EFFECT OF LOW-PROTEIN DIETS WITH SUPPLEMENTATION OF ESSENTIAL AMINO ACIDS ON BROILER CHICKEN PERFORMANCE
HAI D.T., BLAHA J.
Abstract
The aim of the experiment was observation of the effect
of low-protein diets with supplementation of methionine, lysine and threonine
on broiler cockerel performance during the period from 21st to 42nd day of age.
Four diets containing 19.44 %, 18.73 %, 16.73 % and 15.28 % of crude protein
(CP). Besides the content of crude protein, all the diets were formulated in
such a way to satisfy the need of essential ami-no acids according to standard
of the Commission of Farm Animal Nutrition, Czech Academy of Sciences and to
be isoenergetic.
At the end of fattening there were no significant differences in live weight
and feed conversion between broilers fed by low-protein diets and broilers fed
by the diet with 19.44 % CP. Low-protein diets had also little effect on dressing
percentage, meat percentage but they significantly increased the abdominal fat
content.
Key words:
Broiler, low-protein diet, amino acids, performance
of broilers.