The effect of dietary crude fiber on dandarawi layining hens performance blood serum, and yplk cholsterol concentrations

الملخص EN

A trial was performed to study the effect of increasing dietary crude fiber level on the performance, blood serum and yolk cholesterol concentrations of Dandarawi laying hens.

A total of one hundred twenty, 32 weeks old Dandarawi laying hens were.

randomly assigned to four dietary treatments of 30 hens each (three replicate of 10 hens each).

Diets were formulated to have 3.01, 4.42, 6.52, and 8.46 % crude fiber (CF).

The experiment prolonged for 3 months results indicated that increasing dietary CF significantly increased feed efficiency while feed consumption was decreased.

Dietary CF levels had no significant effect on weight gain ; egg mass, egg production, albumen and yolk weight.

Shell weight, percent and thickness were significantly decreased as dietary CF increased.

Milligrams yolk cholesterol per g of yolk decreased as hens were fed increasing dietary CF levels.

Total cholesterol per yolk decreased by 5.06, 8.62 and 9.7 % at feeding CF levels of 4.42, 6.52 and 8.46%, respectively; as compared to the control diet (3.01 CF).

Serum cholesterol was significantly decreased when the dietary CF was increased; the lowest reduction (29 %) of cholesterol in serum was found in hens fed diet contained 8.46 % CF.

In conclusion, data reported in this study indicated that yolk and serum cholesterol was reduced by increasing levels of CF.

Furthermore, feeding clover hay as fiber source in diet of Dandarawi laying hens reduced yolk cholesterol without adversely affecting either egg production or egg mass furthermore, feed efficiency was significantly improved.