Designing an optimal pig feeding schedule in southern Thailand
Duangdaw Sirisatien(Macquarie University, New South Wales (Australia). Division of Enocomic and Financial Studies. Dept. of Statistics) | Wood, Graham(Macquarie University, New South Wales (Australia). Division of Enocomic and Financial Studies. Dept. of Statistics) | Morel, Patrick(Massey University, Palmerston North (New Zealand). College of Sciences. Nutrition an Human Health. Institute of Food) | Yuthana Siriwathananukul(Prince of Songkla University. Hat Yai Campus, Song Khla (Thailand). Dept. of Animal Science)
This paper describes a method used to design an optimal feeding schedule for a pig producer in southern Thailand, maximizing the gross margin per pig place per year. A feeding schedule is a series of diets, each diet being described parametrically and fed for a fixed period. For a given feeding schedule, linear programming is used to find the least cost diet and a growth model used to predict the configuration of the pig after a certain number of days of growth. A genetic algorithm is then used to search for the feeding schedule which maximizes gross margin per pig place per year. The results indicate that the use of linear programming, a growth model and nonlinear optimization together in the design in order to change a feeding schedule, diet composition, digestible energy level of the diets, lysine to digestible energy level of the diet and daily feed intake of pigs to reduce feed cost can increase profitability of pig production of the farmer in southern Thailand.
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