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|Title:||Genetic parameters for egg-, chick- and live-weight traits recorded in farmed ostriches ('Struthio camelus')||Contributor(s):||Bunter, Kim L (author); Cloete, SWP (author)||Publication Date:||2004||DOI:||10.1016/j.livprodsci.2004.06.008||Handle Link:||https://hdl.handle.net/1959.11/693||Abstract:||Estimates of genetic parameters for egg weight (EGWT), hatched chick weight (CHWT) and live weights recorded at 3 (LW3), 6 (LW6), 10 (LW10) or 14 months of age (SLWT) were obtained using an animal model, with data recorded in a commercially managed pair-breeding ostrich flock. Significant systematic effects included production year and month (seasonal effects), egg position in the laying sequence, hen age and parental diet for egg and chick weights; or seasonal effects, weighing date and age at weighing for live weight traits. Estimates of heritabilities were moderate, ranging from 0.15±0.03 for CHWT to 0.28±0.10 for SLWT. The exception was live weight at 3 months, for which no significant additive variation was detected.Maternal genetic and permanent environmental effects (m2 and c2) explained 25–30% each of phenotypic variation for EGWT and CHWT but were less important for juvenile live weights (m2 was not significant and c2<10%).Correlations between random effects for EGWT and CHWT were very high, resulting in a phenotypic correlation (rp) of 0.84±0.01.Genetic correlations (rg) between EGWT and CHWT or among LW6, LW10 and SLWT were close to unity. EGWT, and to a lesser extent CHWT, were not strongly associated with the later live weights (rg: -0.24±0.24 to 0.36±0.23; rp: 0.04±0.05 to 0.15±0.04).Parameters indicate that ostrich live-weight traits will respond to selection.||Publication Type:||Journal Article||Source of Publication:||Livestock Production Science, 91(1-2), p. 9-22||Publisher:||Elsevier Science B.V.||Place of Publication:||Amsterdam, The Netherlands||ISSN:||0301-6226||Field of Research (FOR):||070201 Animal Breeding||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 134
|Appears in Collections:||Journal Article|
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