MATERNAL COMPONENTS AS RELATED TO DIRECT COMPONENTS FOR SOME GROWTH TRAITS OF FRIESIAN CALVES IN EGYPT | ||||
| Journal of Animal and Poultry Production | ||||
| Article 4, Volume 28, Issue 5, May 2003, Page 3393-3399 PDF (471.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jappmu.2003.244145 | ||||
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| Author | ||||
| H. G. EI-Awady, | ||||
| Department Of Animal Production, Faculty of Agriculture Kafr EI-Sheikh, Tanta University, Egypt | ||||
| Abstract | ||||
| Records of growth traits from birth to weaning on 1713 Friesian calves (813 males and 900 temales) daughters of 703 dams and 93 sires during the period from 1982 to 2001 at Sakha and EI-Karada farms were used in the analysis. (Co)variance components were estimated with REML using an animal model that indu ed the fixed effects of month and year of birth, sex, farm and birth sequence. Random effects were animal, direct and maternal genetic effects, matemal permanent environ ental effect and random effect. Weight of dam at calving was included in the model as a covariate. Direct and maternal genetic effects and other parameters for birth weight (8W), weaning weight 0N'N) and daily gain (DG) from birth to weaning were estimated. Overall means and standard deviations for BW, WN and DG were 30.8 ± 5.1 kg, 96.5 ± 10.2 kg and 547 ± 89 g/day, respectively. Direct heritability of the me tloned traits was 0.32, 0.34 and 0.37, respectively. Heritabilities of maternal effects of BW (O.H), VVW (0.14) and DG (0.09) were smaller than direct heritabilities. Estimates of permanent environmental variance as a proportion of phenotypic variance were 0.12, 0.08 and 0.04 for 8W, WN and DG, respectively. Estimates of direct-mat~rnal genetic correlations in all traits studied were negative ranging from -0.59 to -0.02. Genetic and phenotypic correlations between BW and DG were small and negative, -0.14 and- 0.22, respectively, while genetic and phenotypic correlations between WN and DG were high and positive, 0.84 -and 0.93, respectively. | ||||
| Keywords | ||||
| Growth traits; Friesian calves; Maternal effect; Direct effect; Direct heritability and Direct-maternat genetic correlations | ||||
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