Abstract
Problem statement: An experiment was conducted to study the effect of microbial phytase supplementation and citric acid on thyroid activity, relative weight of lymphoid organs and pH values of some GI-tract segments in broiler chickens fed corn-soybean meal based diets. Approach: The data was analyzed using a Randomized Complete Block Design (RCBD) with factorial arrangement of 3×3, three levels of citric acids (0, 3 and 6%) and three levels of phytase (0, 500 and 1000 IU kg−1). There were three replicates (with ten chicks in each replicate) for each treatment. A total of 270 Ross 308 broiler chicks were used. Results: Addition of citric acid to diets caused significant decrease in pH values of crop, gizzard, duodenum, jejunum and ileum (p<0.05) and caused significant increase (p<0.01) in plasma triiodothyronine (T3) concentration, T3:T4 ratio and relative weight of bursa and thymus, but had no significant effect on thyroxin (T4) concentrations. Microbial phytase significantly increased relative weight of thymus (p<0.01), but had no significant effects on thyroid gland activity, relative weight of bursa and values of pH in different parts of the GI-tract. Conclusion: Broiler chicks fed on acidifiers diets had better immune response resistance that lead to immunological advances. Also, decreasing pH in GI-tract by CA caused a beneficial effect in the inhibition of intestinal bacteria competition.
Highlights
Phytase feed enzymes have more general application as their substrate is consistently present in pig and poultry
The results indicated that Citric acid (CA) caused significant increase in T3, T3:T4 ratio, bursa and thymus (p
Current study data indicated that CA significantly decreased pH value of GI-tract segments (p
Summary
Phytate and phytate-bound phosphorus (P) are diets and their dietary inclusion economically effect present in all poultry diets and the partial availability of bioavailability of P and reduces the P load in the phytate-P has long been recognized (Lowe et al, 1939). environment. Previous researches have shown that poultry contrast, the inclusion of phytase feed enzymes in digestive tract acidity is not desirable to complete monogastric diets has been far more widely accepted hydrolyze or establish phytate by phytase Animal & Vet. Sci., 6 (1): 1-6, 2011 and improve phytase enzyme activity, because the concentration (triiodothyronine and thyroxin). Phytase efficiency is correlated with both acidity and Immediately after collection, tubes were placed in an concentration of other free cations Kemme et al (1998) reported that plasma samples were stored at -20°C in Eppendorf phytase efficiency is related to plant or microbial tubes and analyzed subsequently. MP and CA and their interaction on plasma hormones per replicate (6 birds per treatment) were taken concentration, relative weight of lymphoid organs and randomly, weighed and killed by cervical dislocation, pH values of some gastrointestinal tract segments
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