Response of crickets to amount of forage in the diet.

Three replicated tests were to define the conditions needed to use house crickets (Acheta domesticus) to evaluate forages. Crickets were placed on various proportion of forage-to-concentrate mixtures to determine the relative proportions best suited for cricket survival, growth, and maturity. The concentrate portion alone was adequate to support nominal cricket performance.

Interactions of cadmium with copper, iron, zinc, and manganese in ovine tissues.

Diets containing 0, 5, 15, 30, and 60 ppm of cadmium were fed to male lambs for 191 days to ascertain what effect cadmium might have on the tissue concentrations of copper, zinc, iron, and manganese. The cadmium content of all tissues increased with an increase in dietary cadmium. The iron concentration of the ileum tissue was significantly depressed in the cadmium-treated groups compared with that of the controls.

Effects of cadmium on the growth and uptake of cadmium by microorganisms.

Six species of microorganisms, Escherichia coli, Bacillus cereus, Lactobacillus acidophilus, Staphylococcus aureus, Streptococcus faecalis and Actinomyces niger, were grown under suitable conditions in appropriate media. Cadmium chloride was added to provide 0, 5, 10, 20, 40, and 80 mug of Cd per ml. At 40 and 80 mug of Cd per ml, E.

Utilization of nitrogen from soybean meal, casein, zein, and urea by mature sheep.

The utilization of nitrogen contained in soybean meal, casein, zein, and urea was studied in 12 mature wethers. Net microbial synthesis rates during the 6-hour period after feeding corresponded to ruminal ammonia concentrations, suggesting that the ruminal ammonia level in these experiments was a limiting factor in microbiol protein synthesis. Maximum conversion of dietary nitrogen to microbial nitrogen in the rumen during a 24-hour period was estimated to be 62.