QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Purchase Article View Shopping Cart Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Firth, J. Articles by Johnson, B. C. Search for Related Content PubMed PubMed Citation Articles by Firth, J. Articles by Johnson, B. C.

Quantitative Relationships of Tryptophan and Nicotinic Acid in the Baby Pig¹

One Figure

Division of Animal Nutrition, University of Illinois, Urbana

The relationship between the requirements of the baby pig for L-tryptophan, DL-tryptophan and nicotinic acid were studied using a hydrolyzed casein synthetic milk diet containing 28% of protein.

1. The requirement of the baby pig for DL-tryptophan is approximately 0.29% of the dry matter of the diet when an excess of nicotinic acid is present.

2. The requirement of the baby pig for L-tryptophan in the presence of an excess of nicotinic acid is 0.19% of the dry matter of the diet. The difference between the L and DL requirements implies that about of the unnatural isomer can be used for growth.

3. The nicotinic acid requirement for maximum growth is near 20 mg per kilogram of diet when 0.3% of DL-tryptophan is present in the diet.

4. The DL-tryptophan requirement is increased to approximately 0.45% of the diet when nicotinic acid is absent.

Manuscript received 5 December 1955.