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Title: Digestibility of glandless cottonseed protein in diets for pacific white shrimp, litopenaeus vannamei

Author
item SICCARDI,III, ANTHONY - Texas A&M Agrilife
item RICHARDSON, CRISTINA - Texas A&M Agrilife
item Dowd, Michael
item WEDEGAERTNER, TOM - Cotton, Inc
item HOLMES, KELSEY - Texas A&M Agrilife
item SAMOCHA, TZACHI - Texas A&M Agrilife

Submitted to: Journal of the World Aquaculture Society
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 6/17/2015
Publication Date: 2/1/2016
Citation: Siccardi,III, A.J., Richardson, C.M., Dowd, M.K., Wedegaertner, T.C., Holmes, K.A., Samocha, T.M. 2016. Digestibility of glandless cottonseed protein in diets for pacific white shrimp, litopenaeus vannamei. Journal of the World Aquaculture Society. 47(1):97-106.

Interpretive Summary: This report discusses the ability of white shrimp to utility the energy, lipid, and protein content of various cottonseed products prepared from glandless seeds. The work shows that cottonseed proteins can be used as a partial replacement for more expensive fish meal proteins that are in diminishing supply. The work also suggests that some fish oil may be replaced with cottonseed oil. The work should be of interest to cottonseed processers and researchers and the shrimp industry.

Technical Abstract: Accurate digestibility coefficients for protein, energy, and lipid are needed by feed formulators to optimize diets to meet nutritional requirements and to substitute ingredients cost-effectively. Of particular interest is protein, which accounts for the majority of shrimp feed content and expense. The current study evaluated seven different cottonseed meals and protein products. Most of the samples were derived from a glandless cotton variety that lacks significant levels of the antinutritive compound gossypol. The various protein fractions were evaluated for apparent crude protein, crude lipid, and energy digestibility when fed to juvenile Pacific White Shrimp (Litopenaeus vannamei). The study was conducted in a 21 tank (0.2 m2) indoor semi-closed (25% new water daily) recirculating system at a stocked density of 20 shrimp per tank with three replicates per treatment. The digestibility trial followed the chromic oxide indicator method (70% reference diet/30% test ingredient). Apparent energy digestibility for the protein fractions derived from the glandless seed ranged from 76.7% for ground kernels to 94.6% for protein isolate, and these values were greater than the value obtained for the cottonseed meal prepared from the glanded seed (64%). Apparent protein digestibility for the six glandless-cotton-based samples varied from 72.3% for the ground full-fat kernels to 94.1% for the protein isolate, and these values were mostly higher than the value obtained for the regular cottonseed meal (82.3%) containing a typical level of gossypol. The high apparent digestibility values demonstrate that cottonseed protein products may be utilized as a cost-effective replacement for more expensive protein sources in L. vannamei diets.