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dc.creatorCaldwell, Denise Yen_US
dc.descriptionDue to the character of the original source materials and the nature of batch digitization, quality control issues may be present in this document. Please report any quality issues you encounter to, referencing the URI of the item.en_US
dc.descriptionIncludes bibliographical references (leaves 50-53).en_US
dc.description.abstractSpray application offers low cost and efficient rographics. application of biologics and reduced concerns regarding diverse water quality and medicator/proportioner function. Presently, we evaluated the effect of selected photointensities, sound, and ambient temperature on preening behavior and ingestion of spray-applied biologics on day-of-hatch chicks. Temperature, sound, and especially photointensity, play a major role in determination of preening behavior in day-of-hatch chicks. Of these environmental factors, increasing photointensity (0 FC to 1 l 5.5 FC) at the time of spray-application was most useful for markedly and significantly increasing preening and preening-associated ingestion of spray-applied product. Furthermore, changing photointensity from 20 FC before spray application, to 300 FC briefly for 15 sec during spray application (15 sec) and holding chicks at 100 FC after spray application, increased cumulative preening events by more than 2-fold as compared to the normal hatchery practice of holding chicks at-20 FC prior to, and during spray application followed by moving chick trays immediately into stacks (-0.3 FC). Similar optimization of lighting intensity also resulted in more than 2-fold increases in cecal propionate concentrations 48 hrs after spray application, a known predictor of CE establishment and efficacy. Data from experiments with colorants suggested that darker colors markedly and significantly improved preening behavior under conditions of constant photointensity, but had lesser effects under more optimal photointensity regimes. Taken together, these data indicate that photointensity, and possibly other environmental spray-applied biologics. Furthermore, coloring of spray solutions preening activity under conditions of constant lighting. However, optimization of for application to neonatal chicks can improve photointensity near the time of spray application negates the need for addition of coloring and, in fact, increases preening activity to levels not observed due to color addition to the spray solution under conditions of constant lighting. These data indicate that environmental conditions at the time of spray-application are critical for optimal ingestion of spray-applied product by chicks and indicate that brief high intensity light exposure at the time of spray application, or subjecting the chicks to complete darkness prior to spray application, may improve CE ingestion and performance.en_US
dc.publisherTexas A&M Universityen_US
dc.rightsThis thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries in 2008. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use.en_US
dc.subjectveterinary microbiology.en_US
dc.subjectMajor veterinary microbiology.en_US
dc.titleOptimization of ingestion of spray-applied poultry biologics by modification of environmental conditions at the time of applicationen_US
dc.typeThesisen_US microbiologyen_US
dc.format.digitalOriginreformatted digitalen_US

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