Effect of Protein Intake on Nitrogen Retention by Swine during Late Pregnancy

Publisher Website
Google Scholar
Abstract
Nitrogen retention was determined for 19 gilts and 17 sows beginning 100 days post coitum. Average weights at 90 days post coitum were 158 kg. and 191 kg. for gilts and sows, respectively. Diets were formulated to contain levels of crude protein by varying the corn and soybean meal. Corn starch replaced a sufficient amount of corn to formulate the 6% protein diet. Sows and gilts were individually fed 1.9 kg. per day during a 10-day adjustment period and the 5-day collection period. Daily urine and fecal collections were made and representative samples were analyzed for N. At daily protein intakes of 114, 171, 228, 285 and 342 gm. per day, the mean daily N retentions in gm. were 4.23, 8.38, 12.37, 15.64 and 16.28 when the data for gilts and sows were combined. A significant (P<.01) linear increase occurred. Retention appeared to maximize between 15 and 18% protein, or 285 and 342 gm. of protein intake per day, but deviations from linearity were not significant. These data suggest that a daily intake of at least 285 gm. crude protein in such diets is necessary to supply sufficient essential amino acids and amino nitrogen for maximum nitrogen retention in the gravid gilt or sow at 100 days post coitum. Copyright © 1969. American Society of Animal Science . Copyright 1969 by American Society of Animal Science

This publication has 0 references indexed in Scilit: