Abstract
Feed is the most expensive component in raising agricultural animals such as pigs in the United States Guar meal is the main by-product from the guar gum production from guar (Cyamopsis tetragonoba) seed. Although said to be unpalatable and possibly toxic, the recently improved products possess promise to be alternative protein-providing feedstuffs for animal industries, primarily because they contain great amounts of protein and are inexpensive. This study was conducted to mainly evaluate the amino acid profile of GuarPro F-81, a newly developed guar meal product in India. Three samples were randomly collected from a production company in India and aliquoted to multiple sub-samples (20 to 200 g/sub-sample), after received, for nutrient evaluation in 2 to 7 laboratories. Results showed that GuarPro F-81 contained (as-fed basis, ±SD) 97.1 ± 1.92% dry matter (n = 7), 57.9 ± 1.29% crude protein (n = 7), 7.17 ± 0.38% crude fat (n = 5), 3.24 ± 1.06% crude fiber (n = 4), 4,440 ± 622 kcal/kg gross energy (n = 2), and 5.40 ± 0.43% ash (n = 5). The amino acid contents (as-fed basis, ±SD, n = 3) were 2.30 ± 0.102% lysine, 0.61 ± 0.032% methionine, 0.68 ± 0.029% cysteine, 1.57 ± 0.009% threonine, 0.80 ± 0.048% tryptophan, 7.43 ± 0.149% arginine, 3.10 ± 0.064% leucine, 1.70 ± 0.095% isoleucine, 1.99 ± 0.073% valine, 1.42 ± 0.075% histidine, 2.14 ± 0.030% phenylalanine, 1.53 ± 0.352% tyrosine, 2.79 ± 0.027% glycine, 2.40 ± 0.190% serine, 1.85 ± 0.108% proline, 2.04 ± 0.015% alanine, 11.14 ± 0.268% glutamic acid, and 5.53 ± 0.096% aspartic acid. While the contents of alanine, cysteine, tyrosine, methionine, valine, phenylalanine, leucine, threonine, isoleucine, lysine, and proline were approximately 0.9 to 27% less than that in soybean meal (a dehulled, solvent extracted product), the contents of serine, aspartic acid, histidine, tryptophan, glutamic acid, glycine, and arginine were approximately 1.8 to 115% higher than those in soybean meal, and so was the crude protein content which was approximately 21.3% higher. While the crude fiber content was approximately 17% less, the crude fat and gross energy contents were approximately 372% and 4% higher than that in soybean meal, respectively.
Amino acid digestibility in soybean meal sourced from different regions of the United States and fed to pigs1
