs. Meat samples of chickens hatched from lighter eggs had higher (P< 0.05) nitrogen contents. It is concluded that Venda chicken egg weight affects (P< 0.05) egg hatchability, chick hatch-weight, growth rate, live weight and carcass characteristics of the chicken. However, these variables are optimized at different egg weights. This has implications on selecting eggs for incubation.
Description: Thesis (M.Sc. (Agric)) --University of Limpopo, 2010
URI: http://hdl.handle.net/10386/519
Library of Congress Subject Headings: Eggs
Eggs -- Biotechnology
Appears in Collections:Theses and Dissertations (Agriculture)

Files in This Item:

File Description SizeFormat
A. MSC COVER PAGE.pdf01cover8.07 kBAdobe PDFView/Open
B. DECLARATION.pdf02front26.29 kBAdobe PDFView/Open
C. Thamaga CHAPTER 1,2,3,4,5 AND 6.pdf03thesis403.05 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

DSpace Software Copyright © 2002-2010  Duraspace - Feedback