Journal of Animal Science, Vol 71, Issue 1 11-17, Copyright © 1993 by American Society of Animal Science

JOURNAL ARTICLE

Interaction of whole cottonseed and supplemental fat on digestive function in cattle

R. A. Zinn and A. Plascencia
Department of Animal Science, University of California, El Centro 92243.

Four Holstein steers (155 kg) with "T" cannulas in the rumen and proximal duodenum were used in a 4 x 4 Latin square design experiment to evaluate the interaction of whole cottonseed (WC) and yellow grease (YG) on digestive function. Four treatments were compared: 1) 0% YG, 0% WC; 2) 5% YG, 0% WC; 3) 0% YG, 20% WC, and 4) 5% YG, 20% WC. The YG and WC were substituted for steam-flaked corn in an 80% concentrate growing-finishing diet. Both YG and WC decreased ruminal OM digestion (P < .01). However, the effects were not additive (interaction, P < .05). When YG was added to the control diet ruminal OM digestion was decreased by 6.9%. In contrast, when YG and WC were added to the control diet the decrease was 24.0%. This interaction was also apparent (P < .05) in ruminal digestion of feed N and starch. Total tract digestion of OM was decreased (P < .01) with WC and YG supplementation, although, like ruminal digestion, the effects were nonadditive (P < .05). In the absence of WC, YG had little influence (.8%) on OM digestion. However, in the presence of WC, YG decreased total tract OM digestion 5.7%. This interaction was also manifest (P < .05) in total tract digestion of ADF and GE. Although there was some compensation with respect to methane energy loss, the ME (megacalories/kilogram) of WC was 20% lower when fed in combination with YG. The degree of ruminal biohydrogenation of unsaturated fatty acids was high for both WC and YG.(ABSTRACT TRUNCATED AT 250 WORDS)

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