Effect of an Evaporative Cooling and Dust Control System on Rearing Environment and Performance of Male Broiler Chickens ,

Willis, Willie L.; Ouart, M. D.; Quarles, C. L.

doi:10.3382/ps.0661590

Cited by 15 publications

(8 citation statements)

References 7 publications

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“…Ammonia build-up (produced by bacterial metabolism of poultry nitrogenous waste) adversely affects BW, feed conversion, and livability in poultry (Reece et al, 1980). Alternatively, increased dustiness, resulting from bedding materials that are too dry, makes the poultry more susceptible to respiratory diseases (Willis et al, 1987). However, provided that bedding materials are free from fungi and dust, are not derived from toxic plant species, and have not been treated with heavy metals and pesticides, they should not be harmful to poultry.…”

Section: Introductionmentioning

confidence: 98%

Influence of different litter materials on cecal microbiota colonization in broiler chickens

et al. 2009

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A chicken growth study was conducted to determine if litter type influenced gut microbiota and performance in broilers. Seven bedding materials were investigated and included soft and hardwood sawdust, softwood shavings, shredded paper, chopped straw, rice hulls, and reused softwood shavings. Microbial profiling was done to investigate changes in cecal bacterial communities associated with litter material and age. Cecal microbiota were investigated at 14 and 28 d of age (n = 12 birds/litter material). At both ages, the cecal microbiota of chickens raised on reused litter was significantly (P < 0.05) different from that of chickens raised on any of the other litter materials, except softwood shavings at d 28. Cecal microbiota was also significantly different between birds raised on shredded paper and rice hulls at both ages. Age had a significant influence on cecal microbiota composition regardless of litter material. Similarity in cecal microbial communities among birds raised on the same litter treatment was greater at 28 d of age (29 to 40%) than at 14 d of age (25 to 32%). Bird performance on the different litter materials was measured by feed conversion ratio, live weight, and feed intake. Significant (P < 0.05) differences were detected in live weight at 14 d of age and feed intake at 14 and 28 d of age among birds (n = 160/treatment) raised on some of the different litter materials. However, no significant (P > 0.05) differences were observed in feed conversion ratio among birds raised on any of the 7 different litter materials at either 14 or 28 d of age. The type of litter material can influence colonization and development of cecal microbiota in chickens. Litter-induced changes in the gut microbiota may be partially responsible for some of the significant differences observed in early rates of growth; therefore, litter choice may have an important role in poultry gut health particularly in the absence of in-feed antibiotics.

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Section: Introductionmentioning

confidence: 98%

Influence of different litter materials on cecal microbiota colonization in broiler chickens

et al. 2009

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“…Birds Effect of ammonia and dust on broilers: A. A1 Homidun et ul. reared in cooler, less dusty chambers were 45 g and 165 g heavier at 4 and 7 weeks of age, compared with those reared in chambers lacking these environmental modifications (Willis et al, 1987). Thus, although there is a limited amount of information, birds grow faster in less dusty environments and are likely to maintain better health.…”

Section: The Effect Of Dust On Broiler Performancementioning

confidence: 90%

Review of the effect of ammonia and dust concentrations on broiler performance

Homidan

Robertson

Petchey³

2003

World's Poultry Science Journal

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“…Several evaporative systems have been explored to cool poultry at high temperatures. Research has shown that evaporative cooling is effective in relieving heat stress of birds (Watson, 1981;Wilson, et al, 1983;Timmons and Baughman, 1984;Timmons and Gates, 1988;Willis et al, 1987;Gates et al, 1989Gates et al, , 1992Berry et al, 1990;Bottcher et al, 1991Bottcher et al, , 1992Czarick and Lacy, 1991;Lacy and Czarick, 1992;Simmons and Deaton, 1989;Lott, 1996, 1997;Chepete and Xin, 2000;Donald, 2000;Yanagi at al., 2002a). Even in areas of high relative humidity (RH), the beneficial effect of lowering air temperature can exceed the detrimental effect of increased RH (Reece and Deaton, 1971).…”

Section: Introductionmentioning

confidence: 99%

Optimization of Surface Wetting to Cool Broiler Chickens

Tao

Xin

2003

2003, Las Vegas, NV July 27-30, 2003

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Surface wetting to cool broiler chickens (46±3 d, 2.8± 0.1 kg) was investigated under 18 acute thermal conditions formed by three dry-bulb temperatures (tdb, 35, 38, and 41 oC) × two dew-point temperatures (tdp,19.4 and 26.1oC) × three air velocity (V, 0.2, 0.7 and 1.2 m •s-1). The synergistic effects of tdb and tdp were expressed in terms of vapor pressure deficit of the air (VPDair). Surface temperature of the cooled birds was 1.9-2.5 oC lower than that of their control counterparts. Core body temperature (tb) rise of the cooled birds was 1.2, 1.6, and 1.7 oC lower than that of the control birds at 35, 38, and 41 oC, respectively. Increasing V narrowed the difference in tb between the cooled and the control broilers, 2.0, 1.4, and 1.2 oC for V of 0.2, 0.7, and 1.2 m •s-1, respectively. Increasing tdp from 19.4 to 26.1 oC produced only 0.2 oC overall difference in tb. Results of this study demonstrate that surface wetting coupled with good air movement, as in the case of tunnel ventilation, is effective in relieving heat stress of the birds even under relatively humid conditions. The cooling water needs, expressed as spray interval at a nominal spray dosage of 22 ml •bird-1 (SI22, min) and evaporation rate (ER, ml/min •kg0.67), were optimized by relating the SI22 or ER to the thermal conditions, of the form, SI22 = 70.50-27.14. V-4.84 .VPDair, and ER =-0.0471 + 0.1700. V + 0.0297 .VPDair.

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Effect of an Evaporative Cooling and Dust Control System on Rearing Environment and Performance of Male Broiler Chickens ,

Cited by 15 publications

References 7 publications

Influence of different litter materials on cecal microbiota colonization in broiler chickens

Influence of different litter materials on cecal microbiota colonization in broiler chickens

Review of the effect of ammonia and dust concentrations on broiler performance

Optimization of Surface Wetting to Cool Broiler Chickens

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