Economic evaluation: digestible lysine nutritional plans for swine during growing-finishing phases

The current economic viability study was developed evaluate the effect of nutritional plans with digestible lysine for castrated and immunocastrated male pigs, gilts and mixed lots, on the nutritional costs and profitability of animals in the finishing phase. 26 nutritional plans for digestible lysine, ranging from 0.65 to 1.3%, were collected from seven available scientific publications. Performance and quantitative carcass traits from 1178 pigs were analyzed and also were calculated the feed cost of weight gain (FCwg), revenue into carcass bonus system (RCbs); revenue for remuneration of live weight animals commercialization (RLw); gross profit when carcasses were sold based bonus system (GPbc) or when sold based on live weight (GPlw). Subsequently, sensitivity analysis was performed for each digestible lysine nutritional plan, adopting the MOP methodology. Diets for immunocastrated barrows using digestible lysine nutritional sequence of 1.1, 1.0, and 0.9% resulted in greater economic gains. While for castrated barrows is recommended 0.8, 0.7, and 0.6% digestible lysine plans. For gilts, the higher profits were generated by the nutritional sequence of 1.0, 0.9, and 0.8%. Profitability for mix lots fed with digestible lysine of 0.85, 0.75, and 0.65% nutritional sequence showed high profitability. Therefore, reduce digestible lysine concentrations for diets in growing-finishing phase for pigs might increase profitability.