introduction of a greenhouse as an alternative housing system to a conventional house and its impact on broiler performance and blood and carcass variables

a study was conducted to compare the growth performance as well as blood and carcass variables of two broiler strains reared in a conventional broiler house and a modified greenhouse equipped with cooling pads and tunnel ventilation system. eight hundred day-old chickens of two commercial strains (ross  308 and lohmann) were selected and placed in  8 floor pens (4 pens of  50 broilers for each strain in each housing system). the pens were located randomly throughout the modified greenhouse or the conventional broiler house (two-way anova design). the broilers were provided a standard starter and grower diets  ad libitum. the environmental conditions (i.e.  temperature, relative humidity, lighting program and ventilation rate) were kept  similar between the two houses. the results showed that the birds in the greenhouse consumed significantly (p