Response to selection for nine month liveweight in Australian feral goats

Oka, I Gusti Lanang (1994). Response to selection for nine month liveweight in Australian feral goats PhD Thesis, School of Veterinary Science, University of Queensland. doi:10.14264/uql.2016.431

       
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Author Oka, I Gusti Lanang
Thesis Title Response to selection for nine month liveweight in Australian feral goats
School, Centre or Institute School of Veterinary Science
Institution University of Queensland
DOI 10.14264/uql.2016.431
Publication date 1994
Thesis type PhD Thesis
Supervisor W.A. Pattie
R.A.E. Pym
Total pages 174
Language eng
Subjects 0707 Veterinary Sciences
Formatted abstract
Attempts to improve the genetic potential of Australian feral goats as meat producing animals are considered to be important at present since the demand for goat meat is increasing in the world. 

The main objectives of this study were to evaluate the response to selection for liveweight at nine months of age in Australian ferai goats, as well as the correlated responses with other characters associated with meat production and to check prior estimates of genetic parameters from a randomly bred base population. 

The phenotypic and genetic parameters for growth were estimated from 1203 complete records of progeny of 46 sires in the herd prior to selection (base population). Direct response to selection for nine month liveweight as well as the realised heritability of the selected character, correlated responses with other characters and their realised genetic correlations with the selected character were estimated from 1652 complete records over the six years of selection. Divergent selection for high and low liveweight at nine months of age was commenced in 1985 and terminated in 1990. Each selection line consisted of 80 does and six bucks while an unselected random group, consisting of 150 does and 15 bucks, was kept as a control line. 

Liveweight at nine months of age is an effective characteristic to select in order to improve production of meat in this goat population. The 19.5 per cent coefficient of variation for this character and its moderate (0.303) heritability estimate in the base population indicated useful genetic variation and scope for selection. The average genetic responses in the selected character in the high and low lines were 5.77 and - 8.33 per cent respectively. The realised heritability of 0.268 (overall) was in good agreement with the estimated heritability in the base population.   ......................................................
Keyword Feral goats -- Australia
Goat meat -- Australia

Document type: Thesis
Collection: UQ Theses (RHD) - UQ staff and students only
 
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