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Does the Naked Neck Meat Type Chicken Yield Lower Methionine Requirement Data?
Daulat R Khan1, Christian Wecke2, Frank Liebert3
1Division Animal Nutrition Physiology, Department of Animal Sciences, Georg-August-University, Kellnerweg 6, 37077 Goettingen, Germany. dkhan@gwdg.de.
Animals : an Open Access Journal From MDPI
|October 20, 2015
Summary
The methionine requirement for naked neck chickens is similar to normally-feathered chickens, regardless of genotype or feather production. This finding holds true for both starter and grower diets at a 1:1 methionine:cysteine ratio.
Area of Science:
- Animal Nutrition
- Poultry Science
- Genetics
Background:
- The naked neck (Na) gene influences feather production in chickens.
- Methionine is a crucial limiting amino acid for poultry growth and protein deposition.
Purpose of the Study:
- To determine the methionine (Met) requirement of homozygous (Na/Na) and heterozygous (Na/na) naked neck chickens.
- To assess if feather production impacts methionine needs in these birds.
Main Methods:
- Nitrogen balance experiments were conducted on 144 naked neck chickens across starter and grower periods.
- Birds were fed five diets with varying protein levels, maintaining constant protein quality and methionine as the limiting amino acid.
- Non-linear modeling of nitrogen utilization estimated methionine requirements based on genotype, sex, age, and growth performance.
Main Results:
- Average adequate methionine levels were 0.47% (Na/Na) and 0.45% (Na/na) for the starter diet.
- Average adequate methionine levels were 0.37% (Na/Na) and 0.36% (Na/na) for the grower diet.
- No significant difference in methionine requirement was observed between naked neck and normally-feathered chickens.
Conclusions:
- The methionine requirement of naked neck chickens is comparable to their normally-feathered counterparts.
- Reduced feathering in naked neck birds does not correlate with a lower methionine requirement.
- These findings are specific to the tested methionine:cysteine ratio of 1:1.
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