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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 16 of 16 for “"nutrient balance"”.
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Impact of Precision Feeding Strategies on Whole Farm Nutrient Balance and Feeding Management
… management software was assessed for whole farm nutrient balance (WFNB) and feeding management from January through December 2006. Nine treatment and six control farms were selected in four regions of the Chesapeake Bay Watershed of Virginia. Herd sizes averaged 271 and 390 lactating cows for …
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The Impact of Feed Management Software on Whole-Farm Nutrient Balance on Virginia Dairy Farms
… impact of feed management software on whole-farm nutrient balance was studied on 18 dairy farms located in Virginia from 2006 to 2010. Nine farms began using the TMR Tracker feed management software in 2006 and were compared to 9 control farms not using feed management software. Each of the …
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Immunometabolism of methyl donors by dairy cattle during periods of negative nutrient balance and heat stress
… heat stress (HS) are characterized by a negative nutrient balance (NNB), decreased milk production and altered immunometabolism. The first experiment examined the effects of post-ruminal choline supply during NNB on production and pathways of one-carbon metabolism. Ten primiparous rumen-cannulated …
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Effect of land application of fluidized-bed combustion residue on soil and plant characteristics of reclaimed surface-mined pastures, performance and mineral status of grazing steers and nutrient balance by sheep fed the forage
… Hay harvested from one rep was used in a mineral balance trial with 18 wethers. Apparent digestibility of dry matter, crude protein and fiber components, and N retention were not affected by treatment. Control animals were in negative Ca balance. Apparent absorption of Mg was higher (P < .01) for …
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Applying the diagnosis and recommendation integrated system(DRIS) to Fraser fir Christmas trees
The process of diagnosing the foliar nutrient status of Fraser fir [Abies fraseri (Pursh)Poir.] Christmas trees and prescribing fertilizers is not well understood. Agricultural researchers have established critical yield levels for agronomic crops that are objective measures of crop quality and …
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Nutrition and amino acid composition of a rumen bacterium
… test an hypothesis that the optimum nitrogenous nutrient balance for a strongly heterotrophic organism is that mixture of the basic structural molecules ( amino acids, purines, and pyrimidines ) which most closely approximates the composition of the organism itself. 2. To apply this hypothesis …
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Tropical stony corals host diverse microbial nitrogen dynamics
… coral holobiont. This holobiont maintains the nutrient balance of their symbiosis amid reefs' otherwise oligotrophic environment, including by cycling physiologically important nitrogen compounds. Nitrogen (N) fixation has been well quantified in corals in accounting for the source of their …
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Water and Nutrient Reuse within Closed Hydroponic Systems
… research exists on the maintenance of individual nutrient balance within the nutrient solutions of closed hydroponic systems and how this maintenance may result in reductions in water and nutrient consumption. In this study, a nutrient solution management procedure was developed to maintain …
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A Study of the Ecological Factors Influencing the Efficiency of the Activated Sludge System for Treating Organic Wastes
… turbidity, indicating the influence of nutrient balance. The comparison of aeration tank layouts under closely controlled conditions showed that the sludge settlement characteristics from interseries and four-pocket series flow systems were significantly better than those from …
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Tropical stony corals host diverse microbial nitrogen dynamics
… coral holobiont. This holobiont maintains the nutrient balance of their symbiosis amid reefs’ otherwise oligotrophic environment, including by cycling physiologically important nitrogen compounds. Nitrogen (N) fixation has been well quantified in corals in accounting for the source of their …
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Reinforcement Learning and Economic Decision-making for Nutrient Rewards in Rhesus Monkeys
… nutritional homeostasis. Here, I propose nutrients as biological sources of food values that link sensory food properties to nutrient decision-making. To investigate how economic values for food rewards derive from their nutrients and sensory qualities, I first demonstrated that monkeys …
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Phosphorus Losses from Simulated Dairy Mangement Intensive Grazing Forage System
… as an environmentally safer way of managing nutrient balance on Center. However, little research has been conducted to evaluate how these systems affect phosphorus (P) loss from the Center through runoff and forage removal. The goal of this study was to investigate the effects of forage type …
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Nutritional and Management Practices to Reduce Excessive Nutrient Excretion on Dairy Farms
A 2-yr field study was conducted to reduce nutrient losses from Virginia dairy farms through nutritional and herd management practices. Ten collaborator herds were identified, all at state DHIA average or better for milk yield and days open. Baseline feed samples and ration information were …
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ENHANCING BIOGAS PRODUCTION IN COLD-REGION WASTEWATER TREATMENT USING ULTRASONIC PRETREATMENT AND CO-DIGESTION WITH BREWER’S SPENT GRAIN
… Combining TWAS and BSG, AcoD can help optimize nutrient balance, stabilize digestion, and increase methane (CH4) production. This study systematically optimized the US pretreatment conditions (amplitude and disintegration time) and the TWAS/BSG mixing ratios utilizing the Central Composite …
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Der Einfluß des primären Stickstoffstoffwechsels auf den Aminosäure- und Sekundärstoffwechsel in Nicotiana tabacum L.
… führte zu der, nach der „Carbon-Nutrient-Balance“ Hypothese erwarteten Verlagerung der kohlenstoffreichen Phenylpropanoide und des stickstoffreichen Nikotins. Die Erhöhung der Phenylpropanoidgehalte war nicht in der Nitrat akkumulierenden NIA-Transformante zu beobachten und somit …
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Effects of Calcium and Enzyme Supplementation on the Occurrence of Necrotic Enteritis
Diet composition and nutrient balance can have a critical impact on intestinal integrity during exposure to enteric pathogens. Researchers have extensively reported benefits on nutrient availability and broiler performance as a consequence of the impact of phytase supplementation. However, the …