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| Articles
by
R. Ekmay |
Total Records (
1 ) for
R. Ekmay |
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C. Salas
,
R. Ekmay
,
J. England
,
S. Cerrate
and
C.N. Coon
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Cotton seed meal (CSM) is an alternative ingredient in poultry
diets but its use is limited due to the presence of gossypol and the potential
effects of gossypol on digestibility of nutrients. Glandless cottonseed is available
and contains very low gossypol but there has been a limited amount of poultry
nutritional studies completed with glandless cottonseed meal (GCSM). The TMEn,
proximate analysis, amino acid content and amino acid (AA) digestibility of
a glandless (GCSM) and a commercial (CCSM) cottonseed meal were determined with
broilers. Thirty 42-day old Cobb 500 male broilers were precision-fed 30g of
CCSM, GCSM and glucose and excreta collected during a 48 h period. Glucose was
fed to serve as a control (no nitrogen or AA content). The chemical composition,
gossypol content, True metabolizable energy (TMEn) and digestibility coefficients
for AA were calculated for both meals. The crude protein and fat content of
GCSM was higher than the CCSM (54 and 51%, 6 and 2%, respectively). Both meals
were similar in calcium, total phosphorus and phytic acid contents. The CCSM
had a higher content of total and free gossypol (1.52 and 0.161%, respectively)
when compared to GCSM (0.02 and .003%, respectively). The TMEn for the GCSM
provided approximately one thousand kcal more per energy/ kg than the CCSM.
The essential AA content (g/kg; 90% DM) was determined for both cottonseed meals
and was generally higher for GCSM compared to CCSM but both types of CSM contained
higher levels of key essential AA than reported values for AA in the literature.
The most extreme differences were for methionine and cystine; % methionine content
was approximately 2 fold higher than values in the literature and the % cystine
was 74 to 93% higher. The true digestibility coefficients for essential AA ranged
from the low of 73.9% for isoleucine to 91.8% for arginine, for CCSM; the amino
acid digestibility coefficients for GCSM were all higher than 90% for the essential
AAs. |
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