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University of Arizona (1966)

The botanical composition of steer diet on a semidesert range

Galt, Henry Deloss

Titre : The botanical composition of steer diet on a semidesert range

Auteur : Galt, Henry Deloss,

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1966

Résumé
A knowledge of the botanical composition of the grazing ani= mal’s diet would contribute greatly to the field of range nutritione Recently, fistulated animals have been used in range nutritional studies 0 The objective of this experiment was to develop a method for identifying plant species in rumen contents. The steer’s diet was investigated by the ocular estimate and the analyses of rumen contents by the microscope point method. The microscope point method consists of identifying the plant species by a random number of points taken on rumen contents. Rumen samples of known composition were examined by the microscope point method to establish regression equations for converting percent points to percent weight, A sample size of i|00 points estimated plant species of rumen contents to within approximately 10 percent weight of a species at the 90 percent confidence level. The botanical composition of the diet varied both qualitatively and quantitatively with the time of the year, A great difference existed between the botanical composition of the pasture and the rumen samples. The ocular estimate was only a general estimate of the animal’s diet and the microscope point method estimated the botanical composition of the diet with a reliable degree of accuracy, ..

Mots clés : Cattle — Feeding and feeds. ; Forage plants — Arizona.

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