Comparative Efficacy of an Organic Acid Blend and Bacitracin Methylene Disalicylate as Growth Promoters in Broiler Chickens: Effects on Performance, Gut Histology, and Small Intestinal Milieu

Table 1

Composition of basal diet (g/kg unless stated otherwise).

Ingredients	Starter (d 1–21)	Finisher (d 22–35)
Ground maize	545	610
Soybean oil	—	7
De-oiled rice bran	35	46.8
Soybean meal (44$\%$ CP)	386	304
Oyster shell grit	18	17
Di-calcium phosphate	10	9
Common salt	1	1
Methionine	1.8	1.8
Lysine	0.5	0.7
NSP enzyme	0.5	0.5
Phytase	0.2	0.2
Vitamin and trace mineral premix^†	2	2
Nutrient value (calculated value)
Metabolizable energy MJ/kg	11.7	12.2
Crude protein	229	197
Calcium	9.5	8.7
Phosphorus	3.5	3.2
Lysine	3.4	4.15
Methionine	5.5	5.7

^†Contained (per kg) retinyl acetate (3.75 mg), 1,25-hydroxycholecalciferol 4 mg, DL $\alpha$-tocopheryl acetate 30 mg, menadione 4 mg, thiamine disulfide 3 mg, riboflavin tetrabutyrate 8 mg, methylcobalamine 0.025 mg, sodium pantothenate 15 mg, pyridoxine 5 mg, niacin 60 mg, biotin 0.2 mg, folic acid 2 mg and manganese 90 g, zinc 80 g, iron 90 g, copper 15 g (all as sulfate salt), iodine (as potassium iodide) 2 g, selenium (as sodium selenite) 0.3 g.