Study On The Effects Of Different Selenium Sources On Production Performance Of Broilers

In order to study the effects of different selenium sources on broiler growth performance, slaughter performance, meat quality, nutrient metabolism, gut microbes and serum biochemical indexes, four experiments were included in this study.Experiment 1:Ninety-six thousands AA broilers aged of one day were randomly assigned to two groups,3 duplicates in each group,16000 broilers in each duplicate. Two groups received the same basal diet. The control group was added with 0.3 mg/ kg of inorganic selenium (Na2SeO3); and the treatment group was added with 0.3 mg/kg of organic selenium (Sel-Plex) in the diets. Experimental period was 42 days. The feeding results showed that daily weight gain and feed intake in treatment group were increased by 8.92%(P<0.05) and 3.99%(P<0.05), respectively, compared with the control. The survival rate and feed gain ratio were decreased by 0.93%(P< 0.05) and 4.84% (P<0.05), respectively, compared with the control. The results indicated that the effects of organic selenium on broiler growth performance were superior to that of inorganic selenium.Experiment 2:Eight AA broilers aged six weeks (4 males and 4 females) were selected from every group to study the effects of different selenium sources on slaughter performance and meat quality in broilers. The results showed that different selenium sources did not affect slaughter performance of the broilers. Compared with inorganic Se, organic Se significantly increased the meat red color degree, and decreased drip loss. The meat red color degree of chest muscle and thigh muscle were increased by 13.98% (P<0.05) and 20.83% (P<0.05), respectively. The drip loss of chest muscle and thigh muscle were decreased by 13.57%(P<0.05) and 24.92%(P< 0.05), respectively. Different selenium sources did not affect pH and tenderness of meat. The results indicated that the effects of organic selenium on decreasing myoglobin oxidation, stabilization of meat color and decreasing drip loss were superior to that of inorganic selenium.Experiment 3:Six AA broilers aged six weeks (3 males and 3 females) were selected from each group to study the effects of different selenium sources on nutrient metabolism and gut microbes. The results showed that different selenium sources did not significantly affect nutrient metabolism of the broilers. Compared with control group, the total bacteria and E.coli in small intestine in treatment group were increased by 31.13%(P<0.05) and 97.74%(P<0.05), respectively. The total bacteria and E.coli in cecum and rectum in treatment group were a little higher than that in control group (P>0.05). Lactobacillus in small intestine, cecum and rectum in treatment group were a little lower than that in control group (P>0.05). The results indicated that the effects of inorganic selenium on promoting beneficial bacteria and inhibiting E.coli growth superior to that of organic selenium.Experiment 4:Six broilers aged six weeks (3 males and 3 females) were selected from each group to study the effects of different selenium sources on serum biochemical indexes. The results showed that the different selenium sources could affect some serum biochemical indexes. Compared with control, the GSH-Px and SOD activity in treatment group were increased by 155.83%(P<0.05) 5.38%(P >0.05). The results indicated that the effects of organic selenium on enhancing body oxidation resistance were superior to that of inorganic selenium.In conclusion, the organic selenium in broiler diets could significantly increase growth performance, improve meat quality and enhance body oxidation resistance. Different selenium sources did not affect nutrient metabolism and most serum biochemical indexes. The effects of inorganic selenium on promoting beneficial bacterial growth and inhibiting E.coli were superior to that of organic selenium.