Abstract
ABSTRACT The aim of this study was to evaluate the effect of diets containing whole cottonseed (WC) on blood biochemical parameters of bulls. Thirty bulls with 30±6 months and 382.7±28.4kg were kept in feedlot (85 days) and fed the following WC levels: 0, 2.22, 4.44, 6.66, 8.88 and 11.11%. In comparing biochemical indicators from the beginning to the end of the experiment, the control group (CG) and those fed diets containing 2.22, 8.88 and 11.11% of WC had an increase (P<0.05) in serum Ca concentrations (8.34±0.65−9.56±0.92mEqL-1). In relation to Fe (202.79±69.04−300.04±79.88µg/dL), the CG and those treated with 6.66% WC showed an increase (P<0.05) in serum concentrations. As to the Mg (1.92±0.18−2.40±0.27mEqL-1), groups treated with diet containing 2.22, 4.44 and 6.66% of WC had higher (p<0.05) concentrations at the end of the study. Regarding blood lipids, groups with diets containing 2.22; 4.44; 6.66 and 8.88% of WC increased (p<0.05), respectively, in concentrations of HDL, TG, VLDL and COL. The group that received 11.11% of WC increased (P<0.05) in the concentrations of COL and HDL. It can be concluded that diets containing WC, caused no alterations in the concentrations of blood parameters analyzed in this study, with the exception of Mg.
Highlights
The aim of this study was to evaluate the effect of diets containing whole cottonseed (WC) on blood biochemical parameters of bulls
The use of cottonseed in ruminant feeds has aroused great interest, mainly because it is an important source of energy, proteins and supplemental to fodder
The main problem that has limited the use of cottonseed in ruminant feeds is the presence of gossypol, which is a toxic polyphenol found naturally in the pigment glands of whole cottonseed
Summary
The use of cottonseed in ruminant feeds has aroused great interest, mainly because it is an important source of energy, proteins and supplemental to fodder. The high energy content, attributed to the oil found in oilseeds, is one of the limitations to the use of cottonseed, because the excess of unsaturated fatty acids may cause changes in ruminal fermentation, due to suppression of cellulolytic bacteria and methanogenic activities (Van Soest, 1994). The main problem that has limited the use of cottonseed in ruminant feeds is the presence of gossypol, which is a toxic polyphenol found naturally in the pigment glands of whole cottonseed. The factors that predispose ruminants to gossypol toxicity are: age, duration of intake, rumen function and protein and mineral contents of the feed. For signs of gossypol poisoning to happen it is necessary that its intake occurs for several weeks or months, because the effect is cumulative (Rogério et al, 2003)
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