Abstract
An experiment was carried out to investigate the performances with 1080 male Cobb-500 broiler chicks using different levels of a microbial phytase in plantbased diet. Six dietary treatments were formulated as follows; the first 3 diets were balanced with Ca and Av. P according to the recommendation of Cobb-500 served as basal diet without phytase enzyme (T1), basal diet with 100g phytase ton-1 feed (T2) and basal diet with 200g phytase ton-1 feed (T3), while the last 3 diets were deficient in Ca and Av. P and containing no phytase enzyme (T4), diet with 100g phytase/ton feed (T5) and diet with 200g phytase ton-1 feed (T6). All 6 treatments were replicated 6 times. Body weight, feed consumption and mortality of broilers were recorded weekly. The highest body weight was found in T3 with 200g phytase ton-1 feed with recommended Ca and Av. P level in the diet, followed by T6 with 200g phytase/ton feed with deficient in Ca and Av. P level in the diet (P<0.05). The lowest weight was found in T1 without phytase with recommended Ca and Av. P level in the diet. The feed consumption, feed conversion ratio and mortality of the birds during 35 days of experimental period did not differ significantly (P<0.05). The meat yield characteristics at 35 days of age were non-significant among different treatments (P>0.05). Significantly lower value of total ash (%), Ca (%) and total P (%) of tibia was found in control group (T1) and T4. The results of this experiment revealed that phytase supplementation at 200g ton-1 of feed improved broiler performances at either recommended or deficient level of Ca and Av. P. SAARC J. Agric., 19(1): 211-222 (2021)
Highlights
The feed ingredients from plant origin used in poultry diet have some limitation that is the presence of anti-nutritional factor, phytic acid or phytate (Farrell, 1998), limits its use in poultry diet
At the end of 35 days of age, the highest live weight (1798.79g/b) was found in broilers fed diet supplemented with phytase enzyme at the level of 200g ton-1 and fortified with Ca and Available P according to the recommendation of Cobb-500 (T3)
This was followed by broiler belonging to phytase supplementation at the level of 200g/ton (1760.52g/b) with deficient in Ca and Available P requirement (T6), phytase supplementation at the level of 100g ton-1 (1718.72g/b) with recommended Ca and Available P level (T3), phytase supplementation at the level of 100g/ton (1659.85g/b) with deficient in Ca and Available P level, and no phytase supplementation (1640.79g/b, T4 and 1585.60g/bird, T1)
Summary
The feed ingredients from plant origin used in poultry diet have some limitation that is the presence of anti-nutritional factor, phytic acid or phytate (Farrell, 1998), limits its use in poultry diet. More than 60% of P in maize and soybean meal (Reddy et al, 1982) and 90% in rice polish (Lamid et al, 2014) are in the form of phytate. Phytate does reduce P availability, and decreases the absorption of elements such as zinc, iron, calcium and magnesium (Lamid et al, 2014). It decreases protein digestibility and energy use through inhibition of the enzymes such as pepsin, trypsin and α-amylase (Ravindran et al, 1995). As the phytate P has low P availability (NRC, 1994), leads to use of inorganic P sources to meet the P requirement of poultry
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