Influence of dietary lanthanum oxide (La O ) on the blood characteristics and 2 3 ovarian morphometry of broiler chickens
The use of antibiotics as feed additives in animal production has been a source of health concern. A practical approach is the supplementation of animal feeds with rare earth element. Thus, this study was carried out with 225 day – old broiler chicks (CHI strain) to evaluate the influence of dietary Lanthanum oxide (La2O3 ) on the blood characteristics and ovarian morphometry. The feeding trial lasted eight weeks before the parameters were determined. The dietary treatments were designated as T1 , T2 , T 3, T4 and T5 . The T1 served as the negative control without La O while T was the positive control with antibiotic. La2O3 was supplemented to T3 , T4 , T3 , and T5 at 100, 200 and 300 ppm, respectively. The birds were divided into five groups of 45 each and randomly assigned to the five experimental diets using a completely randomized design (CRD). Each treatment was further divided into three replicates of fifteen (15) birds each and reared in a brooding unit and later on a deep litter house. Feed and water were provided ad-libitum. Results showed that the haematological parameters were not significantly (P>0.05) influenced by dietary treatments, except the differential leucocytes (eosinophils, lymphocytes and neutrophils); while in terms of the serum- biochemical indices, only cholesterol and bi-carbonate contents were significantly (P<0.05) influenced by dietary treatments. The ovarian weight was significantly (P<0.05) influenced by dietary treatments. The results of this study suggest that dietary La2O3 up to 300 ppm will not adversely affect the blood (haematological and serum biochemical) characteristics and ovarian morphometry of broiler chickens.
Keywords: Broiler chickens, blood, ovary, lanthanum oxide