The Influence of Fast and Slow Rises in Ambient Temperature on Production Traits and Mortality of Laying Pullets ,
1960; Elsevier BV; Volume: 39; Issue: 1 Linguagem: Inglês
10.3382/ps.0390119
ISSN1525-3171
AutoresAntônio Cícero Pires de Campos, F.H. Wilcox, C.S. Shaffner,
Tópico(s)Insect and Pesticide Research
ResumoTHERE are numerous reports in the literature that deal with the influence of high ambient temperature on the well-being and performance of laying hens. High summer temperatures are known to cause a decrease in egg production. The drop is more severe during sudden than under gradual rises in air temperature, according to Willham (1931), Hutt (1949), and Hinds (1949). Results obtained by Lee et al. (1945) with Leghorns and Australorps showed that most hens were able to withstand a 7-hour exposure to air temperatures of 105°F., but none were able to withstand 110°F. Wilson (1948) found it impossible to keep Leghorn hens alive for more than six hours under an air temperature of 105°F. Heat waves with intensities ranging from 100° to 105°F. have been reported by Hutt (1938), Wilson (1949), and Fox (1951) to cause heavy losses of laying flocks in the middle Atlantic and New England states. On…
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