GENETIC STUDIES ON YOLK AND PLASMA CHOLESTEROL CONCENTRATION IN A LOCAL LAYING HENS STRAIN 2- CORRELATED RESPONSE OF REPRODUCTIVE TRAITS | ||
| Egyptian Journal of Agricultural Research | ||
| Article 24, Volume 82, Issue 2, July 2004, Pages 845-856 PDF (2.66 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/ejar.2004.258360 | ||
| Authors | ||
| MOHAMED A. KOSBA1; MAGDA M. BALAT1; MOHAMED BAHI EL-DEEN2; HANAN H. GHANEM1 | ||
| 1Animal Production Research Institute, Agricultural Research Center , Ministry of Agriculture, Dokki, Giza, Egypt | ||
| 2Faculty of Agriculture, Alexandria University, Alexandria, Egypt | ||
| Abstract | ||
| The present experiment was conducted throughout five successive generations to decrease the egg yolk cholesterol concentration in local strain, selected for egg production traits. Cholesterol and total lipids concentration for egg yolk and plasma were determined and reproductive traits were taken to calculate the correlated response for low level of egg yolk cholesterol content. Fertility and hatchability percentage, age and body weight at sexual maturity, egg number, egg weight and egg 'mass during the first 90 days of laying estimated the h2, for these traits. The main results obtained could be summarized as follows: Selection for low level of egg yolk cholesterol content decreased both hatchability percentage and body weight at sexual maturity by 196% and 0.07 g, respectively, after four generations of selection, but, increased age at sexual maturity, egg number, egg weight and egg mass by 6.7 day, 4.27 egg, 1.59g and 260.62g, respectively. The heritability for age and body weight at sexual maturity, egg number, egg weight and egg mass during the first 90 days of laying were 0.19, 0.32, 0.05, 0.12 and 0.11, respectively, for selected line, while, the corresponding estimates for control line were 0.51, 0.34, 0.47, 0.13 and 0.18, lespectively. | ||
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