1. Dept. of Food Technology, Escuela de Ciencias Aplicadas del Mar; Univ. de Oriente, Núcleo Nueva Esparta; Isla de Margarita 6301 Venezuela
2. Dept. of Animal Science, Texas A&M Univ., 338 Kleberg Center; College Station TX 77843-2471 USA
3. Dept. of Statistics, Texas A&M Univ., Blocker Bldg; College Station TX 77843-3143 USA
4. Dept. of Molecular and Human Genetics, Baylor College of Medicine; Houston TX 77030 USA
5. Dept. of Nutrition and Food Science, Texas A&M Univ., 122 Kleberg Center; College Station TX 77843-2253 USA