Nitrogen utilization by lambs fed wheat straw alone or with supplements containing dried poultry waste, cottonseed meal or urea
Three male lambs were used in a 3 x 3 latin square to determine utilization of N from diets containing wheat straw supplement with dried poultry waste (DPW) cottonseed meal (CSM), or urea. Supplements formulated from the three N sources provided 85% of the total dietary N. The DPW and CSM provided over 90% and urea over 70% of the N in their respective supplements. Daily intakes of total dry matterl straw dry matter, and N were not affected by the source of the supplemental N. Apparent digestibility of N was higher for the urea-supplemented diet (74%) than for DPW (68%) or CSM (67%) diets. Daily urinary N excretion was highest on the urea diet. (16 g) followed by DPW (14 g) and CSM (11 g) diets. Approx. 35% of the absorbed N was retained on the CSM diet compared with 16% for DPW and urea diets. Upon completion of the latin square, the lambs were fed only wheat straw for 70 days. N balances were determined after 10, 28, and 63 days. Daily intakes of straw dry matter and N were similar for all 3 collection periods. Although the lambs were in negative N balance throughout this unsupplemented phase, the degree of negativity decreased in each succeeding collection period.
- Research Organization:
- Univ. of Arizona, Tucson
- OSTI ID:
- 5545158
- Journal Information:
- J. Anim. Sci.; (United States), Journal Name: J. Anim. Sci.; (United States) Vol. 45:6; ISSN JANSA
- Country of Publication:
- United States
- Language:
- English
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60 APPLIED LIFE SCIENCES
AGRICULTURAL WASTES
AMIDES
ANIMAL FEEDS
ANIMALS
CARBONIC ACID DERIVATIVES
CEREALS
CLEARANCE
COTTON
CRYOGENIC FLUIDS
DIET
DOMESTIC ANIMALS
ELEMENTS
EXCRETION
FLUIDS
FOOD
GRAMINEAE
GRASS
INTESTINAL ABSORPTION
MAMMALS
MANURES
METABOLISM
NITROGEN
NONMETALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PLANTS
RUMINANTS
SHEEP
SOLID WASTES
STRAW
UPTAKE
UREA
VERTEBRATES
WASTES
WHEAT