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dc.contributor.advisorMcKinnon, John J.en_US
dc.contributor.advisorMcAllister, Timothyen_US
dc.creatorBevans, Darren Wayneen_US
dc.date.accessioned2005-03-10T19:00:50Zen_US
dc.date.accessioned2013-01-04T04:26:26Z
dc.date.available2005-04-13T08:00:00Zen_US
dc.date.available2013-01-04T04:26:26Z
dc.date.created2005-01en_US
dc.date.issued2005-01-19en_US
dc.date.submittedJanuary 2005en_US
dc.identifier.urihttp://hdl.handle.net/10388/etd-03102005-190050en_US
dc.description.abstractTwo trials were conducted to evaluate effects of grain adaptation protocol on subacute acidosis, feeding behaviour and ADG of cattle. In trial one, 12 crossbred heifers (384 ¡À 25 kg) were stepped from 40% to 90% dietary concentrate by either rapid adaptation (RA; one step-up diet fed for 3 d) or by gradual adaptation (GA; five step-up diets fed for 3 d each). Mean daily ruminal pH variables did not differ (P > 0.10) between treatments but variances of a number of ruminal pH variables were greater (P < 0.05) for RA than GA during adaptation to 65% and 90% concentrate. Mean hourly pH did not differ over the first 24 h of adaptation to 65% concentrate, but variance of hourly pH tended (P < 0.10) to be greater for RA than GA for eight of the first 24 h of adaptation to 90% concentrate. Increased variance in ruminal pH parameters was associated with detection of acidosis in certain individuals. On d 1 of 90% concentrate, ruminal pH tended (P = 0.07) to be lower at 11 and 12 h post-feeding with RA than with GA. Ruminal volatile fatty acids (VFA) and osmolality were similar between treatments. In trial two, 120 crossbred heifers (366 ¡À 23 kg) were adapted from 40% to 90% concentrate. A protocol identical to trial one was used with the addition of moderate adaptation (MA; three step-up diets fed for 3 d each). The increase to 65% concentrate caused reduced daily bunk attendance and increased maximum intermeal interval for RA compared to MA and GA cattle but the increase to 90% did not. ADG was reduced for RA compared to MA or GA during adaptation but over day 1 to 69 ADG did not differ between treatments (P ¡Ý 0.41). Current management strategies for preventing acidosis in pens of cattle are based on responses of the most susceptible individuals. Improved understanding of individual responses to acidotic challenge may allow development of more effective acidosis prevention practices.en_US
dc.language.isoen_USen_US
dc.subjectConcentrateen_US
dc.subjectFeeding Behaviouren_US
dc.subjectGrain Adaptationen_US
dc.subjectGrowth Performanceen_US
dc.subjectRuminal pHen_US
dc.subjectAcidosisen_US
dc.titleEffect of The number of step-up diets fed during grain adaptation on acidosis and feeding behaviour of feedlot cattleen_US
thesis.degree.departmentAnimal and Poultry Scienceen_US
thesis.degree.disciplineAnimal and Poultry Scienceen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberVan Kessel, Andrew G.en_US
dc.contributor.committeeMemberBuchanan, Fiona C.en_US


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