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Effect of environmental temperature on healthy chicks and chicks inoculated with infectious bronchitis virus



Effect of environmental temperature on healthy chicks and chicks inoculated with infectious bronchitis virus



Poult. Sci, Agric. Engng. Dep., Univ. Connecticut, Storrs 06268, 46: 1098-1103



For each of 6 trials, 6 groups of 20 White Plymouth Rock male chicks were raised in 6 environmental cabinets. The trials were for the period from 4 to 8 weeks of age. Three of the 6 20-bird groups were inoculated with infectious bronchitis and then healthy and infected groups were subjected to environmental temperatures of 12.6C, 18.2C and 23.8C in a 6 x 6 Latin Square design. Conditions common to all of the cabinets were as follows: 1,115 sq cm/bird floor space; a relative humidity of 70[degree]/o; a ventilation rate of 472 cu cm/sec per bird; and lighting 24 hr. /day. A uniform ration was provided for all treatments during the 6 replications. The healthy chicks consumed 172 g more feed and gained 69 g more per bird than the infected chicks. These differences in feed consumption and weight gained were significant. However, there was no significant difference in feed efficiency due to state of health. The chicks housed at the 12.6C temperature consumed 222 grams more per bird than the chicks housed at 23.8C. While this difference in feed consumption was significant, there was no significant difference in weight gained as a result of the different temperatures. The chicks housed at the 23.8C temperature made . 408 kg of gain/kg feed and those housed at 12.6C made . 381 kg of gain/kg of feed. This . 027 difference was significant. Response of diseased and healthy chicks to the 3 temperatures was similar and there was no significant difference in performance due to temperature within the diseased or healthy chick samples. This indicates that infected and non-infected chicks perform in a similar manner throughout the range of environmental temperatures tested.

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Accession: 014435777

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DOI: 10.3382/ps.0461098


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