Off-campus UNL users: To download campus access dissertations, please use the following link to log into our proxy server with your NU ID and password. When you are done browsing please remember to return to this page and log out.
Non-UNL users: Please talk to your librarian about requesting this dissertation through interlibrary loan.
BASIC PROTEIN METABOLISM IN RUMINANTS
Abstract
The concept of feeding rumen degradable protein with either urea, soybean meal (SBM) or a combination urea and blood meal (BM) was investigated. Daily gain of mid-gestation cows was not improved by supplementation of SBM or a combination of urea and dried delactosed whey (DDW) compared to an all urea supplement. When protein was limiting in a heifer growth trial, heifers supplemented with urea, BM and condensed liquid whey (CLW) gained slightly faster than heifers supplemented with urea and BM although differences were not significant. In a lamb growth trial, lambs fed (ad libitum) diets supplemented with a combination of urea and either DDW or casein had increased daily gains (P < .01), feed intakes (P < .005) and gain/feed ratios (P < .05) compared to lambs fed a diet supplemented with urea alone. In a second lamb growth trial and a steer growth trial, animals supplemented with urea-DDW gained faster and more efficiently than animals fed urea alone. Animals fed SBM-urea or SBM-DDW gained faster and more efficiently than animals fed urea or urea-DDW. In a third lamb growth trial and a second steer growth trial, the relative value of BM compared to SBM was 251% to 348% depending on type of experimental design and method of data analysis used. In a steer abomasal trial, supplementation of urea-DDW to a 30% solka floc diet compared to urea supplementation alone, increased abomasol flows of nonammonia nitrogen (NAN), bacterial N and total amino acids. Supplementation of urea-DDW to a 30% corn starch diet compared to urea supplementation alone increased amino acid flow, but did not affect NAN flow or bacterial N flow. In a second steer abomasol trial, supplementation of urea-DDW compared to urea alone increased NAN flow, bacterial N flow (P < .10) and total amino acid flow (P < .06). Supplementation of BM-urea-DDW compared to BM-urea increased total amino acid flow. In a lamb rumen fermentation trial, supplementation of urea-DDW compared to urea alone, increased bacterial growth (P < .05) and increased molar proportions of iso-butyrate (P < .01), iso-valerate (P < .01) and valerate (P < .01).
Subject Area
Agricultural education
Recommended Citation
STOCK, RICK ALLEN, "BASIC PROTEIN METABOLISM IN RUMINANTS" (1982). ETD collection for University of Nebraska-Lincoln. AAI8227044.
https://digitalcommons.unl.edu/dissertations/AAI8227044