Inaugural ASAS–CAAV Asia Pacif ic Rim Conference Abstracts

78 Effect of the level of vitamin A on growth and biochemicalindexes of growing layer ducks. Y. D. Zhang*, J. L. Wu, and A. Wang, Instituteof Animal Nutrition, Northeast Agricultural University, Harbin, China.This study was designed to evaluate the effect of vitamin A on the biochemicalindexes of serum and organization in growing layer ducks. Two hundred sixtyJin-Ding ducks, with an average weight of (0.37 ± 0.01) kg, were chosenand randomly divided into 6 treatments, which were fed a basal diet withsupplements of 0, 2,250, 5,500, 8,250, 12,000, or 15,000 IU/kg of vitaminA, respectively. The trial lasted 7 wk. The results showed that GSH-Px andSOD activities of serum and liver were increased (P < 0.05) with increasingvitamin A levels. The T-AOC of serum and liver were increased significantly (P< 0.05), and serum and liver MDA concentration were decreased significantly(P < 0.05) when adding 5,500 and 8,250 IU/kg of vitamin A. When adding12,000 and 15,000 IU/kg of vitamin A, T-AOC of serum and liver and GSH-Px and SOD activities of serum and liver decreased compared with adding5,500 and 8,250 IU/kg of vitamin A. It is concluded that duck will evidentlyincrease antioxidant ability and decrease lipid peroxidation when adding 5,500and 8,250 IU/kg of vitamin A. Supplementing with 8,250 IU/kg of vitamin Asignificantly affects spleen (P < 0.05), ALB (P < 0.05), and GLB (P < 0.01).The content of ALB, GLB, and A/G were not significantly different (P > 0.05)when adding 5,500, 8,250, 12,000, or 15,000 IU/kg of vitamin A. The contentof IgG, IgM, and IL-2 first increased then decreased as the level of vitaminA increased (P > 0.05). Vitamin A had no significant effect on the content ofT3, T4 (P > 0.05), but significantly affected the content of GH (P > 0.05).It is concluded that the immune function of growing ducks will be improvedand thyrine, chondrotropic hormone will be regulated when adding 5,500 or8,250 IU/kg of vitamin A. It is suggested that the optimal supplement amountof vitamin A was from 5,500 to 8,250 IU/kg under the cage environment.Note: this research is supported by National Natural Science Foundation ofChina (NSFC, No. 30571345).Key Words: vitamin A, growing layer duck, biochemical index79 Effect of the level of vitamin E on growth and organismbiochemical indexes of growing ducks in cages. J. L. Wu*, Y. D. Zhang,and A. Wang, Institute of Animal Nutrition, Northeast Agricultural University,Harbin, China.Nonruminant Nutrition III80 Effects of dietary vitamin level on the productive performanceof laying hens. H. Zang* 1 , K. Zhang 1 , X. Ding 1 , J. M. Hernández 2 , and D. Yao 3 ,1Institute of Animal Nutrition, Key Laboratory for Animal Disease-ResistanceNutrition of China Ministry of Education, Sichuan Agricultural University,Yaan, Sichuan 625014, P. R. China, 2 DSM Nutritional Products Ltd., R&DAnimal Nutrition and Health, Wurmisweg 576, CH-4303 Kaiseraugst,Switzerland, 3 DSM (China) Limited, No. 476, LiBing Road, Zhangjiang High-Tech Park, PuDong Area, ShangHai 201203.The trial was conducted to study the effects of dietary vitamin level changeon the laying performance of commercial laying hens after 39 wk of feedingwith different vitamin levels. During 1 to 39 wk, a single factorial design wasused with 4 vitamin levels: treatment 1 was the current average industry levelin China (local); treatment 2 was optimum vitamin nutrition level (OVN);treatment 3 was NRC (1994) with Hy.D (25-hydroxy-cholecalciferol); andtreatment 4 was NRC. A total of 1,800 Lohmann Pink-shell commercial layersat 25 wk of age were assigned randomly into 4 treatments with 10 replicatesper treatment and 45 layers per replicate. The hens were fed in commerciallaying cages with 3 birds per cage and free access to feed and water for 39 wk.Then from 40 to 45 wk, the dietary vitamin level was changed with the localtreatment changed to OVN, NRC with Hy.D changed to NRC, and the other 2treatments unchanged. Hen-day laying rate (HDLR), feed intake (ADFI), eggweight (EW), feed conversion rate (FCR), and hen mortality rate (HMR) weredetermined on the basis of weekly replicates. The HDLR for treatments 1, 2,3, and 4 at 39 wk were 70.99, 88.02, 86.32, and 85.27%, respectively, withsignificant difference from treatment 1 to the other 3 treatments (P < 0.05), and86.48, 83.95, 81.67, and 81.57% at 45 wk, respectively, and that for treatment 1was significantly higher than treatment 4 (P < 0.05). The ADFI for treatments 1,2, 3, and 4 at 39 and 45 wk were 105.8 vs. 120.9 g, 120.3 vs. 118.2 g, 118.5 vs.115.3 g, and 120.1 vs. 115.3 g, respectively. After 1 wk later with the change ofvitamin level, the HDLR, ADFI, EW, and FCR for treatment 1 were improvedand then continued to be improved to the level of OVN, with no significantinfluence on HMR. After the NRC with Hy.D was changed to NRC, the HDLRfor treatment 3 was trending to decrease to the level of treatment 4 with NRClevel, with no significant influence on ADFI, EW, FCR, and HMR. The resultsfurther showed that OVN was the best at supporting egg laying.Key Words: vitamin, laying hen, performanceThe objectives of this study were to investigate the effects of different levels ofvitamin E on biochemical indexes of serum and organization in growing layerducks. Four-week-old Jin-Ding growing ducks (n = 216) with similar weight(0.45 ± 0.01) kg were randomly allotted into 6 treatments with 6 replicationsand 6 ducks each in a completely randomized design. The six treatments weresupplemented with 0, 10, 20, 40, or 100 IU/kg, respectively, relative to thebasal diet. The entire trial period was 7 wk. The results showed that vitamin Aincreased T-AOC and GSH-Px activity in serum and liver (P > 0.05), additionof 15, 20 IU/kg of vitamin E in diet significantly increased SOD activity inserum compared with other groups. However, MDA in serum had a decreasingtendency (P > 0.05), but content of MDA in liver decreased significantly (P 0.05). Immune organ indexes (thymus, bursa, and spleen)had a different degree increase compared with 0 IU/kg of vitamin E group;significant effects on immune organ index (thymus and bursa) were observedin growing ducks fed 15 or 20 IU/kg of supplemental vitamin E (P < 0.05). Theconcentration of Cort had the opposite tendency relative to the vitamin E levels.Concentrations of serum T3 and T4 were higher than no supplemented vitamin E(P > 0.05). It is suggested that the optimal supplement amount of vitamin E wasfrom 15 to 20 IU/kg under cage conditions at the stage of young laying ducks.Note: this research is supported by National Natural Science Foundation ofChina (NSFC, No. 30571345).Key Words: vitamin E, young cage-rearing laying ducks, organism biochemicalindexes81 Zinc requirement of yellow broilers from one to twenty-onedays of age. Zongyong Jiang*, Xiaoyan Liu, Guilian Zhou, Shouqun Jiang,and Xianyong Ma, The Key Laboratory of Animal Nutrition and Feed Science(South China) of Ministry of Agriculture, Guangdong Public Laboratoryof Animal Breeding and Nutrition, Institute of Animal Science, GuangdongAcademy of Agricultural Sciences, Guangzhou, Guangdong, P.R. China.This experiment was conducted to investigate dietary zinc level on growthperformance, antioxidant capacity, immune function, and zinc deposition inyellow broilers of 1 to 21 d of age and to estimate the optimal dietary zinc levelfor yellow broilers fed a cornstarch-corn-soybean meal diet. A total of 1,440one-day-old male broilers were randomly assigned to 6 dietary treatments with 6replicates of 40 birds. The treatments received the same basal diet supplementedwith 0, 20, 40, 60, 80, and 120 mg/kg of zinc from zinc sulfate (ZnSO 4.H 2O),respectively. The feeding trial lasted for 21 d. The results showed that 1) addingzinc significantly improved the growth of broilers from 1 to 21 d of age (P 0.05). Based on criteria includingADG, AKP activity in serum, and zinc concentration in tibia, the estimatedrequirements of zinc all were 85 mg/kg, but the optimal zinc level estimated byNLIN were 99, 96, and 93 mg/kg, respectively.Key Words: zinc deposition, zinc requirement, yellow broiler25