PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS
Abd El-Rahman, A., N. Makled, M. (2006). PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS. EKB Journal Management System, 37(1), 85-103. doi: 10.21608/ajas.2006.273946
A. Abd El-Rahman; M. N. Makled. "PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS". EKB Journal Management System, 37, 1, 2006, 85-103. doi: 10.21608/ajas.2006.273946
Abd El-Rahman, A., N. Makled, M. (2006). 'PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS', EKB Journal Management System, 37(1), pp. 85-103. doi: 10.21608/ajas.2006.273946
Abd El-Rahman, A., N. Makled, M. PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS. EKB Journal Management System, 2006; 37(1): 85-103. doi: 10.21608/ajas.2006.273946

PRODUCTIVE PERFORMANCE OF NAKED NECK LAYING HENS (Sharkasi) FED DIFFERENT DIETARY PROTEIN LEVELS

Assiut Journal of Agricultural Sciences
Article 3, Volume 37, Issue 1, March 2006, Page 85-103  XML PDF (497.55 K)
Document Type: Original Article
DOI: 10.21608/ajas.2006.273946
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Authors
A. Abd El-Rahman; M. N. Makled
Animal and Poultry Prod. Dep., Fac. of Agric., Assiut Univ., Assiut
Abstract
: A total number of 667 laying hen from three genotypes : heterozygous naked neck (Na/na), homozygous naked neck (Na/Na) and normally feathered genotype (na/na) were used to study the effect of the gene responsible of  reduced feather coverage (Na), dietary protein levels (17%, 14%) and their combining effect on egg production performance. The main results could be summarized as follows:
1-                   A significant effect (P<0.01) was proved due to genotype on body weight at different ages.
2-                   The naked neck birds (Na/-) were earlier in sexual maturity (P<0.01) by about 4 days with an increase in total egg production by about 12.70% and 10% in Na/na and Na/Na when compared with their normally feathered counterparts.
3-                   The presence of Na gene improved egg weight by about 5.40% and 5.90% whereas, egg mass increased by 18.70% and 16.50% in Na/na and Na/Na genotypes, respectively.
4-                   The na/na genotype was more sensitive to the reduction in protein level than Na/- birds.
5-                   High protein level (17% vs 14%) reduced age at sexual maturity (P<0.05) and improved egg number, egg weight and egg mass by 5%, 2% and 6.70%, for Na/na, Na/Na and na/na genotype, respectively.  Also, high protein improved body weight significantly (P<0.01) at 40 wks of age.
6-                   The presence of Na gene increased albumen by about 3%, 4.70% whereas it reduced yolk % by 3.80% and 5.80% in Na/na and Na/Na genotypes respectively. The Na/- birds exhibited low egg shell quality as measured by shell %, shell strength and thickness when compared with na/na genotype.
7-                   High protein level increased significantly (P<0.01) albumen by 2.2%. whereas it reduced yolk % by 2.7% without any significant effect on egg shell quality.
8-                   The presence of Na gene reduced feather by about 26.50% and 32.80% in Na/na and Na/Na genotypes, respectively. Also, it reduced abdominal fat by 19% and 37.70% in the previous two genotypes.
9-                   The Na/- birds exhibited a significant (P<0.01) improvement in dressing % when compared with the normally feathered hens. A highly significant differences (P<0.01) existed between the different genotypes in body temperature (B.T) where the Na/- birds were lower in B.T. than the normal.
An improvement in ovary and oviduct percentages occurred due to Na 
Keywords
Naked neck gene; protein level; egg production
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