[{"key":"dc.contributor.author","value":"Ming, Frederick Warren","language":null},{"key":"dc.date.accessioned","value":"2010-08-06T15:42:31Z","language":null},{"key":"dc.date.available","value":"2010-08-06T15:42:31Z","language":null},{"key":"dc.date.issued","value":"1985","language":null},{"key":"dc.identifier.uri","value":"http:\/\/hdl.handle.net\/2429\/27144","language":null},{"key":"dc.description.abstract","value":"Strain differences in efficiency of utilization of dietary protein and energy were investigated using rainbow trout (Salmo gairdneri) from Pennask and Premier Lakes (wild strains) and a trout farm (Sun Valley strain). Endogenous losses of protein and energy varied among the strains. Sun Valley fish were concluded to have a higher basal metabolic rate and maintenance requirement, based on slopes of regression (g or kcal loss \/ fish\/ day versus initial dry weight) for endogenous losses of protein and energy. \r\nEfficiency of protein and energy utilization were examined in two feeding trials conducted a year apart using a non-replicated factorial design comprising three strains (st), two feeding levels (fl), two dietary protein sources (pr) and two protein concentrations (co). Feed consumption (appetite) at ages 0 and 1 showed significant strain-related variation as did relative growth (R), and a number of efficiency traits: Feed Conversion Efficiency (FCE), Protein Efficiency Ratio (PER), Productive Protein Value (PPV), Net Protein Efficiency (NPE), Energy Conversion (EC), and Net Conversion of Energy (NCE).\r\nAge 0 strain ranking was consistently Sun Valley > Premier > Pennask for appetite, R and all efficiency traits except NCE . FCE and PER indicated a similar relationship among yearlings. Maintenance-corrected traits (NPE and NCE) in yearlings varied little among strains.\r\nStrain X diet interactions were significant (p<0.05) or near significant for several traits, indicating variable strain response to changes in levels of protein concentration or source. Statistically significant or near significant interactions for efficiency traits at age 0 were: st x fl (PPV, and NCE); st x pr (FCE, PER, PPV, and NCE); and st x co (FCE, NPE, and EC). Age 1 significant interactions were: st x fl (PPV), st x pr (NCE), st x co (FCE, PER and NPE). Significant or near significant st x pr and st x co interactions were observed for appetite (both years) and dry tissue growth (st x pr, age 0).\r\nAmmonia excretion, resulting from oxidation of amino acids, was evaluated for indirect comparison of strains for efficiency of protein utilization in a four-day assay at age 1. Ammonia-N excretion rate (mg NH\u2083\/ kg BW \/ g diet) following consumption of one high-protein meal daily correlated inversely in rank with FCE and PER, having values of 0.30, 0.31 and 0.44 for Sun Valley, Premier and Pennask, respectively.","language":"en"},{"key":"dc.language.iso","value":"eng","language":"en"},{"key":"dc.publisher","value":"University of British Columbia","language":"en"},{"key":"dc.rights","value":"For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https:\/\/open.library.ubc.ca\/terms_of_use.","language":null},{"key":"dc.title","value":"Variations of body composition, growth and efficiency of nutrient utilization among wild and domesticated strains of rainbow trout, Salmo gairdneri","language":"en"},{"key":"dc.type","value":"Text","language":"en"},{"key":"dc.degree.name","value":"Doctor of Philosophy - PhD","language":"en"},{"key":"dc.degree.discipline","value":"Animal Science","language":"en"},{"key":"dc.degree.grantor","value":"University of British Columbia","language":"en"},{"key":"dc.type.text","value":"Thesis\/Dissertation","language":"en"},{"key":"dc.description.affiliation","value":"Land and Food Systems, Faculty of","language":null},{"key":"dc.degree.campus","value":"UBCV","language":"en"},{"key":"dc.description.scholarlevel","value":"Graduate","language":"en"}]