A study was conducted of grass selectivity shown by four herbivores on open range lands of Kenya Masailand. At four seasons over one year, wildebeest, zebra and kongoni (Coke's hartebeest) were taken. Stomach materials and faeces were sampled from each animal. Faecal samples were collected from cattle that had been grazing in the same area. Simultaneously, vegetation availability assessments were made.A comparison of techniques for determining the food selectivity indicates that faecal and stomach-content analyses provide similar results when the diets are almost entirely grass.The selectivity exhibited by the four herbivores was determined by faecal analyses. Three grass species were preponderant in all diets as well as in the available menu. In comparing the selectivity shown for the three dominant grasses there is a high degree of similarity even though statistical differences are demonstrated. All animals favoured Themeda triandru over PenniJetum mezianum and Digitaria macroblephara. Kongoni displayed the highest degree of selectivity and cattle and zebra had the greatest similarity in diets. Each animal species had a wide spectrum of grasses in their diets: these contained a greater number of species during the drier seasons than during the rainy seasons.

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In female rats dosed orally with 14C-hexachlorobenzene the extent of intestinal absorption of carbon-14 has been found to be dependent on the form of application. When the substance was given as a solution in oil about 80% of the dose administered was absorbed, but when given as an aqueous suspension only 6%. In animals treated with 14C-hexachlorobenzene dissolved in oil, all tissues contained radioactivity. Highest levels were found in adipose tissue, lowest in blood and muscle. Peak values of radioactivity were reached between 2 to 5 days after application. Elimination was studied after intraperitoneal application of 4 mg/kg14C-hexachlorobenzene dissolved in oil. Two weeks after administration, 34% of the radioactivity administered was recovered in the feces and 5% in urine. About 80% of carbon-14 excreted in feces and about 4% in urine was contained in the unchanged drug. This indicates that biodegradation of hexachlorobenzene in the rat is not insignificant. No radioactivity was detected in the expired air.

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