عنوان
پدید آورنده
موضوع
رده
کتابخانه
محل استقرار
TLpq304038309
انگلیسی
Maximum profit feed formulation for broiler rations
[Thesis]
M. J. Gonzalez-Alcorta
G. M. Pesti
University of Georgia
1993
178
Ph.D.
University of Georgia
1993
The goal of feed formulation should be to maximize profit rather than minimize feeding cost. Traditionally, nutritionists formulate least-cost diets with fixed nutrient levels and assume that performance will be maximized. A series of biological and economic studies were carried out to determine if least-cost diets formulated with fixed dietary nutrient levels lead to less profits than diets formulated with varying dietary nutrient levels that maximize profits. The feed intake and body weight responses to dietary nutrient levels need to be predicted in order to calculate and maximize profits. Two concepts were compared to predict the feed intake and body weight responses: the protein to energy ratio and independent protein and energy. The J-test showed that the protein to energy ratio concept did not predict the feed intake and body weight responses accurately. Independent protein and energy levels were favored to predict body weight in eight out of nine cases and feed intake in six out of nine cases. The coefficients of determination (R of the models using independent protein and energy levels ranged between.79 and.97 for broilers, and between.45 and.65 for turkeys for the body weight and feed intake responses, respectively. The dietary protein and energy levels that maximize profits were determined through a model that considers age and specific conditions for different authors and commercial broiler lines. Maximum profits could have been achieved for the first six months of 1991 with feeds lower in energy (3.1 Mcal/Kg) and higher in protein (22%) than the dietary energy (3.2 Mcal/Kg) and protein (20%) levels usually set to maximize performance. Gross profits can be raised by 1%. Supplemental methionine can also be used to predict body weight and maximize profits. The (R of four models were compared to select the best model for predicting body weight. The (R for the logistic model (.96 to.99) was higher or very similar to the slope ratio model (.38 to.99), the bent-stick model (.91 to.99) or the ascending quadratic with plateau model (.92 to.99). The logistic model is a reliable model to describe the gain responses to DL-methionine and methionine hydroxy analog.
Agricultural economics
Biological sciences
Livestock
Mathematics
Pure sciences
Social sciences
G. M. Pesti
M. J. Gonzalez-Alcorta
مطالعه متن کتاب p
[Thesis]
276903
a
Y
