Document Type : Full research articles
Authors
1
Department of animal and poultry production.Faculty of agriculture. Damanhour university
2
Professor of Poultry, Department of Animal, Poultry, and Fish Sciences, Damanhour university
3
أستاذ تربية الدواجن، كلية الزراعة، جامعة كفر الشيخ
4
رئيس بحوث فسيولوجي الدواجن، معهد بحوث الإنتاج الحيواني، مركز البحوث الزراعية
Abstract
The aim of this search was to study changes in litter weight (LW), litter size (LS), and milk production (MP) by crossing between the Sinai- Gabali (GAB) and California(CAL).Data collected from a total number of 80 does and 20 bucks were divided into four groups(GAB × GAB), (CAL× CAL), (CAL × GAB), and (GAB × CAL). The result showed a significant improving in LW at the cross (CAL × GAB) 23%, 44%, 65%, 67%, 37%, and 32% at birth, 7, 14, 21, 28, and 35 days of age respectively. Mating type affected significantly (P ≤ 0.01) in LS at birth, 7, 14, 21, 28, and 35 days, where the Genotype (CAL × GAB ) and (CAL) were superior to (GAB) and (GAB × CAL) at different age. On the other side, there were affected significantly (P ≤ 0.01) in MP at 7, 14, 21, 28, and 35 days of grown period. The cross (CAL × GAB )was the highest milk production at most periods, followed by CAL, GAB and GAB × CAL, respectively. The direct heterosis was significantly positive for body weights at 8, 9, 10, 11, and 12 weeks but it was negative at 7 weeks. The direct heterosis was significantly positive for milk production at 7, 14, 21, 28, 35 days, Its highest at weaning 35 days.
In conclusion crossing between CAL and GAB improved litter weight, litter size, and milk production provided when male California is used.
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