Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"N balance"”.
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Excess leucine in diets for growing pigs negatively affects growth performance, nitrogen balance, and metabolism of branched-chain amino acids and tryptophan
… of excess dietary Leu on growth performance, N balance, protein retention, and serotonin synthesis of growing pigs. Results indicated that average daily gain (ADG), average daily feed intake (ADFI), and gain to feed ratio decreased (linear, P < 0.05) as dietary Leu increased. Decreased (linear, …
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White clover inclusion in intensive dairy production systems
… dairy cow rumen function and overall farm gate N balance were investigated. White clover inclusion increased herbage production at fertiliser application rates of up to and including 180 kg N/ha/year in the plotbased study described in chapter 4 of this thesis. The results from this demonstrated …
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A Comparative Analysis of Sorghum and Maize as Bioenergy Feedstock for the US Midwest: Compositional Attributes and System Nitrogen Dynamics
… the hybrids/lines. A related study of system N balance, specifically focused on N removal in harvested tissue and N loss to subsurface drainage water, was conducted at Purdue University’s Water Quality Field Station. The study compared continuous residue removal systems of sorghum and maize to …
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Nitrogen Metabolism in Bos indicus and Bos taurus Cattle Consuming Low-quality Forages
… supplementation raised N excreted and N balance for both subspecies; fecal N was greater in Bt, while urinary N was greater in Bi.
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Optimization of Biological Nitrogen Removal From Fermented Dairy Manure Using Low Levels of Dissolved Oxygen
… in fermented dairy manure. Furthermore, an N balance during the aerobic zone indicated that simultaneous nitrification-denitrification (SND) was occurring in the aerobic zone of the N removal reactor and was most apparent at DO concentrations below 1.3 mg/L. A series of nitrite generation rate …
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Estimating Soil Nitrogen Supply and Fertilizer Needs for Short-Rotation Woody Crops
… but simple models of soil N supply and an N-balance approach may improve prescriptions.
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Lowering ruminally degradable protein in lacatating dairy cow diets
… a trend for a linear decrease in total body N balance, but no significant effects on calculated ruminal N balance as dietary RDP decreased. Linear reductions in microbial N leaving the rumen were due to decreased ruminal NH₃-N as peptides plus amino acids and energy supply were unaffected. The …
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Determination of Energy Efficiency of Beef Cows under Grazing Conditions Using a Mechanistic Model and the Evaluation of a Slow-Release Urea Product for Finishing Beef Cattle
… performance and carcass characteristics and 2) N balance of finishing cattle. Steers had lower initial F:G when SRU was used as the only source of feed N (treatment 3), suggesting that SRU may replace both NPN and true protein feeds in finishing cattle diets. High levels of either NPN source had …
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Technologies to Reduce Nutrient Excretion and Odor Production in Swine
… second study evaluated the same diets using N balance techniques. Reducing dietary CP did not affect (P > 0.05) growth performance, but decreased slurry pH (P < 0.09) from 6.71 to 6.21 +/- 0.186. Reducing CP decreased (P < 0.001) urinary N excretion by 56% and total N excretion by 41%. Overall, …
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Gastrointestinal acidity, protein and starch digestibility and amino acid absorption in ruminants fed a high-concentrate diet with limestone, magnesium oxide or defluorinated phosphate
… minerals on intestinal pH, rumen fermentation, N balance, dry matter and crude protein digestibility (DMD, CPD), and small intestinal disappearance of amino acids (AAD). Limestone (3%) increased (P < .03) rumen pH. Magnesium oxide increased (P < .10) ileal and fecal pH. Limestone significantly …
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Utilization of corn silage grown by conventional and sustainable methods fed with different nitrogen supplements
… supplemented with urea were in negative N balance (-1.04, and -.38, respectively). Sheep fed the conventional silage supplemented with SBM and sustainable silage supplemented with broiler litter had similar (P > .05) positive N retention. Conventional and sustainable silages were fed to …
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Digestibility, Nitrogen Balance, and Blood Metabolites in Llama and Alpaca Fed Barley and Barley Alfalfa Forages.
… forage quality on blood metabolites and nitrogen balance in mature, intact male llamas (n = 4, 36 ± 4.4 months, 87 ± 17 kg) at high altitude in Letanias, Bolivia (4,267 m = aprox.14,000 ft above sea level). A second experiment was conducted with eight adult gelded camelids (n = 8; 4 llamas, 24-36 …
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Effects of Small Intestinal Starch Digestion and Dietary Lipid on Efficiency of Nitrogen Use in Cattle
… N was increased by casein (P < 0.01). Nitrogen balance was not affected by greater duodenal Glu (P ≥ 0.34) despite increases in SISD, but casein increased N retention (P < 0.01). Duodenal casein (P = 0.38) and increasing amounts of duodenal Glu (P ≥ 0.15) had no effect on N retained as a …
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Nitrogen balance and nutrient requirements of young Nellore bulls fed with static or oscillating crude protein levels, and feeding behavior, water intake and requirements of bulls with different residual feed intakes
… supply on intake, digestibility, performance, N balance, and requirements of young Nellore bulls, and 2) to determine feeding behavior, water intake, and requirements of high and low residual feed intake (RFI) Nellore bulls. 42 young bulls (initial BW of 260 ± 8.1 kg; age of 7 ± 1.0 mo) were fed …
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Urea supplementation in rumen and post-rumen for cattle fed a low-quality tropical forage
… supplied as a ruminal pulse dose. The rumen N balance was negative for the control and when urea was totally supplied in the abomasum. The greatest microbial N production (P<0.10) was obtained when urea was partially or totally supplied in the abomasum. The highest efficiency of microbial …
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Turnover and fluxes of carbon and nitrogen in a spruce forest under natural and extreme meteorological conditions
… research in case of potentially changes in the N balance. Drying as well as freezing induced changes in the soil structure and properties and led to increased DOC concentrations. Moderate soil temperature had much less effects on C and N in this temperate forest soil. The results of this thesis …
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Efecto del aporte de ensilaje de sorgo a la dieta de vaquillonas que pastorean verdeo de trigo
… IVDMD, NDF digestibility, ADF digestibility and balance of nitrogen (N). The Experiment II lasted 101 days (from 11/06 to 19/09, 2007). 60 heifers of 8 months of age and 200 +24.7 kg BW were used, which were distributed in six treatments in a factorial arrangement of two alternatives for …
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Effects of fiber on the optimum threonine:lysine ratio for 25 to 50 kg growing gilts
… confirm the results of Exp. 4 by determining N balance in pigs fed either low-fiber or high-fiber diets that were deficient or adequate in Thr. Thirty-six growing gilts (initial BW: 29.0 ± 0.74 kg) were housed in metabolism cages and there were 9 replicates per diet. Output of N in feces was …
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Fermentation and energetic value of fiber in feed ingredients and diets fed to pigs
… observed for the ATTD of GE, DM, and OM, DE, N balance, and biological value of N among diets. However, more (P < 0.01) energy was excreted in the urine from pigs fed the xylose or arabinose diets compared with pigs fed the glucose diet, thereby reducing (P < 0.01) ME in these diets compared …
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Nutritional evaluation of raw meat and whole prey diets for domestic and exotic cats
… domestic cats maintained body weight (BW), N balance, and the majority of blood metabolites within reference ranges. In our first aim, we determined that traditional (beef trimmings; horse trimmings) and alternative (elk meat; bison trimmings) protein sources utilized in raw-meat based diets …
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