1. Additional protein given to malnourished rats early in pregnancy was found to increase substantially the weight and cellularity of their foetuses and placentas at term.

2. This observation confirms the hypothesis that protein is stored in early pregnancy for use during the period of rapid foetal growth.

1. Carcass fat was determined by extraction with tetrachloroethylene and measurement of the solvent's change in density. The results were comparable in precision to those of a reference method; the new method extracted storage lipid but little structural lipid.

2. The technique is simple, rapid and appropriate for many nutritional studies.

1. In three series of experiments, Na235SO4 was infused into the rumen of sheep consuming a variety of diets. The specific activity of the sulphur in the rumen H2S pool, rumen bacteria and of the S in bacterial cystine were determined.

2. The results showed that, depending upon the diet, the proportion of total sulphur and cystine sulphur in rumen bacteria originating in the rumen H2S pool could be as low as 0.557 and 0.280 respectively.

1. The anabolic agent Trienbolone acetate (3-oxo-17-β-hydroxy-4,9,11-estratriene acetate) given subcutaneously to female rats increased their growth rate compared with untreated controls (P < 0.001).

2. The compound had little androgenic activity.

3. The fractional synthetic and fractional degradative rates of the mixed muscle proteins were smaller in the treated rats than in the control rats.