Amino Acid Profile of Guarpro F-71, a Potential Protein Source for Swine and Other Agricultural Animals in the United States

The growth of world population increases the requirement of food and feed for human and animal consumption. High feed cost is a major factor limiting the profitability of animal production in the U.S. Guar meal is the main by-product from the production of guar gum from guar (Cyamopsis tetragonoba L.) seed. Although said to be unpalatable and possibly toxic, the improved new guar meal products possess promise to be alternative protein-providing feedstuffs for animal industries, mainly because they contain great amounts of protein and carbohydrates, and are inexpensive. This study was conducted to mainly evaluate the amino acid (AA) profile of GuarPro F-71, a newly developed by-product from guar gum production in India. Four samples of GuarPro F-71 were randomly collected from the production line of Shree Ram Industries (Rajasthan, India) and aliquoted to multiple sub-samples (20 to 200 g/sub-sample) after being received for nutrient evaluation in 2 to 7 laboratories. Results showed that GuarPro F-71 contained (as-fed basis; ± SD) 95.3 ± 1.20% dry matter (n = 7), 58.6 ± 1.76% crude protein (n = 7), 6.47 ± 1.54% crude fat (n = 5), 4.21 ± 1.91% crude fiber (n = 4), and 5.26 ± 0.40% ash (n = 5). The gross energy content (as-fed basis; ± SD) was 4301 ± 45.1 kcal/kg (n = 2). The AA contents (as-fed basis; ± SD; n = 3) were 2.42 ± 0.048% lysine, 0.64 ± 0.022% methionine, 0.71 ± 0.032% cysteine, 1.60 ± 0.028% threonine, 0.86 ± 0.032% tryptophan, 7.88 ± 0.093% arginine, 3.24 ± 0.054% leucine, 1.77 ± 0.081% isoleucine, 2.08 ± 0.057% valine, 1.51 ± 0.062% histidine, 2.24 ± 0.024% phenylalanine, 1.51 % ± 0.326 tyrosine, 2.82 ± 0.013% glycine, 2.49 ± 0.212% serine, 1.93 ± 0.146% proline, 2.04 ± 0.020% alanine, 11.65 ± 0.288% glutamic acid, and 5.72 ± 0.095% aspartic acid. While the contents of leucine, threonine, isoleucine, lysine, and proline were approximately 10 to 24% less than that in soybean meal (i.e., a common dehulled, solvent extracted product), the contents of histidine, tryptophan, glutamic acid, glycine, and arginine were approximately 18 to 128% higher than those in soybean meal, and so was the crude protein content which was approximately 23% higher. The contents of other AAs were similar (< ± 7%) between GuarPro F-71 and soybean meal. This project was supported by USDA Hatch/Multistate Project 1007691.