Abstract
The effect of feeding low dietary crude protein (CP) with different levels of supplemental protease enzyme on commercial broilers was investigated. Three-hundred broiler chicks were divided into five treatments with six replicates in a completely randomized design. The experimental diets were positive control (recommended CP levels, T1), negative control (level of CP reduced by 5%, T2), negative control + 300 g t-1 protease (T3), negative control + 400 g t-1 protease (T4) and negative control + 500 g t-1 protease (T5). Growth, blood serum, carcass quality and meat quality parameters were measured. Data were analysed using one-way Analysis of Variance. The highest live weight (2.86 ± 0.07 kg), weight gain (2.66 ± 0.05 kg) and the lowest feed conversion ratio (1.84 ± 0.06) were observed in birds fed with T5. There was no influence of treatments (p>0.05) on NH3 emission from litter, dressing percentage, meat quality and blood serum parameters. The feed cost per producing 1 kg of live weight and sellable carcass weight was significantly low (p<0.05) in T5. Thus, it can be concluded that low protein diets supplemented with protease enzyme at 500 g t-1 support better growth performances in broiler chicken with a lower cost of production.
Highlights
The demand of the world market for poultry products is rapidly rising with the growing population
Effect of treatments on feed intake, weight gain and feed conversion ratio (FCR) of broilers fed with different rations supplemented with protease enzyme are presented in Table 1, 2 & 3, respectively
*The treatments were, T1 = positive control, T2 = negative control, T3 = negative control + 300 g t-1 protease, T4 = negative control + 400 g t-1 protease and T5 = negative control + 500 g t-1 proteases
Summary
The demand of the world market for poultry products is rapidly rising with the growing population. The broiler sector has a vital role to make people food secure, in both economically and nutritionally. It has been estimated by the Food and Agriculture Organization that as of 2024, broiler meat production will reach 134 million metric tons (Anon 2018). It was predicted that meat consumption per person per year will increase by 26% from 2006 to 2030 and this increase is mainly for chicken meat (OECD-FOA 2010). The poultry industry has to grow continuously to meet the increasing demand. To supply the increasing demand, the broiler industry needs to be further commercialized, aiming at higher profits to the owner
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