Production of Layers in the Subtropical Zone.
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概要
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The study was conducted to survey the production of laying hens which have high genetical performance of productions, in the subtropical zone. It is considered that relatively high temperature and humidity throughout the year in the zone would depress the production of the hens. A large scale chicken farm in Okinawa Island has kept Shaver Star Cross 288. Their production records were analyzed and also management of the hens in the subtropical zone were discussed here.Production records were obtained from approximately 750, 000 laying hens of 48 flocks (approximately 15, 600 per flock) which were kept in 10 years during 1979 to 1988 in the farm.1) Mean production indicated that production of the hens in subtropical zone was not different from production of layers which were kept in a farm under superior management in the temperate zone.2) Hatching season of the layers did not influence their productions. Production during 3 months of summer was lower than that in the other seasons. No adverse effect, however, was observed in total production during 181 to 599 days of age.3) The hens in 8 flocks out of 11 which hatched in 1987 and 1988 recorded low egg production. It was suggested that low production of the hens of the flocks was due to genetical performance.4) There were no special facilities to protect high temperature and humidity. Polyethylene ducts in a house supplied fresh air and plywood boad in an attic protected sun heat. The hens fed a commercial formulated feed ad libitum.5) Analysis of production of the laying hens in the study indicates that the production of the hens having genetical high performance was not affected by climate of subtropical zone.
- 日本家禽学会の論文
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