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Diet determination of cattle grazing in the Sanyati communal areas in Zimbabwe

Published online by Cambridge University Press:  27 February 2018

Hanne H. Hansen
Affiliation:
Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University (KVL), Gronnegårdsvej 2, 1870 Frederiksberg C, Denmark
Jørgen Madsen
Affiliation:
Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University (KVL), Gronnegårdsvej 2, 1870 Frederiksberg C, Denmark
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Summary

The diet of cattle grazing in the Sanyati communal area, Zimbabwe was determined using plant particle identification from faeces from intact animals, and faeces and oesophageal extrusa from fistulated animals. A total of 130 plant genus, species and types were identified. The twenty most frequently occurring species in the samples comprised between 76 and 90% of the identifiable diet. The most frequent grass species were more than half of the identified diet in the dry season while they were half or less of the identified diet in the wet season. There were more plant species identified in the wet season than in the dry season. Significant differences were found when comparing the plant species identified in faeces to those in oesophageal extrusa from fistulated animals. This may be due to incomplete recovery of ingesta in the bags, or to the loss of identifiable particles in the faeces when compared to oesophageal extrusa because of digestibility. More research is needed to validate the use of oesophageal extrusa for diet botanical determination.

Resumen

Resumen

La dieta de bovinos pastoreando en el area comunal de Sanyati, Zimbabwe fue determinada empleando la técnica de identificación de partículas de plantas (técnica microhistológica) en las heces de animales intactos y en las heces y extrusa esofágica de animales con canula esofágica. Se identificaron un total de 130 géneros de plantas, especies y variedades. Las veinte especies más frecuentes en las muestras representaban entre el 76 y 90% de la dieta identificable. Las especies de gramíneas más frecuentes representaron más de la mitad de la dieta identificada durante la época de sequía, mientras que en la época lluviosa representaron menos de la mitad de la dieta. Se identificaron más especies en la época de lluvia que en la época seca. Se encontraron diferencias significativas al comparar las especies identificadas en las heces y aquellas identificadas en la extrusa esofágica de los animales canulados. Esto pudiera ser debido a una recuperación incompleta de la ingesta en las bolsas, ó a la pérdida de particulas identificables en las heces, cuando se compara con la extrusa esofágica, debido al efecto de la digestibilidad. Se requiere más investigación para validar el uso de la extrusa esofágica como herramienta para la identificación botánica de la dieta.

Type
Research Article
Copyright
Copyright © British Society of Animal Science 2006

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References

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