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Centro de Investigaciones Regionales Dr. Hideyo Noguchi, Universidad Autónoma de Yucatán

2001, Number 3

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Rev Biomed 2001; 12 (3)

Changes on rumen protozooa population induced by the inclusión of Canavalia ensiformis in cattle diets.

Sandoval-Castro CA, Herrera GF

Language: Spanish
References: 17
Page: 166-171
PDF size: 35.25 Kb.


ABSTRACT

Introduction. Canavalia ensiformis is a legume which stands out for its nutritional value. However, it also has several toxic compounds that limits its use. In vitro toxic effect of canavalia upon rumen protozoa has been reported but its in vivo toxicity is unknown. Objective. The objective of the present workt was to assess the changes of the rumen protozoa population when cattle are fed canavalia in their diet. Material and Methods. Four bulls (264.5 Kg live weight) fitted with rumen cannulae were used in a 2x2 crossover design with factorial arrangement. The animals were fed ad libitum with taiwan grass hay and canavalia or sorghum grain as a supplement (c. 27% of diet on dried mead base). Rumen liquour was collected after a 3-week adaptation period and the rumen protozoa were classified and counted. Data was analyzed after log10 transformation using a GLM procedure. Means were compared by the LSD test. Results. An increment was observed (p‹0.05) in the flagella population when the diets included canavalia (106.345 vs 105.247), but holotrics y entodinia were lowered (103.717 vs 104.364 y 104.407 vs 104.933 respectively p<0.05). The total protozoa numbers were higher with canavalia if flagella were included (106.369 vs 105.575) and lower if flagella were excluded (104.505 vs 105.093) (p‹0.05). Discussion. Changes in the protozoa population were an adaptative response to canavalia intake. Different protozoa groups seem to have different abilities to adapt/ and/or respond to the canavalia toxics.


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