The effect of grape extracts on broiler growth

Reference: H. Juin, 2004, INRA 04/HF1/PS/0142

The trial has been performed in October 2004 during three weeks at the French National Institute for Agricultural Research (INRA, Le Magnereau) on 180 chickens who received a standard experimental feed (ME: 3050Kcal/Kg; CP: 22%, 20ppm of Vitamin E). 

Five treatments have been administrated to animals:

-          R1 (negative control);

-          R2 (positive control);

-          100ppm of Vitamin E;

-          R3: grape extract (10ppm);

-          R4: grape extract (100ppm);

-          R5: pericarp of entitled and micronized seed (60ppm).

Feed inputs are standardized in procyanidols. Chickens weight has been measured at 21 days. Animals’ weight has been improved, as follows:

In experimental conditions and in comparison with the negative control, grape extracts had a positive effect (p>0.10) for both grape extract products. Gathering grape extract batches, the average weight’s improvement reaches 4.9% (p<0.02).