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The protein and energy requirements of pre-weanling dairy calves were studied through the use of growth and balance trial techniques. Various levels of protein and energy were fed in both purified and semi-purified diets. The nitrogen retention of calves fed diets adequate in protein was 3.22 gm. per 100 gm. of gain in body weight. Energy requirement for maintenance was 44.7 digestible Calories per kg. of body weight per day and 268 digestible Calories were required per 100 gm. of gain in weight. These factors, along with previously determined values for endogenous nitrogen, were used to calculate the practical digestible energy and apparent digestible protein requirements of dairy calves.

Two experiments were conducted to measure voladle fatty acids -and lactic acid in the alimentary tract of pigs. The animals had been fed either a cellulose-, bran-or dried whey-supplemented diet before slaughter.The cellulose-supplemented di# generally g ve a lower lotal organi-c acid content than did the control diet. for each section of the tract examined.A high concentration and large quantiry of organic acid characterized the colon of the pig.In the secoridexoeriment. where the control diet was supplemented with either bran or drieh whey, iormic acid was found only in the stomach and small intesdne of each pii. Lactic acid in the laree iniestine was found less often in the bran-fed pisi than it was in the piss fed the other two diets.The digesta of the iriall intestine gave th6 l-owest (P < 0.01) total concentratioi (meq./100 ml.) of oreaniE acid. The concentration of acid in the caecum of tlie control pigs wi nearly twice that reported for the caecum of catde.The proportion of lactic acid decreased progressively as the digesta passed aion'g the tracq the differences being liishly significant (P < d.0l) between the upper sections (stomach and smlll inte'stine) and lower sections (caecum and colon). There was a tendency for the bran-fed pigs to have e greater proportion of acetic acid in the dlgesta than the controls.. Ageti,c' propionic'an

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