膨化全脂大豆对仔猪生产性能和养分消化率的影响

根据遗传、性别、体重等相一致的原则,将30头35日龄断奶的杜洛克仔猪随机分为3个组,每组设2个重复,研究膨化全脂大豆对仔猪生产性能和饲粮养分消化率的影响。对照组以玉米豆粕等配制饲粮,试验1组以膨化全脂大豆替代50%的豆粕,试验2组以膨化全脂大豆替代全部豆粕,其他饲粮组成保持不变,进行40d的饲养试验。在试验第20d开始,连续收集粪便3d,测定饲粮养分消化率。结果表明,试验1组日增重比对照组提高了17．6％,差异显著（P〈0．05）,试验2组比对照组提高了7．4％（P〉0．05）;试验1组和试验2组饲料利用率分别比对照组提高11．7％和7．6％。试验2组干物质消化率显著高于对照组（P〈0．05）,蛋白质的消化率三个组基本接近,但含有膨化大豆的试验1组和试验2组的粗脂肪和粗灰分的消化率均比对照组有提高趋势。     

膨化全脂大豆对仔猪生产性能和养分消化率的影响

根据遗传、性别、体重等相一致的原则,将30头35日龄断奶的杜洛克仔猪随机分为3个组,每组设2个重复,研究膨化全脂大豆对仔猪生产性能和饲粮养分消化率的影响。对照组以玉米豆粕等配制饲粮,试验1组以膨化全脂大豆替代50%的豆粕,试验2组以膨化全脂大豆替代全部豆粕,其他饲粮组成保持不变,进行40 d的饲养试验。在试验第20 d开始,连续收集粪便3 d,测定饲粮养分消化率。结果表明,试验1组日增重比对照组提高了17.6%,差异显著(P<0.05),试验2组比对照组提高了7.4%(P>0.05);试验1组和试验2组饲料利用率分别比对照组提高11.7%和7.6%。试验2组干物质消化率显著高于对照组(P<0.05),蛋白质的消化率三个组基本接近,但含有膨化大豆的试验1组和试验2组的粗脂肪和粗灰分的消化率均比对照组有提高趋势。     

膨化全脂大豆及膨化玉米对仔猪生产性能的影响

根据性别、体况等相一致的原则,将30头30日龄断奶长大或大长仔猪随机分为3组,每组设2个重复(即设对照组、试验Ⅰ组、试验Ⅱ组)。对照组以玉米、豆粕等配制饲粮,试验Ⅰ组以膨化全脂大豆替代50%的豆粕,膨化玉米替代50%的玉米;试验Ⅱ组日增重以膨化全脂大豆替代全部豆粕,膨化玉米替代全部玉米,其它饲粮组成不变,进行40d的饲养试验。结果表明,试验Ⅰ组日增重比对照组提高了18·9%,差异显著(P<0·05);试验Ⅱ组比对照组提高了12·3%,差异显著(P<0·05);试验Ⅰ组和试验Ⅱ组饲料利用率分别比对照组提高了11·7%和6·5%。     

膨化全脂大豆替代部分豆粕饲喂断奶仔猪的效果试验

试验选用20头35日龄断奶的杜洛克仔猪，根据遗传，性别，体重等相一致的原则，随机分为2组，每组10头，对照组以玉米、麸皮，豆粕等配制饲粮，试验组以膨化全脂大豆替代50％的豆粕，其他饲粮成分完全相同，进行40d的饲养试验，结果表明，试验组日增重比对照组提高17．6％（P＜0．05）；饲料利用率提高11．7％；试验组毛利比对照组提高19．5％。     

膨化豆粕与全脂膨化大豆对仔猪生长性能、表观消化率和血清生化指标的影响

试验旨在研究普通豆粕、膨化豆粕和全脂膨化大豆粗蛋白质体外消化率的差异,以及以膨化豆粕和全脂膨化大豆替代玉米-豆粕型基础日粮中部分豆粕对仔猪生长性能、养分表观消化率、血清生化指标的影响。以胃蛋白酶-胰蛋白酶两步消化法测定体外消化率。动物试验选用108头初始体重为（10.10±0.57）kg的42日龄健康杜×长×大仔猪（公母各半）,按区组随机分为3组,每组6个重复,每个重复6头猪。对照组饲喂玉米-豆粕型基础日粮,膨化豆粕组以9.66%膨化豆粕替代对照组日粮中9.66%的豆粕,全脂膨化大豆组以12%全脂膨化大豆替代对照组日粮中9.66%豆粕和2.34%豆油。试验期为28 d。结果表明：膨化豆粕与全脂膨化大豆的体外粗蛋白质消化率均高于普通豆粕（P<0.05）,且膨化豆粕高于全脂膨化大豆（P<0.05）;与对照组相比,膨化豆粕组降低了仔猪耗料增重比（P<0.05）,其他生长性能指标无显著差异;与对照组相比,膨化豆粕组与全脂膨化大豆组均提高了干物质、总能、粗蛋白质、粗脂肪以及有机物的表观消化率（P<0.05）;膨化豆粕组血清中白蛋白含量高于对照组和全脂膨化大豆组（P<...     

膨化大豆对断奶仔猪生产性能的影响

浙江省粮食科学研究所的姜秋水和沈华在平湖众欣养殖场选取72头刚断奶的杜长嘉仔猪,随机分成2组,每组3个重复,每个重复12头(公母各半)。对照组饲粮组成(%):玉米60;豆粕25;次粉8.5;鱼粉3.5;磷酸氢钙1;预混料2。试验组饲粮组成(%):玉米60;豆粕20;膨化大豆5;次粉8;鱼粉4;磷酸氢钙1;预混料2。膨化大豆由萧山市启明星生物营养有限公司提供,粗蛋白质含量38.0%。营养水平均为DE13.21MJ/kg;CP19.27%。试验期30天。试验组和对照组饲养管理条件相同,自由采食和饮水。结果表明,试验组日增重比对照组提高7.54%,料重比和腹泻率分别下降6.95%和0.24个百…     

用膨化全脂大豆及膨化玉米饲喂仔猪效果观察

断奶仔猪由于代谢旺盛，生产潜力很大，对日粮能量要求较高，通常在仔猪日粮中添加脂肪可以满足仔猪对能量的要求。全脂大豆富含蛋白质，且脂肪含量高达16％～20％，因此是很好的高能量高蛋白饲料。因天然大豆中含有多种抗营养因子，如胰蛋白酶抑制因子、外源凝集素、促甲状腺素、低聚糖类等，这些抗营养因子大多不耐热，经高温挤压膨化后这些抗营养因子被破坏，从而提高了营养价值．同时膨化全脂大豆还含有特殊的香味，对要求配制适口性好、能量高的仔猪料来说，是理想的蛋白源。玉米是世界上最重要的粮食之一，其营养成分优于稻米、薯类等，缺点是颗粒大、食味差、黏性小。膨化玉米具疏松多孔、结构均匀、质地柔软特点，不仅色、香、味俱佳，且提高了营养价值和消化率。国内外对膨化全脂大豆、膨化玉米在仔猪日粮中的使用效果进行了不少试验。本试验选择长大或大长仔猪为对象，考察不同比例的膨化全脂大豆代替豆粕，膨化玉米代替玉米对仔猪生长和饲料利用率的影响。     

膨化全脂大豆对21日龄早期断奶仔猪生产性能的影响

膨化全脂大豆（ＥＦＳ）与豆粕（ＳＢＭ）相比 ,油脂含量相对较高 ,因而常作为氨基酸和能量饲料应用于畜禽日粮中。已有报道ＥＦＳ取代ＳＢＭ时 ,能改善断奶仔猪生产性能 ,但也有报道平均日增重（ＡＤＧ）和饲料转化效率（ＦＣＲ）不受影响。另一方面 ,越来越多的研究表明 ,对新生仔猪和断奶仔猪而言 ,日粮添加肉碱可能具有十分重要的意义 ,但其添加水平还不十分明确。本试验旨在比较ＳＢＭ与ＥＦＳ对早期断奶仔猪生产性能的影响以及添加不同水平的肉碱对ＥＦＳ利用的影响 ,为大豆加工产品和肉碱的有效利用提供依据。选２１日龄平均体重为５…     

不同温度膨化全脂大豆对仔猪氮平衡和氨基酸消化率的影响

本试验目的在于检测不同温度下蒸汽膨化的全脂大豆对仔猪氮平衡和氨基酸消化率的影响。2个氮平衡试验共用24头杂交去势公猪,平均体重5.1公斤,21日龄断奶时,在小肠末端手术安装T—形瘘管。所用基础日粮含1.25％赖氨酸,10％豆油。10％葡萄糖和浸提豆粕,利用经110℃、130℃和150℃蒸汽膨化处理的三种全脂大豆,以等氮和等赖氨酸来替代基础日粮中的豆粕,用玉米淀粉补足日粮的百分比。代谢试验室内安有自动控温和通风设备。每个氮平衡试验收集粪尿和食糜样本2期。结果表明,仔猪采食含有在130℃下膨化的全脂大豆日粮后,氮消化率高于(p<0.05)在110℃下膨化的全脂大豆。而经150℃膨化处理的大豆,氮存留量,氮消化率,氮存留量没有进一步的改善,经130℃膨化的全脂大豆其赖氨酸、蛋氨酸和异亮氨酸的回肠表观消化率,高于(p<0.05)经110℃和150℃处理的大豆。但是,苏氨酸、缬氨酸和亮氨酸的回肠末端表观消化率随膨化温度的升高而增加。本试验表明,全脂大豆经130℃蒸汽膨化处理有利于改善仔猪对大豆中赖氨酸、蛋氨酸和异亮氨酸的回肠表观消化率,可以改善氮沉积量和氮存留率,但与优质豆粕相比,效率不显著。     

膨化大豆对断奶仔猪生产性能的影响

试验选用 72头刚离乳的杜长嘉仔猪 ,饲喂玉米 -豆粕型基础日粮。随机分成 2组 ,试验组饲粮中添加 5%的膨化大豆部分替代日粮中的豆粕 ,试验期 30 d。结果表明 :与对照组相比 ,试验组日增重比对照组提高 7.54% ,料重比和腹泻率分别下降 6.95%和 1 4 .55%。     

Nutrient digestibility of extruded canola meal in ileal-cannulated growing pigs and effects of its feeding on diet nutrient digestibility and growth performance in weaned pigs

Canola meal (CM) contains less crude protein (CP) and more fiber and anti-nutritional factors such as glucosinolates than soybean meal (SBM) and consequently has a lower nutrient digestibility. Therefore, processing strategies that may increase the feeding value of CM warrant study. In two experiments, the effects of extrusion of Brassica napus CM on apparent (AID) and standardized ileal digestibility (SID) of amino acids (AA), apparent total tract digestibility (ATTD) of gross energy (GE) in growing pigs, and growth performance and diet digestibility in weaned pigs were assessed. Solvent-extracted CM was extruded using a single-screw extruder at three screw speeds: 250 (CM-250), 350 (CM-350), or 450 (CM-450) rpm. In exp. 1, in a double 4 × 4 Latin square, eight ileal-cannulated barrows (initial body weight [BW], 68.1 kg) were fed corn starch-based diets containing 50% CM or extruded CM. The CM sample contained 43.2% CP, 33.2% total dietary fiber (TDF), and 8.9 µmol of total glucosinolates/g on a dry matter (DM) basis. Extrusion increased (P < 0.05) the AID of CP, reduced (P < 0.05) apparent hindgut fermentation of CP, and decreased (P < 0.05) predicted net energy (NE) value of diets. Extrusion increased diet AID and CM SID of most indispensable AA by 3.1 to 5.3%-units. In exp. 2, 200 weaned pigs (initial BW, 8.3 kg) were fed diets containing 20% SBM, CM, or extruded CM starting 2 wk postweaning for 3 wk. The CM sample contained 42.7% CP, 28.3% TDF, and 5.3 µmol total glucosinolates/g DM. Wheat-based diets provided 2.3 Mcal NE/kg and 5.1 g SID Lys/Mcal NE. Dietary inclusion of extruded CM replacing SBM decreased (P < 0.05) diet ATTD of DM, GE and CP, and DE value. Average daily feed intake, average daily gain (ADG), and gain:feed (G:F) of pigs did not differ between extruded CM and SBM diets and were not affected by extrusion, but increasing extruder screw speed linearly increased (P < 0.05) ADG for day 1 to 7 and G:F for the entire trial. In conclusion, extrusion increased diet AID and CM SID of AA but not DE and predicted NE values of CM. However, increasing extruder speed did not further increase the SID of most of the AA of CM in growing pigs. Dietary inclusion of 20% CM or extruded CM did not affect the growth performance in weaned pigs.     

断奶仔猪饲喂紫花豌豆对日粮中养分的消化率和生长性能的影响

最大程度地在猪粮中用紫花豌豆代替豆粕(Soybean Meal,SBM)对生猪生产非常经济而且显得特别重要,本研究评估了在乳猪饲料中增加紫花豌豆含量替代SBM对日粮中养分的消化率和生长性能的影响。试验选取19日龄断奶后1周的乳猪260头(8.5 kg),阶段1进行2周(1~14 d),然后进行阶段2饲喂3周(15~35 d),并且用以小麦为主粮的每千克含有0,100,200,300和400 g紫花豌豆(Pisum sativum L.,subsp.hortense)的5种颗粒饲料代替含300 g/kg SBM和100 g/kg小麦饲料。两个阶段的饲料分别被设计成含有净能量(Net energy,NE)10.2和9.8 MJ/kg,同时使标准回肠可消化(Standardised Ileal Digestible,SID)赖氨酸含量为1.2和1.0 g/MJ NE。为平衡饲料中的NE,在两个饲喂阶段的日粮中将加拿大菜籽油含量分别从48和27减少到34和12 g/kg,并通过增加氨基酸结晶体平衡氨基酸含量。结果表明,当饲料中紫花豌豆含量增加到400 g/kg时,在阶段1粗蛋白(Crude Protein,CP)和总能量(Gross Energy,GE)的全消化道表观消化率(Apparent Total Tract Digestibility Coefficient,CATTD)分别被线性的降低了7%和2%(P0.001),但是在阶段2中,粗蛋白的CATTD只线性的降低了1%(P0.005)。与此同时,当饲料中紫花豌豆含量增加到400 g/kg时,日粮NE值在阶段1二次递减0.4 MJ/kg(P0.001),并在阶级2线性的减少0.2 MJ/kg(P0.001),但是用于饲料配方的紫花豌豆的NE值对于刚断奶的仔猪被高估了。在1~7 d,增加紫花豌豆的含量并不影响日均采食量(Average Daily Feed Intake,ADFI),但日增重(Average Daily Gain,ADG)和饲料转化效率(G:F)线性的减少了(P0.01);在8~14 d和15~21 d,生长性能并没有受到影响;在22~28 d,增加紫花豌豆的含量使ADFI和ADG二次递增(P0.01),但没有影响G:F;在29~35 d,增加紫花豌豆的含量时,ADFI只是趋向性线性增加(P0.10),但ADG却表现出线性增加(P0.05),同时没有影响G:F。在整个试验过程(1~35 d),增加饲料中紫花豌豆的含量并没有影响ADFI,ADG和G:F。因此得出结论,对于乳猪饲料,在配成等量的NE值和SID氨基酸后,400 g/kg紫花豌豆能够完全替代SBM,并且对断奶后经过7d的适应期的仔猪的生长性能没有不利影响。     

Growth performance,nutrient digestibility,and fecal microbial composition of weaned pigs fed multi-enzyme supplemented diets

A study determined the effects of supplementing corn-based diets for weaned pigs with multi-enzymes on growth performance, apparent total tract digestibility (ATTD) of nutrients, fecal score, and fecal microbial composition. A total of 132 pigs (initial body weight = 7.23 kg) that had been weaned at 21 d of age and fed a drug-free nursery diet for 7 d were housed in 33 pens of 4 barrows or gilts, blocked by body weight and gender, and fed 3 experimental diets at 11 pens per diet. The diets were corn-based diet without or with multi-enzyme A or B. Multi-enzyme A supplied 4,000 U of xylanase, 150 U of β-glucanase, 3,500 U of protease, and 1,500 U of amylase per kilogram of diet. Multi-enzyme B was the same as multi-enzyme A except that it supplied amylase at 150 U/kg, and that its source of amylase was different from that of multi-enzyme A. All diets contained phytase at 1,000 U/kg. The diets were fed for 35 d in 2 phases; phase 1 for the first 14 d and phase 2 for the last 21 d of the trial. Fecal score was determined daily during the first 7 d of the trial. Fecal samples were collected from rectum of 1 pig per pen on days 2, 7, 14, and 35 of the trial for determining bacterial composition. Also, fresh fecal samples were collected from each pen on days 41 and 42 to determine ATTD of nutrients. Multi-enzyme B increased (P < 0.05) average daily gain (ADG) for phases 1 and 2. For the overall study period, multi-enzyme B increased (P < 0.05) ADG from 262 to 313 g, and average daily feed intake (ADFI) from 419 to 504 g. Multi-enzyme A increased (P < 0.05) overall ADG from 262 to 290 g, but did not affect ADFI. Multi-enzyme A or B did not affect ATTD of gross energy, but increased (P < 0.05) the ATTD of ether extract from 30% to 36% or 37%, respectively. Multi-enzyme A did not affect fecal score; however, multi-enzyme B tended to decrease (P = 0.09) fecal score, implying that it tended to decrease diarrhea. Firmicutes were the most abundant phylum of fecal bacteria (its relative abundance ranged from 58% to 72%). Bacteroidetes and Actinobacteria were the 2nd and 3rd most abundant phyla of fecal bacteria. Neither multi-enzyme affected fecal bacterial composition. In conclusion, the addition of multi-enzyme A or B to phytase-supplemented corn-based diet for weaned pigs can improve their growth performance and fat digestibility. However, multi-enzyme B was more effective than multi-enzyme A in terms of improving the growth performance of weaned pigs fed corn-based diet.     

膨化全脂油菜籽粉对生长猪生产性能的影响

选择体重为20kg±2kg的健康杜×长×大生长猪60头,随机分为5处理（每处理3重复,每重复有4头猪）,分别饲喂0％、5％、10％、15％、20％膨化全脂油菜籽粉（EFFRM）日粮,各处理日粮中EFFRM以等能等可消化氨基酸基础取代大豆蛋白。试猪自由采食和饮水,试验期40d。试验用全脂菜籽为“双高”品种,采用干法膨化加工。试验结果显示：试猪采食量和日增重随日粮中EFFRM用量的增加呈先上升（5％用量）后明显下降（10％～20％用量）的规律;5％EFFRM处理的采食量和增重在数值上高于0％处理,差异未达显著水平（P〉0．05）,但显著高于10％处理（P〈0．05）,极显著高于15％、20％处理（P〈0．01）：各处理的单位增重耗料（FCR）无显著差异（P〉0．05）,在数值上仍以5％、0％处理最低。以上结果表明,20-40kg猪日粮中“双高”来源的EFFRM用量以5％为宜,用量10％及以上会显著影响猪的采食量,降低生长速度。     

Effect of feeding finishing pigs extruded full-fat soybeans on performance and pork quality.

This experiment was designed to test whether changing the type and amount of added dietary fat would affect performance or meat quality. Dietary fat was added as tallow or extruded full-fat soybeans (FFS). Isoenergetic diets containing 10% FFS, 20% FFS, or 4% tallow were fed for 3 or 6 wk before slaughther. A conventional corn-soybean meal diet served as a no-added-fat control. Each of the seven dietary groups contained 20 pigs, equally distributed among four pens, with barrows and gilts segregated. Significance of treatment, sex, and interaction effects were evaluated for 34 meat quality, composition, and sensory evaluation traits. Treatment x sex interactions were not detected (P greater than .05). Treatment main effects were detected for percentage of fat and water in the bacon and for lipid oxidation in bacon and the longissimus muscle. The 6 df for treatment were partitioned into six contrasts to test for the trends within and between diets. A trend toward reduced fat and increased moisture in bacon was detected in the 10% FFS diet over time (P less than .05). In general, lipid oxidation of bacon and longissimus muscle increased with level of FFS in the diet, length of time on the diet, and storage time of the meat. Although statistically significant, the magnitude of these effects was small and did not affect the sensory characteristics of longissimus muscle samples. It was concluded that short-term feeding of FFS before slaughter did not adversely affect animal growth or meat quality.     

蛋白与能量对断奶仔猪生长性能及消化率的影响

仔猪早期断奶是国内外集约化养猪生产中普遍关注的先进技术。它能提高母猪的繁殖率，减少疾病由母体向仔猪的传播，并能提高生长期的生产性能和胴体品质，目前国外养猪业发达国家已开始推广应用14日龄超早期断奶技术。但仔猪早期断奶时受心理、环境及营养应激影响，常表现为食欲差、消化功能紊     

营养水平对鲁农2号配套系生长肥育猪生长性能以及养分消化率的影响

为探讨鲁农2号配套系生长肥育猪适宜的能量和粗蛋白质需要量,试验采用单因子随机区组设计,在保持消化能/粗蛋白质比不变的基础上,设为高能量粗蛋白质、中能量粗蛋白质和低能量粗蛋白质3个处理组。选取健康、初始体重（49.58±1.49）kg的鲁农2号配套系生长肥育猪108头（公母各半）随机分3个处理,每个处理4个重复,每个重复（圈）9头猪。试验分为50～80 kg和80～100 kg两个阶段。结果表明,试验全期饲粮营养水平的降低对猪日采食量、日增重和料重比影响不显著,但50～80 kg低营养水平组日增重和粗蛋白质日摄入量显著低于高、中营养水平组。养分表观消化率,50～80 kg以低营养水平组最高,与中营养水平组相比,其干物质、有机物、粗蛋白质和能量的表观消化率分别提高6.97%、8.53%、10.48%和6.45%,差异显著。饲粮营养水平对钙和磷的表观消化率均无显著影响（P〉0.05）。80～100 kg不同营养水平组养分表观消化率差异显著,其中,高营养水平组养分表观消化率最高,其干物质表观消化率分别比中、低营养组提高5.49%和7.17%（P〈0.05）;有机物的表观消化率分别提高4.48%和6.07%（P〈0.05）;钙的表观消化率分别提高32.76%和27.93%（P〈0.05）;磷的表观消化率分别提高38.77%（P〈0.05）和17.44%;粗蛋白质的表观消化率比中营养水平组提高8.56%（P〈0.05）。综合考虑,在50～80 kg阶段,鲁农2号配套系生长猪适宜的消化能为12.98 MJ/kg、粗蛋白质为14.56%;80～100 kg阶段,鲁农2号配套系肥育猪适宜的消化能为12.98 MJ/kg、粗蛋白质为12.40%。     

Phyzyme XP phytase improves growth performance and nutrient utilization in wheat-based diets fed to weaned pigs

The effect of phytase (Phyzyme XP) on performance and nutrient utilization in piglets fed wheat-based diets was evaluated using 24 male pigs averaging 7 kg. Four experimental diets containing either 0 (positive control, adequate nutrients), 0 (negative control (NC), reduced nutrients), 500 or 1000 U/kg of phytase were used for each of two dietary phases (day 0 to 14 and day 14 to 33). Feed and water were provided ad libitum. Animals were weighed at weekly intervals until day 28 and feed intake (DFI) recorded daily. From day 28 to 33 pigs were fed at 3 times maintenance energy intake and DFI recorded. Total amounts of faeces and urine were recorded for each individually housed pig. Digestibilities and balance of dry matter (DM), phosphorus (P), calcium (Ca), nitrogen (N) and gross energy (GE) were calculated for feed, faeces and urine. Compared to the NC, daily live weight gain was improved (P < 0.05) for pigs receiving the highest level of supplemental phytase in phase 2. Phytase addition at 1000 FTU/kg also increased faecal digestibilities of P and Ca (P < 0.05). Contrasts comparing NC and Phytase diets showed that Ca (P < 0.02) and P (P < 0.05) balance were improved.     

二甲酸钾对断奶仔猪生产性能和养分消化率的影响

选择24日龄体况良好、平均体重为(7.09±0.09)kg 的 DLY 断奶仔猪 96 头,按性别、窝别相同原则随机分为 4 个处理,每个处理 6 个重复,每个重复 4 头,分别饲喂 A (不添加二甲酸钾)、B (添加 0.9 % 二甲酸钾)、C (添 1.8 % 二甲酸钾)和 D (添加 3.6 % 二甲酸钾) 4 种日粮,考察二甲酸钾对断奶仔猪生产性能和养分消化率的影响.试验期为 28d.在第 29 天每个重复屠宰 1 头猪.收集胃和回肠末端的食糜测定其 pH 值.结果表明:(1)断奶仔猪日粮中二甲酸钾的添加量为 0.9% 时.试验猪的日增重较日粮中添加 0%,1.8%和 3.6% 组相比分别提高了 14.1%(P＜0.1)、7.3%(P＞0.1)和15.0%(P＜0.1).(2)与日粮中二甲酸钾添加量为 0 %、1.8%和 3.6%相比,添加量为 0.9%的日粮中粗蛋白质的表现消化率分别提高了 4.7%(P%0.1)和2.32%(P＞0.1)和 5.96%(P＜0.1),而对能量与脂肪消化率差异不显著.(3)胃中 pH 值随着二甲酸钾添加量的提高而降低,而回肠末端的 pH 值无显著变化.(4)日粮中添加 3.6% 二甲酸钾时降低断奶仔猪的生产性能.     

氧化应激对断奶仔猪生产性能和养分利用率的影响

试验选用24头断奶仔猪随机分为4组,每组6个重复,每个重复1头猪,将过氧化物值(POV)为11.78meqO2/kg的新鲜鱼油(FFO)和POV分别为399.81、701.62、1065.74meqO2/kg的氧化鱼油(OFO)以3%的比例加入到断奶仔猪日粮中,饲喂4周,旨在建立以氧化油脂为氧化应激源的氧化应激动物模型,初探氧化应激对断奶仔猪生产性能和养分利用率的影响。结果表明,氧化应激降低试验猪只生产性能和养分利用率。与FFO组相比,以POV为1065.74meqO2/kg的氧化鱼油作用效果最明显。该过氧化程度的氧化鱼油可使平均日增重降低8.16%,饲料增重比提高9.22%(P<0.05);氮表观消化率和表观利用率分别下降21.91%(P<0.001)和30.55%(P<0.001);干物质和粗脂肪表观消化率分别降低13.05%(P<0.05)和35.18%(P<0.05)。结论:在断奶仔猪日粮中添加3%的POV为1065.74meqO2/kg的氧化鱼油可诱导氧化应激,引起生产性能和养分利用率的下降。