Effect of various water accessibility conditions on uric acid accumulation in renal tissue of commercial Bovans laying hens at mid production phase

Investigation of the effect of different water intake conditions on the performance, egg quality traits, and accumulation of uric acid in the kidney of commercial laying Bovans strain in mid production phase, an experiment was conducted in a completely randomized design. Experiments performed with 288 laying hens of Bovans hens including 4 treatments and 6 replications (12 hens per replication). All diets based on corn - soybean and metabolizable energy and protein levels were same . Experimental treatments include: 1) 3 nipples with regulated pressure with regulator, 2) 2 nipples with regulated pressure with regulator, 3) 3 nipples with pressure regulated with flash tank and 4) 2 nipples with pressure regulated with flash tank. Also, there was no significant difference between the treatment and the effect of the period in the parameters of feed consumption and feed conversion ratio and egg weight component and egg mass produced (P> 0.05). Regarding histological results, no significant effect was seen between experimental treatments on histological parameters including glomerular diameter, number of glomeruli, number of proximal tubes, number of distal tubes, number of tubes collecting ducts (P> 0.05). Also, parameters related to blood glucose and HDL- cholesterol levels as well as the amount of alanine aminotransferase were not affected by experimental treatments and were not significant (P> 0.05). Therefore, with respect to improving the quality of shell weight, a significant reduction in cholesterol, triglycerides, uric acid and heterophilic to lymphocyte ratio, the use of three nipples with regulated pressure is recommended.