Apparent amino acid absorption from feather meal by chicks.

Area of Science:

• Animal Nutrition
• Digestive Physiology
• Biochemistry

Background:

• Feather meal (FM) is a protein source, but its amino acid digestibility can vary.
• Accurate assessment of nutrient bioavailability is crucial for formulating effective animal diets.
• Understanding amino acid absorption is key to optimizing poultry feed efficiency.

Purpose of the Study:

• To determine the apparent ileal absorption values of individual amino acids from feather meal in chicks.
• To compare the amino acid absorption from feather meal with that of soybean meal.
• To identify specific amino acids with low absorption from feather meal.

Main Methods:

• Apparent amino acid absorption was measured in the lower ileum of chicks.
• Magnesium ferrite was used as an indigestible marker in the diets.
• Amino acid composition of feather meal residues after pepsin and pancreatin digestion was analyzed.

Main Results:

• Average apparent amino acid absorption from feather meal was low (approx. 0.50), significantly lower than soybean meal (approx. 0.85).
• Individual amino acid absorption values from feather meal varied widely (0.20 to 0.70).
• Aspartic acid, histidine, lysine, glutamic acid, and cystine exhibited particularly low absorption from feather meal.

Conclusions:

• Feather meal has limited apparent amino acid bioavailability for chicks, especially for certain essential amino acids.
• The low absorption of specific amino acids from feather meal may be linked to their resistance to digestive enzymes.
• Further research into the factors affecting feather meal amino acid digestibility is warranted for improved feed formulation.