During the 35 d trial, 80 male broilers of the Ross 308 strain were used. The birds
were raised on wood shaving litter. In a three phase feeding program, the starter, grower and
finisher were offered during 1-20 d, 21-27 d and 28-35 d respectively. Feed and water was
offered for ad libitum consumption. The diets were offered to the birds in meal form and the
chemical composition of the diets is shown in Table 1. Samples of the feed mixture were
ground and analysed according to AOAC procedures.16 There were 4 dietary treatments and
each treatment had 4 replicates with 5 birds per replicate pen. Birds from each pen were
assigned to 1 of 4 treatments that differed in the supplement added to the feed until slaughter
age (35 d): control (CON), 200 mg/kg of thymol (THY), 5 g/kg of tannic acid (TAN) and 5
g/kg of gallic acid (GAL). At 35 d, the birds were killed by cervical dislocation and
exsanguination.
Animal growth performance
Body weight (BW) was recorded weekly for all birds. Body weight gain, feed consumption
and feed utilization (g of gain/kg of feed) were calculated pen wise for the respective periods.
During the 35 d trial, 80 male broilers of the Ross 308 strain were used. The birdswere raised on wood shaving litter. In a three phase feeding program, the starter, grower andfinisher were offered during 1-20 d, 21-27 d and 28-35 d respectively. Feed and water wasoffered for ad libitum consumption. The diets were offered to the birds in meal form and thechemical composition of the diets is shown in Table 1. Samples of the feed mixture wereground and analysed according to AOAC procedures.16 There were 4 dietary treatments andeach treatment had 4 replicates with 5 birds per replicate pen. Birds from each pen wereassigned to 1 of 4 treatments that differed in the supplement added to the feed until slaughterage (35 d): control (CON), 200 mg/kg of thymol (THY), 5 g/kg of tannic acid (TAN) and 5g/kg of gallic acid (GAL). At 35 d, the birds were killed by cervical dislocation andexsanguination.Animal growth performanceBody weight (BW) was recorded weekly for all birds. Body weight gain, feed consumptionand feed utilization (g of gain/kg of feed) were calculated pen wise for the respective periods.
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