Resumo

KOZA, G.A. et al. Efectos del consumo de distintos niveles de semilla de algodón sobre las variables ruminales de novillos cruza cebú. Rev. vet. [online]. 2015, vol.26, n.1, pp.3-12. ISSN 1669-6840.

Cottonseed (SA) constitutes an important alimentary resource for livestock from Argentinean northeast due to its low cost and high nutritious level. The objective of this work was to verify the changes in the ruminal environment induced by the inclusion of SA, due to its high lipid concentration. Using a balanced latin square design, four half-bred zebu steers with ruminal fistula were used, which were fed on Cynodon nlemfuensis hay and supplemented with different levels of SA, constituting the treatments: low (0.6 kg), medium (1.2 kg), high (1.8 kg) and zero (without SA). The experience lasted 84 days (four periods of 21 days each). The consumption of hay was registered. Rumen samples were extracted at different times post-suplementación to determine pH, volatile fatty acids (AGV) and protozoa. Statistical calculations included descriptive parameters, repeated measures, orthogonal contrasts (lineal, quadratic and cubic effects) and means comparison. It is concluded that total concentration of AGV was not affected, but propionate increase, acetate decrease, and invariability of the isobutirate were verified. Butirate raised for the low and medium levels. Valerate and isovalerate increased due to the supplementation of SA. Caprionate decreased in the high treatment, but increased in the low level. Ruminal ammonium registered a lineal elevation parallel to the quantity of ingested SA; the pH didn't vary in any treatment. Total protozoa diminished in function to the increment of SA. Entodinium prevailed in all the treatments, Dasytricha, Isotricha and Ostracodinium prevailed in zero, Diplodinium in low and medium levels

Palavras-chave : half-bred zebu steer; cottonseed; ruminal pH; volatile fatty acids; protozoa.

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