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This study investigates, in red-legged partridge (Alectoris rufa), the effects of the time to change from incubationto hatching temperature on egg weight loss, hatchability, chick weight at hatch, incubation length, and developmentstage at embryonic mortality. Five batches of 80 eggs each were incubated at 37.8°C during the first 18, 19, 20, 21 or22 d of incubation, and subsequently at 37.5°C until hatching. Hatchability, development stage at embryonic mortalityand chick weight at hatch were not affected by the time of temperature change (p > 0.05). However, incubation lengthand egg weight loss after 21 d of incubation as representative of that of developed embryos were influenced by theincubation treatment (p < 0.001 and p < 0.05, respectively). Thus, eggs maintained at the incubation temperature of37.8°C for 22 d not only hatched earlier (23.04 d) but also with lower dispersion than eggs from the other treatments.As hatching may start around day 22 of incubation, to improve hatching synchrony we could recommend to move A.rufa eggs from the incubator, set at 37.8°C, to the hatcher on the 21st d of incubation keeping the temperature unchanged,and reduce it to 37.5°C on the 22nd d. Nevertheless, further research should be carried out to study the effect of thistemperature scheduling on chick growth and performance

spanish journal of agricultural research

Short communication. Effects of the time to change from incubation to hatching temperature on the artificial incubation of red-legged partridge (Alectoris rufa) eggs