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| New Glyphosate-Tolerant Soybean Feeding
Study Monsanto Company has developed a new glyphosate-tolerant soybean (MON 89788), which will replace the original source of genetic material (A3244) that provided weed control in RoundUp Ready? soybeans. A 42-day feeding study was conducted with broiler chicks comparing soybean meals produced from MON 89788 and six conventional soybean varieties. The design of the experiment included eight dietary treatments, five replications, and 16 pens with ten birds per pen. No treatment differences (P>0.05) were observed among the dietary treatments for feed intake, weight gain, feed conversion, carcass and meat quality measurements between the birds fed the soybean meals produced from MON 89788 or the six conventional soybean sources. They concluded that soybean meals produced from the new glyphosate-tolerant soybean were nutritional equivalent to meals produced from traditional conventional soybeans. Taylor, M.L., and co-workers. 2007. Comparison of broiler performance and carcass parameters when fed diets containing soybean meal produced from glyphosate-tolerant (MON 89788) control or conventional reference soybeans. J. Animal Sci. 85: Suppl. 1: 71 (Abstract M212). Feeding Glycerol a Biodiesel Co-product Several papers were recently reported on the feeding value of glycerol/glycerin, a co-product of biodiesel fuel production. To briefly review, fats and oils are composed of a triglyceride that contains three fatty acids attached to a glycerol molecule. During biodiesel production, the fatty acids are split off to become methyl esters, leaving the glycerol molecule. In the past glycerol has been used in the manufacture of personal care products, several industrial uses and food/feed products. Greater supplies of glycerol are anticipated with the increasing interest in biodiesel production; therefore researchers are interested in investigating its feeding value. Researchers at the University of Arkansas evaluated the use of glycerol from biodiesel production as an energy source in the diet of growing broilers. Two experiments were conducted with graded levels of glycerol fed to broilers grown to 42-days in litter pens. Results indicated that feeding 2.5 or 5 percent glycerol had no effect on growth rate or feed conversion compared to birds fed no glycerol. Birds fed ten percent glycerol consumed significantly less feed and had reduced body weight. In one experiment, birds consuming diets with 2.5 or 5 percent glycerol had significantly greater breast yields as a percent of the dressed carcass. In these experiments, glycerol was assigned a metabolizable energy value of 3527 ME kcal/kg. Cerrate, S., and co-workers. 2006. Evaluation of glycerin from biodiesel production as a feed ingredient for broilers. International J. Poultry Sci. 5(11): 1001-1007. Iowa State researchers conducted a 138-day study with eight kg pigs to evaluate the effects of feeding crude glycerol on growth performance and carcass characteristics. In this study, pigs were fed 0, 5 or 10 percent added to a corn-soybean diet. Results indicated no significant differences in average daily weight gains, average daily feed intake, feed efficiency or carcass composition. In this study, glycerol was assigned a metabolizable energy value of 3640 ME kcal/kg. Lammers, P.J., and co-workers. 2007. Growth performance and carcass characteristics of growing pigs fed crude glycerol. J. Animal Sci. 85: Suppl. 1: 508 (Abstract W142). Another study was reported to determine the nitrogen-corrected apparent metabolizable energy (AMEn) content of crude glycerol when fed to laying hens. Four experimental diets were formulated by substituting 0, 5, 10, or 15 percent crude glycerol for glucose in a corn-soybean meal-glucose-meat meal basal diet. Feed consumption, egg production, egg weight, egg mass or feed utilization was not significantly affected by treatment in this 10-day experiment. They calculated that the crude glycerol contained 3805 kcal/kg AMEn. This value is about 15 percent higher than corn and less than one-half the value reported for vegetable oil. Bregendahl, Kristjan, and co-workers. 2007. Metabolizable energy value of crude glycerol for laying hens. J. Animal Sci. 85: Suppl. 1: 69 (Abstract M205). |
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