Effects of Feeding Colloidal Silver and Rare Earth Elements on Growth Performance in Broilers
2010
Jo, J.K., Kangwon National University, Chuncheon, Republic of Korea | Kim, J.S., Kangwon National University, Chuncheon, Republic of Korea | Yun, K., Kangwon National University, Chuncheon, Republic of Korea | Kim, Y.W., Kangwon National University, Chuncheon, Republic of Korea | Kim, K.H., Kangwon National University, Chuncheon, Republic of Korea | Kwon, I.K., Kangwon National University, Chuncheon, Republic of Korea | Chae, B.J., Kangwon National University, Chuncheon, Republic of Korea
An experiment was conducted to investigate the effect of dietary supplementation of rare earth, individually and in combination with colloidal silver on growth performance, nutrient digestibility, carcass characteristics and immune response in broiler chicks. A total of 3,872 day-old chicks were randomly allotted to four dietary treatments in a randomized complete block design. There were four pens per treatment and 242 chicks per pen. The dietary treatments were T1) CON (control diet), T2) colloidal silver (control diet+20 ppb colloidal silver), T3) rare earth elements (control diet+500 ppm rare earth), T4) colloidal silver+rare earth elements (control diet+20 ppb colloidal silver+500 ppm rare earth). There were no significant differences in feed intake and feed conversion ratio (FCR) among dietary treatments during the whole experimental period (0 to 5 weeks). Body weight gain was greatest in birds fed T3 and T4 diets (p less than 0.01). Apparent digestibility of dry matter, crude protein, ether extract and calcium were greatest in birds fed T4 diet (p less than 0.05), while apparent digestibility of phosphorus was lowest in birds fed T3 diet (p less than 0.05). There was no significant difference in bone strength, carcass characteristics and immune response among dietary treatments. Dry matter content of bone was greatest in birds fed T4 diet (p less than 0.05), and phosphorus content of bone was greater in birds fed T3 diet than in birds fed T2 and T4 diets (p less than 0.05). Thus, the results of this study suggest that rare earth elements supplementation, individually and in combination with colloidal silver could improve performance of broilers.
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