Table 16. Mean values for chemical, biochemical,
 evaluations of mature grain samples from 15
 varieties.


and preference
bird-resistant


 Group
 Test Unit I II III

Protein precipitation Tannic acid equiv. 1.60 1.85 2.58

Vanillin Catechin equiv. 0.11 0.07 0.83

Folin-Denis Catechin equiv. 0.46 0.26 1.20

Leucoanthocyanin Cyanidin equiv. 0.11 0.07 0.83

Vanillin/Folin-Denis % 10.4 10.0 39.1

Vanillin/Leucoanthocyanin % 39.8 40.0 58.0


Chromatogram area % tannin 33.0 15.5 63.9


Preference % consumption 46.0 46.3 22.3


A comparison of sorghum varieties from groups II and III (Table 17)
indicates that they are chemically comparable during the immature
stages and quite different during the mature stage. These facts, plus
the known nutritional qualities of group-II sorghums indicate the
possibility of finding sorghum varieties that are bird resistant
during the immature stages and then mature to a highly nutritional
grain product.

A wide variety of compounds were extracted from the 15 sorghum
varieties examined in these studies. Only one variety (WGF from
Oklahoma State University) contained all the compounds. Hence, it
was selected for fractionation and evaluation of each fraction by the
tests discussed previously.