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猪营养体系.ppt

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猪营养体系猪营养体系 Swine Nutrition System正大集团饲料技术线正大集团饲料技术线 Feed Technology Function Line China Area营营养养学学真真意意The Reality of Nutrition 产产出出=(遗遗传传+环环境境+营营养养)*管管理理P=(G+E+N)*M猪营养体系猪营养体系Swine Nutrition Systems母猪营养体系母猪营养体系 Sow Nutrition System 乳猪营养体系乳猪营养体系 Baby Pig Nutrition System 育肥猪营养体系育肥猪营养体系 Grow/finish Nutrition System母猪营养体系母猪营养体系 Sow Nutrition System揭示现代母猪妊娠和泌乳的营养需要量揭示现代母猪妊娠和泌乳的营养需要量Understand the nutritional needs of modern sows during gestation and lactation了解不同胎次营养需求的差异了解不同胎次营养需求的差异Understand potential parity differences评价后续的繁殖性能评价后续的繁殖性能Must evaluate subsequent reproductive performance产仔更多（产仔更多（12.5头活仔）头活仔）Larger litter size(12.5 born alive)高产奶量和仔猪窝增重（高产奶量和仔猪窝增重（2.5-3.5 kg/d）Higher milk yield and greater litter growth rate(2.5 3.5 kg/d)成年体型更大成年体型更大Greater mature body size体组成改变（脂肪少、瘦肉多）体组成改变（脂肪少、瘦肉多）Change in body composition-less fat,more lean 食欲降低食欲降低 Reduced appetite现代种母畜与现代种母畜与20-30年前相比差别很大：年前相比差别很大：Breeding female of today is very different than her counterpart of 20-30 years ago:合理的初生重合理的初生重High birth weight妊娠目标妊娠目标Goals Gestation合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况Sow feeding in gestation affects birth wt妊娠目标妊娠目标Goals Gestation合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况Sow feeding in gestation affects birth wt妊娠目标妊娠目标Goals Gestation妊娠目标为第妊娠目标为第5周母猪妊娠率达到周母猪妊娠率达到85-90%且体正常且体正常The goal of an effective gestation feeding program is to have 85-90%of the gestating sows in“normal condition by 5 weeks of gestation体况评分体况评分Body Condition Score15432过瘦过瘦Thin正常正常Normal过肥过肥Fat控制能量摄入控制能量摄入 Control Energy Intake饲喂量不足会导致饲喂量不足会导致:Under Feeding Causes:降低仔猪初生重降低仔猪初生重Decrease in pig birth weight断奶前死亡断奶前死亡PWM降低泌乳量降低泌乳量Decrease milk production影响繁殖性能影响繁殖性能Poor reproductive performance控制能量摄入控制能量摄入Control Energy Intake过量采食会导致：过量采食会导致：Over Feeding Causes:增加不必要花费增加不必要花费Unnecessary expense增加死胎率增加死胎率Increases embryonic mortality影响乳腺发育影响乳腺发育Reduces mammary development增加母猪死亡率和淘汰率增加母猪死亡率和淘汰率Increase sow mortality and culling rate减少泌乳期的采食减少泌乳期的采食Reduces lactation feed intake 妊娠期妊娠期 Gestation 妊娠期妊娠期 Gestation 妊娠期妊娠期 Gestation 妊娠期妊娠期 Gestation 母猪营养体系母猪营养体系 Sow Nutrition System了解不同胎次营养需求的差异了解不同胎次营养需求的差异Understand potential parity differences初产母猪繁育目标初产母猪繁育目标Breeding Gilt Goals初产母猪繁育目标初产母猪繁育目标Breeding Gilt Goals体重达到体重达到135-150 kgWeight at breeding 135 150 kg分娩分娩3胎以上产仔总数与母猪的配种体重的关系胎以上产仔总数与母猪的配种体重的关系Total born over 3 parities according to breeding weight Source:Williams et al,2005第一次配种体重第一次配种体重分娩分娩3胎以上总胎以上总仔猪数仔猪数分娩分娩3胎以上产仔总数与母猪的配种体重的关系胎以上产仔总数与母猪的配种体重的关系Total born over 3 parities according to breeding weight Source:Williams et al,2005第一次配种体重第一次配种体重分娩分娩3胎以上总胎以上总仔猪数仔猪数初产母猪繁育目标初产母猪繁育目标Breeding Gilt Goals体重达到体重达到135-150 kgWeight at breeding 135 150 kg第第2或第或第3次发情记录次发情记录2nd or 3rd recorded estrus初产母猪繁育目标初产母猪繁育目标Breeding Gilt Goals体重达到体重达到135-150 kgWeight at breeding 135 150 kg第第2或第或第3次发情记录次发情记录2nd or 3rd recorded estrus12.5头总产仔数头总产仔数12.5 total born合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况Sow feeding in gestation affects birth wt好的母猪管理最大限度地发挥仔猪的生产性能好的母猪管理最大限度地发挥仔猪的生产性能 Maximize performance of piglets on the sow 出生重、断奶前日增重与断奶体重的关系出生重、断奶前日增重与断奶体重的关系（25日龄断奶）日龄断奶）Birth Weight,Preweaning ADG,and Weaning Weight(25d)出生重出生重（公斤）（公斤）断奶重断奶重（公斤）（公斤）断奶前平均日增重断奶前平均日增重（克）（克）合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况Sow feeding in gestation affects birth wt好的母猪管理最大限度地发挥仔猪的生产性能好的母猪管理最大限度地发挥仔猪的生产性能 Maximize performance of piglets on the sow 初生重的提高可以提高断奶仔猪的存活率和体重初生重的提高可以提高断奶仔猪的存活率和体重Increased birth weight improves in crate survivability and weaning weights合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况 Sow feeding in gestation affects birth wt揭示现代母猪妊娠和泌乳的营养需要量揭示现代母猪妊娠和泌乳的营养需要量 Understand the nutritional needs of modern sows during gestation and lactation胚胎的生长需要胚胎的生长需要 Growth of fetus and associated tissues胎儿蛋白沉积胎儿蛋白沉积 Fetal Protein AccretionMcPherson et al.,2004合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况 Sow feeding in gestation affects birth wt揭示现代母猪妊娠和泌乳的营养需要量揭示现代母猪妊娠和泌乳的营养需要量 Understand the nutritional needs of modern sows during gestation and lactation胚胎的生长需要胚胎的生长需要 Growth of fetus and associated tissues乳腺组织的生长需要乳腺组织的生长需要 Mammary tissue乳腺蛋白沉积乳腺蛋白沉积 Protein in Mammary GlandJi,2004Protein,g/glandDays of Gestation合理的初生重合理的初生重High birth weight怀孕母猪的饲养影响初生重和健康状况怀孕母猪的饲养影响初生重和健康状况 Sow feeding in gestation affects birth wt揭示现代母猪妊娠和泌乳的营养需要量揭示现代母猪妊娠和泌乳的营养需要量 Understand the nutritional needs of modern sows during gestation and lactation胚胎的生长需要胚胎的生长需要 Growth of fetus and associated tissues乳腺组织的生长需要乳腺组织的生长需要 Mammary tissue头胎母猪的维持与生长头胎母猪的维持与生长 Maintenance and growth in case of gilts采食量最关键采食量最关键Feed intake is the key妊娠期饲喂方案妊娠期饲喂方案Gestation Options.妊娠早期和后期饲喂不同量的同种日粮妊娠早期和后期饲喂不同量的同种日粮One diet fed a different amounts in early and late gestation.同种妊娠日粮同种妊娠日粮One Gestation Diet妊娠早期和中期妊娠早期和中期Early and Mid Gestation (Day 0 85)1.8 2.0 kg/d 妊娠后期妊娠后期Late Gestation(Day 86 114)2.4 3.0 kg/d妊娠期饲喂方案妊娠期饲喂方案Gestation OptionsGestation Options.妊娠早期和后期饲喂不同量的同种日粮妊娠早期和后期饲喂不同量的同种日粮One diet fed a different amounts in early and late gestation.饲喂两种日粮饲喂两种日粮Two different diets 要点要点REMEMBER 不同胎次采食不同不同胎次采食不同 There are differences in NUTRITIONAL REQUIREMENT by parity妊娠目标为第妊娠目标为第5周母猪妊娠率达到周母猪妊娠率达到85-90%且体况正常且体况正常The goal of an effective gestation feeding program is to have 85-90%of the gestating sows in“normal condition by 5 weeks of gestation要点要点REMEMBER 不同胎次采食不同不同胎次采食不同 There are differences in NUTRITIONAL REQUIREMENT by parity妊娠目标为第妊娠目标为第5周母猪妊娠率达到周母猪妊娠率达到85-90%且体况正常且体况正常The goal of an effective gestation feeding program is to have 85-90%of the gestating sows in“normal condition by 5 weeks of gestation采食量最关键采食量最关键Feed intake is the key发挥乳猪生长潜力发挥乳猪生长潜力Maximize baby pig growth potential合理的初生重合理的初生重 High birth weight仔猪的生产性能始于母猪的饲养仔猪的生产性能始于母猪的饲养 Piglet performance starts with sow feeding gestation and lactation好的母猪管理最大限度地发挥仔猪的生产性能好的母猪管理最大限度地发挥仔猪的生产性能 Maximize performance of piglets on the sow What is baby pig growth potential.?断奶前平均日增重断奶前平均日增重,克克/天天ADG before weaningD2 体重体重Kg BWt D2日增重日增重 g/dADG d2-21 g/dD21 断奶重断奶重D21 weaning wt1.51905.11.52205.71.52506.21.52806.81.53107.4乳猪生长潜力乳猪生长潜力Growth Potential of Baby PigsArtificial rearing real genetic growth potential哺乳杯哺乳杯 Milk feeding Cups 保温栏保温栏Milk Feeding Pen 新生仔猪人工饲养的生长潜力新生仔猪人工饲养的生长潜力Potential Growth Rate of NeonatalPigs Using Artificial RearingCV 14%(n=16)Boyd et al.,1995Average Growth Rate,g/dMilk kg/d 10.8 15.3 18.4 19.4 22.2 26.0母猪日产奶量与断奶前乳猪平均日增重的关系母猪日产奶量与断奶前乳猪平均日增重的关系Sow Daily Milk Production&Preweaning Daily Gain断奶前平均日增重断奶前平均日增重（克）（克）母母猪猪日日产产奶奶量量（公斤（公斤/天）天）Standardized 10 pigs per litterWhat is reasonable expectation for milk production.?不同母猪哺乳期的性能不同母猪哺乳期的性能Differences in Pig Growth Rate and Milk Production Estimates for Prolific SowsPiglet ADG,g/pig/d 256 234 248 287 311Standardized 10 pigs per litterWhat are the keys to lactation success.?泌乳期泌乳期成功的关键成功的关键 Lactation Keys to Success进入分娩房时母猪体重和身体状态合适进入分娩房时母猪体重和身体状态合适Proper size and condition entering farrowing house采食量采食量!FEED INTAKE!真正自由采食真正自由采食“True ad libitum”feedingINTK Feeder饲喂系统对泌乳母猪性能的影响饲喂系统对泌乳母猪性能的影响Effect of system of feeding on performance of lactating sowsPeng,J.J.,S.A.Somes,and D.W.Rozeboom.J.Anim.Sci.2007,85:853-860人工人工HF自由采食自由采食 Self-fed母猪数母猪数 No.of sows5757平均胎次平均胎次 Average Parity2.702.77采食量采食量 Total Feed Intake,kg114124日采食量日采食量 ADFI,kg5.45.9泌乳期泌乳期成功的关键成功的关键 Lactation Keys to Success进入分娩房时母猪体重和身体状态合适进入分娩房时母猪体重和身体状态合适Proper size and condition entering farrowing house采食量采食量!FEED INTAKE!真正自由采食真正自由采食“True ad libitum”feeding明确营养需要明确营养需要Knowing Nutrient Needs试验目标试验目标Objectives研究实际生产条件下初产母猪泌乳期赖氨酸需要研究实际生产条件下初产母猪泌乳期赖氨酸需要To evaluate the optimum lysine level for lactating gilts under commercial research conditions.Lys req.?材料与方法材料与方法 Materials and Methods 初产母猪初产母猪 263 PIC(Camborough 22)1st parity gilts 5 种饲料种饲料 Allocated to 5 dietary treatments in CRD 0.95%Lysine 1.05%Lysine 1.15%Lysine 1.25%Lysine 1.35%Lysine每个处理每个处理50-55头母猪头母猪 Each treatment had 50-55 sows试验期试验期 16-22天天 Sows were on test for 16-22 days日粮赖氨酸水平对采食量的影响日粮赖氨酸水平对采食量的影响Effect of dietary lysine intake on ADFITrt effect P=0.23,SEM=0.16Average feed intake初产母猪初产母猪20天泌乳期的平均日采食量天泌乳期的平均日采食量ADFI(g/d)during 20 d lactation in P1 sowsGilts.!初产母猪初产母猪28天泌乳期的平均日采食量天泌乳期的平均日采食量Projected ADFI(g/d)during 28 d lactation in P1 sows要点要点REMEMBER 不同胎次采食不同不同胎次采食不同 There are differences in feed intake by parity第一胎母猪采食会少第一胎母猪采食会少0.5-2.0 kg/d Parity 1 females consume 0.5 to 2.0 kg/d less日粮赖氨酸水平对采食量的影响日粮赖氨酸水平对采食量的影响Effect of dietary lysine intake on ADFITrt effect P=0.23,SEM=0.16Average feed intake日粮赖氨酸对仔猪日增重的影响日粮赖氨酸对仔猪日增重的影响Effect of lys intake on piglet ADG(g/d)Trt P 0.02,Linear P 0.01;SEM=7.84日粮赖氨酸对仔猪日增重的影响日粮赖氨酸对仔猪日增重的影响Effect of lys intake on piglet ADG(g/d)Trt P 0.02,Linear P 10%0-10%体重增加体重增加 Gained Wt断奶至发情间隔断奶至发情间隔Weaned to Estrus Interval(d)7.42a5.52b4.66c断奶后断奶后7天配种率天配种率Sows bred by day 7(%)64.5a87.9b92.6b出生仔猪数出生仔猪数 Total Born11.8a12.83b13.04babcMeans within a row without a common superscript differ(P.05)Summary of 577 sows commercial unit日粮赖氨酸水平对初产母猪和仔猪的影响日粮赖氨酸水平对初产母猪和仔猪的影响Effect of Dietary Lysine on P1 Sow and Litter Performance总赖氨酸总赖氨酸 Total Lysine,%0.951.051.151.251.35采食量采食量 kg/d ADFI,kg/d5.425.705.665.415.66赖氨酸射入量赖氨酸射入量 Lysine intake,(g/d)53.558.964.365.270.0母猪体重变化母猪体重变化 Sow BWt change(kg)4.45.14.24.75.5断奶数断奶数 Pigs weaned/litter9.19.39.29.19.2日增重日增重 ADG(g/d)262265273281288断奶重断奶重 Pig weaning wt(kg)6.26.26.46.56.7断奶窝重断奶窝重 Litter weaning wt(kg)56.457.758.959.161.6Data represents 52 to 54 sows/treatment.What is 500 grams increase in wean wt worth.?断奶重越大断奶后生长速度越快断奶重越大断奶后生长速度越快0.1 kg at weaning=a saving of 1/2-1 day at slaughterCan you tell 100 g difference in weaning wt.?Can you track 1 day earlier to slaughter.?断奶重断奶重猪营养体系猪营养体系Swine Nutrition Systems母猪营养体系母猪营养体系 Sow Nutrition System 乳猪营养体系乳猪营养体系 Baby Pig Nutrition System 断奶后第一周生长状况对上市日龄的影响断奶后第一周生长状况对上市日龄的影响ADG first week post weaning 断奶后第一周内平均日增重断奶后第一周内平均日增重(g)(g)ADG first week post weaning Pollmann （1993)断奶后第一周生长状况对上市日龄的影响断奶后第一周生长状况对上市日龄的影响ADG first week post weaning 断奶后第一周内平均日增重断奶后第一周内平均日增重(g)(g)ADG first week post weaning Pollmann （1993)好的开始好的开始Better Start Faster Finish平均而言，断奶体重每增加平均而言，断奶体重每增加1kg可缩短出栏时间可缩短出栏时间4-5天天On average each 1 kg extra gain within 3 weeks post weaning reduced days to mkt by 4 5 days断奶仔猪的生理缺陷断奶仔猪的生理缺陷Physiological challenges to weaning the baby pig小肠结构的完整性小肠结构的完整性 Undeveloped small intestine酶系发育不完善酶系发育不完善 Enzyme production is immature断奶仔猪乳糖酶断奶仔猪乳糖酶Enzyme Development断奶仔猪的生理缺陷断奶仔猪的生理缺陷Physiological challenges to weaning the baby pig小肠结构的完整性小肠结构的完整性 Undeveloped small intestine酶系发育不完善酶系发育不完善 Enzyme production is immature产酸能力低产酸能力低 Acid production is immature免疫机能不健全免疫机能不健全 Immune system is not fully developed断奶仔猪免疫力断奶仔猪免疫力Immune System Development断奶初期断奶初期 Starter Program挑战挑战 Challenges从母乳到干饲料从母乳到干饲料 Transition from sows milk to dry feed断奶早断奶早 Weaning age健康健康/管理管理 Health/Management环境环境,病原病原,饲料变化等饲料变化等 Environmental stress,pathogen exposure,abrupt change in diet composition and physical state采食量减少导致增重慢采食量减少导致增重慢 Experience reduced wt gains due to reduced feed intake高档乳猪料高档乳猪料Criteria of Premium Baby Pig Feed提高后期生长提高后期生长 Growth performance饲料采食量好饲料采食量好Feed Intake抗拉稀抗拉稀 Minimize diarrhea减少断奶应激减少断奶应激 Reduce stress of weaning采食量最关键采食量最关键Feed intake is the key采食量最关键采食量最关键Feed intake is the key提高后期生长提高后期生长 Growth performanceTouchette al.,1997特殊原料与原料品质特殊原料与原料品质Special Ingredients&Ingredient Quality 极好的原料极好的原料 Excellent ingredient for baby pigs适口性好适口性好 Palatable易消化易消化 Highly digestible乳糖含量高乳糖含量高 High lactose content断奶仔猪料中乳清粉的使用断奶仔猪料中乳清粉的使用Dried Whey in Pig Starter Diets断奶仔猪乳糖酶断奶仔猪乳糖酶Enzyme Development日采食量日采食量ADFILactose Effect ADFI g/d Quadratic P 0.05;SEM=13Increasing Lactose,%LowHigh日增重日增重ADGLactose Effect ADG g/d Linear P 0.01;SEM=13LowHighIncreasing Lactose,%乳清粉的含量影响乳清粉的含量影响1-2周的性能周的性能ADFI,ADG,2 wks post weaning with or without Lactose(g/d)(克克/天天)5.3 Kg Weaning BWt乳清粉的含量影响后期乳清粉的含量影响后期3周的性能周的性能ADFI,ADG,wk 3 post weaning with or without Lactose(g/d)(克克/天天)Three diets 0,9,18%Dried Whey first 2 weeks post weaning common diet week 3高档乳猪料高档乳猪料Criteria of premium baby pig feed提高后期生长提高后期生长 Growth performance饲料采食量好饲料采食量好Feed Intake饲料采食量好饲料采食量好Feed Intake适口性好适口性好 PalatabilityAB适口性适口性适口性试验照片适口性试验照片仔猪哄抢正大代乳宝仔猪哄抢正大代乳宝正大代乳宝正大代乳宝高档乳猪料高档乳猪料Criteria of premium baby pig feed提高后期生长提高后期生长 Growth performance饲料采食量好饲料采食量好Feed Intake抗拉稀抗拉稀 Minimize diarrhea断奶仔猪料中乳清粉的使用断奶仔猪料中乳清粉的使用Dried Whey in Pig Starter Diets采食量最关键采食量最关键Feed intake is the key抗拉稀抗拉稀 Minimize diarrheaTouchette al.,1997断奶后饲喂断奶后饲喂Feeding after weaning断奶后饲喂 Feeding after weaning高档乳猪料高档乳猪料Criteria of premium baby pig feed提高后期生长提高后期生长 Growth performance饲料采食量好饲料采食量好Feed Intake抗拉稀抗拉稀 Minimize diarrhea减少断奶应激减少断奶应激 Reduce stress of weaning补饲的意义补饲的意义WHY CREEP FEED训练咀嚼固体饲料及适应气味训练咀嚼固体饲料及适应气味 Train piglets to accept solid feed刺激化道中各淀粉酶和蛋白酶活性刺激化道中各淀粉酶和蛋白酶活性 Induce enzyme production乳猪消化酶分泌及断奶应激乳猪消化酶分泌及断奶应激Digestive enzyme after weaningACP 010.1-PZ-95020 1 2 3 4 5 6淀粉酶淀粉酶 Amylase 脂肪酶脂肪酶Lipase 胰蛋白酶胰蛋白酶Trypsin周龄胰蛋白酶活性10 50(x1000)淀粉酶和脂肪酶活性资料来源:Lindeman et al 1986Weaning每头乳猪断奶前总采食量每头乳猪断奶前总采食量与断奶后与断奶后1周总采食量的关系周总采食量的关系Feed intake of the piglets during lactation,in relation to feed intake during the 7 d after weaning断奶后采食量断奶后采食量对对胰蛋白酶活力的胰蛋白酶活力的影响影响Trypsin activity(pancreas&jejunum)at d 6 post-weaning related to post-weaning FI02468101214161820断奶后断奶后0-6天平均日采食量天平均日采食量(g/d)Post weaning 6d ADFI g/d01208016028024020040320360400TotalTrypsinActivityunitsx1000Caroline A.Makkink,1993,Ph.D.thesisDepartment of Animal Nutrition,Agricultural University of Wageningen.补饲的意义补饲的意义WHY CREEP FEED训练咀嚼固体饲料及适应气味训练咀嚼固体饲料及适应气味 Train piglets to accept solid feed刺激化道中各淀粉酶和蛋白酶活性刺激化道中各淀粉酶和蛋白酶活性 Induce enzyme production增加产酸能力增加产酸能力Stimulate gastric acid production补饲的意义补饲的意义WHY CREEP FEED训练咀嚼固体饲料及适应气味训练咀嚼固体饲料及适应气味 Train piglets to accept solid feed刺激化道中各淀粉酶和蛋白酶活性刺激化道中各淀粉酶和蛋白酶活性 Induce enzyme production增加产酸能力增加产酸能力Stimulate gastric acid production肠肠壁壁发育发育Develop gut-villi 小肠吸收表面积小肠吸收表面积：小肠皱褶：X 3倍绒毛 X10倍微绒毛(毛刷邊界)X25倍=750 倍小腸摺皺微絨毛絨毛乳猪断奶前乳猪断奶前/后小肠结构之差异后小肠结构之差异The difference of intestinal structure of baby pig for Pre-weaning and Post weaning 断奶前断奶前断奶后断奶后 Pre-weaning Post weaning断奶后断奶后5 5天绒毛高度和采食天绒毛高度和采食量量的关系的关系_700600500400300200MEAN VILLOUS HEIGHT 总的采食干物质量总的采食干物质量(g/天天)Total Creep Intake 0 200 400 600|ooooooooooooooooooooooPluske,J.R.et al.,Dept.Of Animal Science,University of Alberta 1993补饲的意义补饲的意义WHY CREEP FEED训练咀嚼固体饲料及适应气味训练咀嚼固体饲料及适应气味 Train piglets to accept solid feed刺激化道中各淀粉酶和蛋白酶活性刺激化道中各淀粉酶和蛋白酶活性 Induce enzyme production增加产酸能力增加产酸能力Stimulate gastric acid production肠肠壁壁发育发育Develop gut-villi减少乳猪断奶应激减少乳猪断奶应激 Reduce weaning stress采食量最关键采食量最关键Feed intake is the key教槽迟早对教槽迟早对0-9日龄增重的影响日龄增重的影响 Creep Feeding Duration Effect on Postweaning Gain(day 0 9)教槽迟早对教槽迟早对10-21日龄增重的影响日龄增重的影响 Creep Feeding Duration Effect on Postweaning Gain(day 10 21)好的开始好的开始Better Start Faster Finish36 克克/天天*21 天天=756 克克36 g/d*21 d=756 g平均而言，断奶体重每增加平均而言，断奶体重每增加1kg可缩短出栏时间可缩短出栏时间4-5天天On average each 1 kg extra gain within 3 weeks post weaning reduced days to mkt by 4 5 days如何补饲如何补饲How to use creep feed越早越好，

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