Cost parameters were categorized into the total fixed costs (TFC), total variable costs (TVC), and total costs (TC) as described in previous reports (24, 25). On the other hand, return parameters, including total returns (TR) from chick sale equals kg price (20 LE in May 2017) × body weight and net profit (total returns minus total costs), were calculated. Furthermore, the efficiency of feed additives in the form of collective measures of efficiency was measured according to previous studies (26, 27).
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