Inaugural ASAS–CAAV Asia Pacif ic Rim Conference Abstracts

86 Evaluation of phosphorus excretion model in sows. E.Kebreab*, A. Yitbarek, and C. M. Nyachoti, University of Manitoba, Winnipeg,MB, Canada.Successful nutrient management planning of sow operations depends on accurateestimation of nutrient output from the animal. The objective of the study wasto evaluate an empirical model that predicts P output and used to calculateland base requirements for manure spreading by an environmental agency.The model was originally developed for Quebec, Canada, and implementedin Manitoba, Canada. Eighteen sows were randomly allocated to receive adiet that meets the NRC requirement for P (6.0 g of total P/kg; NOPHY) orreduced P (5.1 g of P/kg) supplemented with microbial phytase at 500 FTU/kg (PHY). Samples of feed, feces, and urine were collected for 5 d after 7d of acclimatization. Urine was collected using urinary catheters. The resultswere a composite of 3 collection periods. Measured total P in manure (feces +urine) was compared to model predicted values. Evaluation was based on meansquare prediction error (MSPE), which was further decomposed into error ofprediction due to variation from regression line, central tendency, and random.The MSPE analysis showed that root MSPE as percentage of observed meanwas 10% in NOPHY and 30% in PHY treatments. This was further confirmedin the decomposition of sources of error with only 26 and 50% coming fromrandom variation in NOPHY and PHY diets, respectively. The annual land baserequirements for manure spreading based on the P content of manure from sowsfed NOPHY and PHY diets were 0.24 and 0.22 ha/sow, respectively. However,the model predicted 0.32 and 0.28 ha/sow, respectively. The overestimation bythe model, which was directly linked to P output predictions, has a significantimplication to producers in determining the amount of animals they are allowedto keep. Therefore, it is recommended that the model should be refined toreflect local conditions if it is to be used as a nutrient management planningand monitoring tool.Key Words: sow, modeling, phytase88 Effect of Mintrex Cu/Mn/Zn on performance and eggshellquality in laying hens. S. Qiujuan, W. Jinlei, Z. Tianguo, and G. Yuming*,College of Animal Science and Technology, China Agricultural University,Haidian, Beijing 100094.The study was carried out to investigate effects of Novus Mintrex Cu/Mn/Znon the performance of laying hens in different supplemental ways. A total ofone hundred eight 37-wk-old Hyline brown layers were randomly allotted to2 treatments with 6 replicates per treatment (3 pens per replicate and 3 layersper pen). The control is the basal diet supplemented with CuSO 4, ZnSO 4, andMnSO 4separately (Cu 10 ppm, Zn 30 ppm, and Mn 30 ppm). The secondtreatment was basal diet supplemented with Mintrex Cu 10 ppm, Zn and Mnfrom 2 sources of Mintrex Zn/Mn at 20 ppm and sulfite Zn/Mn at 10 ppm. Thediet was corn-soybean meal type and formulated based on NRC (1994). Thetrace minerals in the basal diet were Cu 6.5 ppm, Mn 17 ppm, and Zn 20 ppm,respectively, based on the actual analysis of the minerals in the feed ingredients.All diets were iso-energetic, iso-nitrogenous, and iso-methionine; part of theMet source was provided from Mintrex (Mintrex provided about 80% Metactivity). The experiment lasted for 10 wk from 39 to 48 wk of age. The resultsshowed that using Mintrex Cu/Mn/Zn to replace sulfite Zn/Mn at 20 ppm outof 30 ppm did not significantly influence laying performance and eggshellquality of the laying hens. Mintex Cu/Mn/Zn supplementation significantlyincreased Cu levels in tissues such as liver, spleen, pancreas, and egg yolk(P < 0.05), and also increased Mn levels in the serum, spleen, and egg yolk.The enzyme activity of hepatic Mn-SOD was enhanced by Mintrex Cu/Mn/Zn supplementation. It was indicated that Mintrex Cu/Mn/Zn supplementationdid not affect the blood lymphocyte proliferation exposed to ConA or LPS. TheBSA antibody production 10 d post primary or secondary injection of BSA wasnot influenced by Mintrex Cu/Mn/Zn.Key Words: Mintrex, layer, performance87 Influence of dietary phosphorus levels on growthperformance, body composition, and the serum biochemical indicatorsof juvenile Pelteobagrus fulvidraco. C. Wang* 1 , Q. Liao 2 , J. Zeng 1 , L. Xu 1 ,and Q. Sheng 1 , 1 The Fisheries College, Huazhong Agricultural University,Wuhan, Hubei, China, 2 Yueyang Zhanxiang Biological Science and TechnologyCorporation, Yueyang, Hunan, China.In order to reduce the phosphorus content in the effluent and adjust the phosphoruscontent in artificial feed for aquaculture, a growth trial was conducted to estimatethe effects of dietary phosphorous levels on growth performance, whole bodycomposition, and serum biochemical indicators of juvenile yellow-headedcatfish (Pelteobagrus fulvidraco). Three extruded diets (commercial yellowheadedcatfish diet-based) were formulated to contain Ca(H 2PO 4) 2levels at 25,15, and 5 kg per ton of diet (kg of Ca(H 2PO 4) 2/t), respectively. Each diet wasfed to triplicate groups of 15 fish (initial average BW of 3.2 g) over 4 wk. Atthe end of the trial, specific growth rate (SGR) and weight gain (WG) of thefish fed with the diet containing 15 kg of Ca(H 2PO 4) 2/t was significantly higherthan the other groups (P < 0.05). Body crude protein content of the fish fed withthe diet containing 25 kg of Ca(H 2PO 4) 2/t had significantly increased comparedwith those fed the diet containing 5 kg of Ca(H 2PO 4) 2/t (P < 0.05), whereasboth of them did not have significant difference between 15 kg of Ca(H 2PO 4) 2/ttreatment groups (P > 0.05). Serum superoxide dismutase (T-SOD) of the fishfed with the diet containing 15 kg of Ca(H 2PO 4) 2/t was significantly higher thanthe other 2 dietary treatments (P < 0.05). There was no significant differencein alkaline phosphatase (AKP), calcium, and phosphorus in serum among 3dietary treatments (P > 0.05). The results suggested that phosphorus contentin the current commercial feed for juvenile yellow headed catfish could bereduced from 25 to 15 kg of Ca(H 2PO 4) 2/t, and the growth performance, bodycomposition, and immunity of this fish would not be diminished.Key Words: Pelteobagrus fulvidraco, dietary phosphorus, growth89 Effects of Mintrex Mn on growth performance in broilers.W. Jinlei, Z. Tianguo, S. Qiujuan, and G. Yuming*, College of Animal Science& Technology, China Agricultural University, Beijing, 100094 China.The objective of the current study was conducted to assess efficacy of NovusMintrex Mn on growth performance of broilers in different supplemental ways.This study was designed to investigate the impact of Mintrex Mn on broilerperformance. The experiment lasted for 42 d. A total of 168 one-day-old maleAA broiler chicks were allotted to 3 treatments in a completely randomizeddesign with 8 replicates per treatment and 7 birds per replicate pen. Thecontrol is an inorganic mineral (sulfate) supplemented group (Cu 10 ppm, Zn50 ppm, and Mn 60 ppm separately); group 2 was basal diet supplementedwith sulfate Mn 40 ppm and Mintrex Mn 20 ppm; and group 3 was added ontop with Mn 20 ppm from Mintrex Mn. The diet was corn-soybean meal typeand formulated based on the Nutrient Requirement Recommendation by NRC(1994). The basal concentrations of trace mineral elements were Cu 8 ppm, Mn17.5 ppm, and Zn 22.5 ppm, respectively, based on the actual analysis of theminerals in the feed ingredients. All diets were iso-energetic, iso-nitrogenous,and iso-methionine; part of the Met source was provided from Mintrex forMintrex treatments (Mintrex provided about 80% Met activity). The resultsshowed that Mintrex Mn at 20 ppm to replace sulfate Mn or on top of sulfatedid not influence FCR of the chickens. Supplemental Mintrex Mn at 20 mg/kg increased FI and BW of the chickens. The Mn levels in the sera, pancreas,liver, and phalanx were higher in the groups supplemented with Mintrex Mn.No difference was observed in the tibia Mn level between different treatmentgroups. The enzyme activity of hepatic Mn-SOD was enhanced by MintrexMn supplementation. The Mn levels in tissues such as serum, pancreas, andliver were higher than that of the control group. The Mintrex Mn supplementedgroup did not influence the blood lymphocyte proliferation exposed to ConAor LPS. The BSA antibody production 10 d post primary injection of BSA wassignificantly increased in the chickens fed with Mintrex Mn (P < 0.01).Key Words: Mintrex Mn, broiler, growth27