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Nutrient Content of Whole Cottonseed^*

¹ Department of Animal and Veterinary Science, Clemson University, SC 29634
² Texas Agricultural Experiment Station, The Texas A&M University, San Angelo 76901

Corresponding author: Jean A. Bertrand; e-mail: jbrtrnd{at}clemson.edu.

The objective of this study was to determine if the nutrient and gossypol contents and in vitro digestibility of 3 types of genetically modified whole cottonseed differed from traditional whole cottonseed. Samples of seed from traditional (no genetic modifications) and genetically modified varieties of cotton grown in 1999 and 2000 were analyzed. Genetic modifications included the insertion of genes to protect cotton from insect pests (Bt), and damage from glyphosate herbicides (RR), and from both (Bt/RR). Year effects were significant for in vitro dry matter (DM) digestibility, gossypol, DM, crude protein (CP), fat, neutral detergent fiber (NDF), acid detergent fiber (ADF), and ash. Higher rainfall resulted in higher CP, fat, and ash and lower NDF and gossypol. There were no differences among seed types for ground or whole seed digestibility, DM, CP, fat, NDF, ADF, ash, lignin, net energy for lactation, amino acids, total fatty acids, or seed index. Overall, the nutrient content and digestibility of varieties of genetically modified seed were similar to that of varieties of traditional whole cottonseed.

Key Words: whole cottonseed • genetically modified • gossypol • nutrient content

Abbreviation key: Bt = cotton varieties with the gene from Bacillus thuringiensis, Bt/RR = cotton varieties with both genes (Bt and RR), FA = fatty acids, IVDMD = in vitro dry matter digestibility, RR = glyphosatetolerant cotton varieties (containing the "Roundup Ready" gene), TRAD = traditional cotton varieties (no genetic modifications), WCS = whole cottonseed.