Economic feasibility of raising birds sex separated vs. commingled when fed maximum profit dietary lysine levels
Costa, Manuel Joao
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Economic benefits of raising birds sex separate vs. straight-run has been a paradigm for the broiler industry over the years. Three experiments were conducted to evaluate the effects of raising birds straight-run vs. sex separate (Experiment 1), and determine optimum digestible lysine (dLys – maintaining the amino acid ratio) levels for net returns (NRML) for the starter (Experiment 2) and grower phases (Experiment 3) for each system. For each of the 3 experiments an economic simulation of net returns of feed cost over whole carcass or cut-up part weights was made for different market weights considering a 1.8 million broiler complex. Experiment 1 revealed economic advantages of sex separation, on 1,344 broilers chicks of two genetic strains processed at 1.7, 2.7, and 3.7 kg MW, of $99,000 for Ross 308, and $254,700 for Ross 708. In addition, bird uniformity was increased in sex separate treatments when compared to straight-run. In experiment 2, 3,240 Ross 708 chicks were fed starter diets (0 to 25d) with 6 dLys levels (1.05% to 1.80% of dLys). A 1.6 kg projected market weight was considered to be sold as whole carcass. Females, males and straight-run birds had 1.07, 1.05, and 1.05 % NRML of dLys respectively. Sex separation was not economically viable (-$13,058) for the light market weight after the cost of sexing chicks was deducted from the returns. Experiment 3 had 2,160 Ross 708 chicks fed grower diets (14 to 32d) with 6 dLys levels (0.90% to 1.30% of dLys). There were 2 projected market weights: 1.7 kg (whole carcass – females and straight-run birds) and 2.9 kg (cut-ups – males and straight-run birds). For the whole carcass, 0.90 and 1.01% were NRML of dLys for females and straight-run birds. The cut-up market had NRML of dLys set at 1.30 and 1.14 % for males and straight-run birds. When combining the two market weights for the complex, sex separation resulted in $112,341 of extra returns. In conclusion, sex separation was shown to result in increased profitability, and NRML of dLys to be dependent on market target weight.