ESTIMATION OF VARIANCE COMPONENTS BASED ON DIALLEL CROSSES OF FOUR LINES OF NORFA CHICKENS

ABOU EL-GHAR, REDA SH.; MAHMOUD, TAHA H.; GEBRIEL, GODA M.; ABDOU, FAROUK H.; ENAB, AHMED A.

doi:10.21608/ejar.2004.256810

	ESTIMATION OF VARIANCE COMPONENTS BASED ON DIALLEL CROSSES OF FOUR LINES OF NORFA CHICKENS
Egyptian Journal of Agricultural Research
Article 28, Volume 82, Issue 1, March 2004, Pages 343-354 PDF (2.51 M)
Document Type: Original Article
DOI: 10.21608/ejar.2004.256810
Authors
REDA SH. ABOU EL-GHAR¹; TAHA H. MAHMOUD¹; GODA M. GEBRIEL²; FAROUK H. ABDOU²; AHMED A. ENAB²
¹Animal production Research Institute, Agricultural Research Centre, Ministry of Agriculture, Dokki, Giza, Egypt
²Faculty of Agriculture, Minufiya University, Egypt
Abstract
Data of full 4 x 4 diallel crosses involving four Norte lines of chickens characterized with early sexual maturity (LSM), more egg number at the first ninety days of laying (LEN), heavy egg weight mean of the first laid five eggs (LEW) and heavy body weight at sexual maturity (LBW), were analyzed by Gritting (1956) method I model 11. A total of 60 males and 180 females were used to produce each One cross and line group. The L BW parental line had the highest body weights at hatch. 4, 8, 12 and 16 weeks of age (i.e. 34.2, 225.5, 536.3. 1049.3 and 1561 g.. respectively). The additive genetic variances (8² A) for body weight were 1.66. 100.48. 595.19, 8188.45 and 31800.59 for body weights at hatch, 4, 8, 12 and 16 weeks of age, respectively. The non-additive ge- netic variance (5² s) were 1.65, 208.18, 655.3, 1484.73 and 3878.7 at the same ages, respectively. The estimates of general combining ability / specific combining ability mean squares ratio were 0.50, 0.24, 0.45 2.75 and 4.09 for body weights at hatch, 4, 8, 12 and 16 weeks of age, respectively. Heritability estimates were 0.31, 0.28, 0.13. 0.42 and 0.66 for the same ages. These estimates showed an increase of additive genetic variance (C A) as the age advanced.

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