Effect of Protein Levels and Opaque-2 Corn on Sow Milk Composition1

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Abstract
Very little data have been reported on the influence of dietary protein levels and sources on sow milk composition. Of the work that has been conducted with swine, Salmon-Legagneur (1964) found no significant differences in the nitrogen constituents of sow milk when 14 or 19% dietary protein was fed, except for lactalbumin and urea, in which case both constituents were higher with the 19% protein diet. When animal protein sources (tankage or fish solubles) were substituted for plant protein (soybean meal), Sherry et al. (1952) found no treatment effects on the total protein or casein content of colostrum, 15- or 30-day milk. Increasing the protein content of the diet of dairy cattle results in an increase in the nonprotein nitrogen (NPN) fraction of the milk, particularly urea (Perkins, 1930). The NPN content of cow, goat and ewe milk comprises approximately 5 to 7% of the total nitrogen (Perkins, Krauss and Hayden, 1933); whereas, Perrin (1958) reported values in swine of approximately 14%. Copyright © 1971. American Society of Animal Science . Copyright 1971 by American Society of Animal Science.