STUDIES ON THE INFLUENCE OF ENVIRONMENTAL TEMPERATURES IN LAYING CHICKEN HALLS ON PRODUCTIVE PERFORMANCE

M.G. Usturoi

Abstract
   Research has focused on how the ambient temperatures ensured during the breeding of laying hens influence their productive performance.. To this end, two batches of birds of equal size (17280 Lohmann Brown hens / batch) were set up in two breeding halls, one of which had no additional thermal insulation (batch A) and a barn with an external heating system (batch B). At the end of the 51 weeks of operation, the birds in group B (thermally insulated hall) had a body weight 0.28% higher, an individual egg production better 1.46% and an average egg intensity higher 1.97% compared to hens accommodated in the hall without additional thermal insulation (batch A). Also in the chickens from batch B (thermally insulated hall) there were lower levels for the rate of exits from the herd (with 0.51%), the average daily consumption of compound feeds (by 0.73%) and the feed conversion index (with 2.23%). In conclusion, it can be stated that the application of additional construction elements on the walls of the halls used for growing laying hybrids (thermosystem) allows the achievement of adequate and constant ambient temperatures, which translates into an improvement in productive performance.