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Optimization of ingestion of spray-applied poultry biologics by modification of environmental conditions at the time of application
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Spray 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.
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Includes bibliographical references (leaves 50-53).
Caldwell, Denise Y (1999). Optimization of ingestion of spray-applied poultry biologics by modification of environmental conditions at the time of application. Master's thesis, Texas A&M University. Available electronically from
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