在回-直肠吻合猪日粮中添加可溶性糖对养分消化率的影响

为探明回－直肠吻合荷术猪日粮中补加可溶性糖的得失利弊，本文采用4头术后14周的回－直肠吻合猪，研究了在日粮中补加可溶性糖对养分消化率测值的影响，结果为：（1）在试验日粮中添加可溶性糖对于干物质的表观消化率有提高的趋势，但本试验条件差异不显著（P＞0．05）；（2）日粮中添加可溶性糖对氮的消化率和代谢率没有影响（P＞0．05）；（3）在日粮中添加可溶性糖对氨基酸的表观消化率测值没有影响（P＞0．05）。本研究表明在回－直肠吻合猪日粮中添加10％的可溶性糖不仅可以在一定程度上弥补回－直肠吻合荷术猪在能量代谢上的亏损，而且对氨基酸消化率的测值测有影响。     

回—直肠吻合荷术猪水和盐代谢规律研究

本试验用回—直肠吻合猪进行手术前后的对比试验 ,旨在研究回—直肠吻合术对于猪的水和盐代谢规律所产生的影响。以试验日粮分别于回—直肠吻合手术5天前和手术后15天定时、定量饲喂大莱公猪 ,连续收集3天试验猪的粪、尿样品 ,分别测定粪中的粗蛋白质、粗纤维及尿中的粗蛋白质和钾、钠、氯、钙离子含量。结果表明 :回—直肠吻合手术后 ,试验猪所排粪和尿的总量以及粪中的粗蛋白质、水分 ,尿中的粗蛋白质、钙离子含量与术前相比变化极显著(P<0.01) ;手术前后粪中的粗纤维及尿中的钠离子、氯离子含量差异显著(P<0.05) ;而手术对于尿中钾离子含量的影响不大(P>0.05)。     

回-直肠吻合猪的排泄频率及其对水的代谢变化

本文采用了4头回－直肠吻合猪和3头正常猪研究了回－直肠吻合手术后第4－28周荷术猪的排泄频率及水的代谢变化，并与同期的正常猪比较。结果为：（1）荷术猪手术后第4－28周，食糜的排泄频率逐渐降低，食糜排泄次数从术后第4周的9.21次／d逐渐降低到术后第28周的6.58次/d。荷术猪肛门中食糜的排泄频率为正常猪的2.85倍。同时随着猪只日龄的增长，正常猪粪便的排泄频率也有下降的趋势；（2）荷术猪排泄物的含水量为正常猪的2.90倍；荷术猪术后4－28周间，排泄物中的含水量基本稳定，正常猪粪便中含水量也并未随猪只日龄增长而发生明显变化。     

荷斯坦犊牛日粮能量代谢的研究

为研究犊牛的能量消化模式的转变、转化效率和代谢特点,选用3头2日龄的荷斯坦公犊进行消化代谢试验。试验结果表明,随着日龄的增加犊牛日粮能量的消化率逐渐下降,平均消化率为73.73%,消化能的代谢率在0～3月龄相对稳定,3～5月龄逐渐下降,6月龄时恢复到正常水平,平均代谢率为84.68%,总能的代谢率在0～5月龄逐渐下降,6月龄时有所恢复,总能的平均代谢率平均为62.68%,尿能占消化能的比例平均为11.44%,甲烷能占消化能的比例在0～4月龄之间逐渐升高,然后逐渐下降,平均为3.65%。产热量占消化能的比例呈现先升后降的趋势,平均为43.86%,沉积能占消化能的比例平均为41.01%。平均犊牛绝食代谢产热量为395.71 kJ/kg W^0.75,增重需增重净能10.97 MJ/kg。结果表明,犊牛每kgW^0.75的平均产热量大于成年牛,而每kg增重需增重净能低于成年牛。     

鸡、猪对血粉的氨基酸真消化率及其受蛋白酶调控影响的研究

本研究用去盲肠鸡和回—直肠吻合猪评定了饲用蒸煮血粉的氨基酸真消化率(TAAD),并探讨了添加酸性蛋白酶对蒸者血粉TAAD的调控效应。结果表明,蒸煮血粉平均TAAD在鸡(69.0％)明显低于猪(81.9％),而平均TAAD的酶促消化调控效应在鸡(11.2个百分点)明显高于猪(1.7个百分点)。     

日粮添加麦饭石对生长猪消化代谢的影响

为了研究添加单纯麦饭石及强化微量元素麦饭石的营养效果,配制4个处理的日粮,即基础日粮组、3%湖南麦饭石(HMF)组、3%中华麦饭石(CMF)组、0.5%湖南麦饭石+微量元素(HMFME)组,选用4头杜洛克×长白二元杂交猪,采用4×4拉丁方设计进行消化代谢试验,分别测定了4种日粮的营养物质消化代谢率。结果,4种日粮中,麦饭石补加了微量元素的HMFME日粮效果最好,对营养物质的消化和代谢均有明显改善,除NDF外,HMFME日粮各种常规营养物质消化率显著高于其它3种日粮(P<0.05),干物质、有机物、能量、粗蛋白、酸性洗涤纤维的消化率比基础日粮分别提高3.89%、4.24%、5.54%、8.17%、34.2%,比单一湖南麦饭石日粮分别提高7.85%、4.87%、5.93%、11.47%、41.6%。各种氨基酸消化率,不管是必需氨基酸还是非必需氨基酸消化率均显著高于另外3种日粮(P<0.05),其中第一氨基酸赖氨酸、第二限制性氨基酸蛋氨酸和总必需氨基酸(EAA)的消化率比基础日粮分别高11.41%、44.17%、15.94%,比单一湖南麦饭石日粮则分别高10.08%、23.34%、12.63%。两个单一添加麦饭石的日粮,营养物质消化代谢结果几乎完全一致,单一添加麦饭石对营养物质的消化率没有明显影响,但可明显改善营养物质在体内的代谢,能量和蛋白质代谢的各种营养指标均显著地高于对照的基础?     

猪消化代谢试验对糙米营养价值的评定

采用猪消化代谢试验法，以体况健康正常的、体重45kg左右的湖北白猪Ⅳ系3头去势后的公猪做两期试验：Ⅰ期为基础日粮试验，Ⅱ期为基础日粮加糙米试验，研究糙米的营养价值。试验结果：糙米的总能、消化能、代谢能分别为16.76、14.59±0.08、13.56±0.16MJ／kg；无氮浸出物含量及其表观消化率分别为72.22％、96.73±2.27％；粗蛋白含量及其表观消化率、表现代谢率分别为8.80％、73.71±3.17％、65.03±3.16％；氨基酸总含量及其表观消化率、表观代谢率分别为8.57％、74.43%、70.97％。试验结果表明糙米作为能量饲料喂猪是可行的。     

6岁梅花鹿生茸期饲粮适宜钙水平的研究

本试验研究了饲粮中不同钙水平对6岁生茸期梅花鹿的钙、磷、氟消化代谢的影响。选4头健康、生茸正常的6岁生茸期梅花鹿 ,分别放入4个特制的消化代谢笼中 ,接受4个钙水平(Ⅰ:0.74 %、Ⅱ :0.92 %、Ⅲ :1.09 %、Ⅳ :1.27 %)的饲粮处理 ,按4×4拉丁方设计进行钙平衡试验。试验结果表明 :4个饲粮钙水平对钙的消化率和代谢率的影响 ,均以第Ⅰ组效果较好 ,但各组间差异不显著(P>0.05) ;而对磷、氟的消化率和代谢率影响显著(P<0.05) ,这些指标均随钙水平提高而降低 ;对血清钙、磷、羟脯氨酸(HPY)的含量、碱性磷酸酶(AKP)活性和尿羟脯氨酸含量的影响各组间差异均不显著(P>0.05)。综合上述结果 ,在本试验设计范围内 ,6岁梅花鹿生茸期饲粮适宜钙水平和钙磷比分别为0.74 %、1.54 :1     

回直肠吻合法与“桥”式瘘管法测定猪饲料营养物质回肠消化率比较研究

通过收集回肠食糜测定消化率已成为一种估计氨基酸消化率的通用方法。在本试验中,对用回直肠吻合(IRA)猪替代“桥”式瘘管法(IC)进行了探讨。在这个试验中,12头大约克×长沙大围子猪(45kg)被用于回直肠吻合法测定,并与作为对照的“桥”式瘘管法进行了比较。试验共测定了3种混合日粮和3种单一日粮:大豆饼日粮(SBMD)、菜饼日粮(RSMD)、中国普通日粮(CCCD)、鱼粉(FM)、生大豆(RSB)、单细胞蛋白(SCP)。试验采用6×6拉丁方设计。结果表明,除了SBMD和RSMD的干物质消化率(DMD)、SBMD和CCCD的有机物消化率(OMD)、CCCD的缬氨酸外,IRA和IC两种方法测得的干物质、有机物、粗蛋白、各种氨基酸的消化率相似;除了干物质显著相关(P<0.05)以外,两种方法测得的养分消化率呈极显著相关(P<0.01);荷术猪与未作手术的对照猪在生长上没有不同,盲肠和结肠极显著变轻(P<0.01),而直肠则极显著延长并加重(P<0.01);一般地说,鱼粉的营养物质消化率最高,混合日粮的粗蛋白和各种氨基酸的消化率比大豆和单细胞蛋白高;大豆和单细胞蛋白的营养物质回肠消化率几乎相同。     

泌乳水平对奶牛日粮及羊草能量、氮代谢及瘤胃甲烷排放量的影响

试验旨在研究泌乳水平对奶牛日粮及羊草能量、氮代谢及甲烷排放规律的影响。试验采用单因素随机分组设计,分为干奶牛组(A组)、15 kg/d产奶牛组(B组)、27 kg/d产奶牛组(C组),每组4头,各试验牛的体重、年龄、胎次相近的,产奶牛处于相同泌乳阶段。采用间接法(套算法)测定羊草的能量及瘤胃甲烷产量。结果表明:能量代谢方面,随着泌乳水平的提高,日粮的能量消化率和代谢率随泌乳水平的升高而显著下降;羊草的消化能、代谢能、净能值以及瘤胃甲烷产生量随着泌乳水平的升高而显著下降(P<0.05)。日粮氮的消化率和代谢率随着泌乳水平的升高而显著下降(P<0.05)。A、B组和C组中,羊草的氮消化率分别为68.17%、66.64%和64.31%,A组的氮消化率、可消化氮显著高于C组(P<0.05);羊草氮代谢率及可代谢氮量随着泌乳水平升高而显著下降(P<0.05)。由此可知,奶牛泌乳水平对日粮及羊草的能量、氮代谢及瘤胃甲烷产量有显著影响。     

The effect of texturized vegetable protein from soy on nutrient digestibility compared to beef in cannulated dogs

Texturized vegetable protein from soy (TVP) is widely used in canned dog foods, but its nutritional value remains in doubt. This study compared apparent prececal and total intestinal digestibility when four canned diets containing reciprocal proportions of protein from TVP (0 to 57%) and from beef (100 to 43%) were fed to eight cannulated dogs. As dietary TVP increased, the following linear changes were observed (P < 0.05): prececal and total intestinal protein digestibility decreased slightly from 77 to 71% and 86 to 80%, respectively; prececal amino acid digestibility decreased in parallel with protein; prececal carbohydrate digestibility decreased markedly from 80% to 62% and carbohydrate disappearance in the large intestine increased from 8 to 22%; prececal sodium digestibility decreased markedly (from 37 to 4%); and prececal potassium digestibility decreased (from 93 to 85%). Total intestinal digestibility of sodium and potassium decreased little (from 97 to 95% and from 98 to 97%, respectively); fecal mass and water content increased markedly (from 98 to 174 g/d and from 61 to 72%, respectively); and fat digestibility was unaffected. Prececal phosphorus digestibility from two diets containing TVP was lower than that from the all-beef diet (13 and 17%, vs 26%, P < 0.05). In conclusion, TVP is a useful source of protein in canine canned diets because amino acids from TVP are almost as digestible as those from beef in the canine intestine. Nevertheless, soy carbohydrate is poorly digested and large amounts of TVP inhibit small intestinal electrolyte digestibility and increase fecal water content.     

The digestibility of milk substitutes with various soybean products in young calves

Digestibility trials were performed to study the suitability of mixtures made up of treated soybean and whey powder for replacing skim milk powder. Three different milk replacers were used, the replacers T-18/II and T-18/III containing Plyllac preparations manufactured by different technologies. When using the T-18 preparation with 18% fat content it was found that the protein source may contain 25% Plyllac preparation and 11% sweet whey powder. In two cases, at the age of 5 and 7 weeks, the digestibility of the crude protein in the T-18/II preparation was found to deteriorate significantly. For this reason, the authors suggest this milk replacer to be used from the 5th week of life. Trials were performed with 3 milk replacers (lactine preparations) containing Plyllac preparations of different manufacturing technology (35%), treated soybean (10%) and sweet whey powder (10%). It was found that the use of Plyllac preparations, i.e. of treated soybean in larger amounts causes the nutrient digestibility, mainly that of crude protein, to be significantly lower at the age of 3 and 5 weeks than that at the age of 7 to 9 weeks. No significant differences were found in the digestibility of the various Plyllac preparations manufactured by different technologies. The milk replacer lactine is recommended for use from the 5th week of life on.     

直接法和回归法测定玉米青贮对肉牛有效能值的研究

旨在应用直接法和回归法测定肉牛玉米青贮的消化能、代谢能和净能值,并探讨精料回归法用于估测肉牛单一粗饲料原料能值的可行性。试验选取12头体况良好、体重相近[(259±14.08)kg]的生长期公牛,随机分为3组,每组4头牛。分两期试验进行,试验一按试验牛自由采食量的95%、80%和60%3个水平饲喂全玉米青贮日粮;试验二在固定玉米青贮投喂量的基础上,各组分别按青贮饲喂量的15%、25%和50%(干物质基础)添加精料补充料。试验每期14d,其中前10d为预饲期,后4d为正试期。正试期消化代谢和呼吸代谢试验同期进行,测定玉米青贮对肉牛能量代谢规律。结果表明:1)肉牛对全玉米青贮日粮的各种营养物质消化率和能量消化率及代谢率随饲喂水平的提高总体逐渐降低;肉牛能量采食量(总能、消化能、代谢能和净能)随饲喂水平的提高逐渐升高,组间差异显著(P0.05)。2)玉米青贮对肉牛的消化能、代谢能和净能值随着饲喂水平的提高呈下降趋势,各有效能值变化范围分别为10.58~11.48 MJ/kg,8.33~9.44 MJ/kg和5.20~6.21 MJ/kg。3)添加精料补充料显著提高了肉牛对日粮的干物质采食量和粗蛋白消化率(P0.05),而洗涤纤维消化率精料添加比例组间差异不明显(P0.05);随着精料添加比例的增加,肉牛对日粮的能量采食量(总能、消化能、代谢能和净能)和能量消化率及代谢率逐渐上升,消化能代谢率各组之间无显著差异(P0.05)。4)根据试验日粮有效能值与精料添加量之间的关系建立线性回归方程后,外推估测得玉米青贮的消化能、代谢能和净能值分别为10.53 MJ/kg、8.29 MJ/kg和5.35MJ/kg,与95%饲喂水平组直接测定结果(10.58 MJ/kg、8.33 MJ/kg和5.20 MJ/kg)差异不显著(P0.05)。综上所述,回归法测定玉米青贮对肉牛的有效能值与直接法测定结果差异不明显,精料回归法可以用于估测肉牛单一粗饲料的有效能值。     

紫貂育成期饲用干配合饲料对其生长发育和营养利用率的影响

依据紫貂育成期饲粮适宜能量及蛋能比的研究结果,按原料比例不同,共设4个干配合料试验日粮配方。选用60～70日龄紫貂100只,随机分配到4个试验组和对照组(每组雄貂12只,雌貂8只)内。各试验组干配合料占日粮比例(占总能的％)为21％,对照组全喂鲜料。在饲养试验中期对40只幼貂(每组选雄貂4只,雌貂4只)进行消化代谢试验。结果表明,各试验组与对照组之问增重、毛皮质量、死亡率及自咬症发病率差异均不显著。各试验组与对照组间在能量消化率、能量代谢率上差异显著(P<0.05)或极显著(P<0.01)。各试验组蛋白质消化率与对照组间差异极显著(P<0.01),而代谢率各组间无显著差异(P>0.05)。综合分析表明,干配合饲料可部分替代鲜料。     

Influence of cellulose fibre length on faecal quality,mineral excretion and nutrient digestibility in cat

In dogs, faeces quality and nutrients digestibility were affected by different types of cellulose ( Wichert et al., 2002 ). In this study, it was investigated whether there are comparable effects of cellulose type in cats. Seven adult, healthy cats were fed a moist commercial complete cat food with three different cellulose type added at a level of 4% for a 1 week period. Faeces quality was between 1 and 3 on the scale used from 1 to 5. The addition of long fibre cellulose resulted in significantly firmer faeces. Addition of cellulose decreased the digestibility of dry matter and energy, whereas the impact on protein and fat digestibility was not significant. The type of cellulose affected faecal bulk and faecal water excretion. Faecal excretion of sodium and potassium was exponentially correlated to faecal water, faecal bulk and to a lesser extent to faecal dry matter excretion. Faecal calcium, magnesium and phosphorus excretion showed an exponential correlation to faecal dry matter excretion. A weaker correlation existed in all three elements to faecal bulk, whereas the effect of faecal water excretion was small. Results suggest a remarkable likeness between cats and dogs with regard to the digestive physiology of major minerals.     

Effect of dietary supplements of sodium or potassium bicarbonate on short-term macromineral balance in swine

Four crossbred barrows, weighing an average of 26 kg each, were fitted with simple T-cannulas in the terminal ileum and placed in metabolism cages to evaluate the effect of dietary supplements of NaHCO3 or KHCO3 on the short-term metabolism of sodium (Na), potassium (K), calcium (Ca), magnesium (Mg) and chloride (Cl). A control diet containing 2.8 g/kg Na and 4.1 g/kg K was compared with similar diets supplemented with either 13 g/kg or 26 g/kg NaHCO3 or 30 g/kg KHCO3. All diets contained 4 g/kg Cr2O3 as an external marker and were offered twice daily (1,100 g X pig-1 X d-1) in a 4 X 4 Latin square arrangement. Feces and total urine output were collected for 24 h on the fifth day after introducing a new diet; digesta was collected for 12-h periods on d 6 and 7. Sodium and K concentrations at the terminal ileum were unaffected by dietary treatment. Apparent ileal digestibility of Na was increased by NaHCO3 supplements. Over the total gastrointestinal tract, diet had no affect on apparent Na digestibility. Urinary Na clearance was increased by NaHCO3 in the diet in a dose-dependent manner. Net Na retention (g/d) was increased by NaHCO3. Apparent ileal digestibility of K was increased by KHCO3. Apparent fecal digestibility of K was increased by KHCO3 and NaHCO3. Urinary K clearance was elevated by KHCO3, but not enough to overcome the increased K intake; net K balance (g/d) rose in response to dietary KHCO3 supplements. Sodium bicarbonate or KHCO3 had no effect on short-term digestibility or balance of Mg, Ca or Cl.(ABSTRACT TRUNCATED AT 250 WORDS)     

Effects of tallow on the energy metabolism of wethers fed barley finishing diets

A balance trial was conducted to titrate the effects of tallow on the energy metabolism of wethers fed barley finishing diets. Six dietary levels of tallow (0, 2, 4, 6, 8, or 10%) in a barley finishing diet were fed to six crossbred wethers (35+/-1.1 kg) in a randomized complete block design. Diets were 73% barley, 10% tallow and(or) bentonite, 10% alfalfa pellets, and 7% supplement. There was no effect of tallow level on OM intake (1,103.1+/-51 g/d), OM digestibility (84+/-0.9%), GE digestibility (83+/-1.1%), or cell solubles digestibility (84.2+/-1.2%). The level of tallow quadratically decreased ADF digestibility (P < 0.05), methane emissions, and methane energy as a percentage of GE P < 0.01). There were linear increases in dietary GE (megacalories per kilogram of OM [P < 0.01]), dietary DE (megacalories per kilogram of OM [P < 0.05]), and dietary ME (megacalories per kilogram of OM [P < 0.01]), as dietary tallow increased. Numbers of ruminal protozoa (Entodinium spp. and Polyplastron sp.) decreased linearly (P < 0.05) with increased level of tallow. The energy value of tallow (calculated by difference) was low. The total-tract fatty acid digestibility of tallow was calculated by linear regression, without intercept, after accounting for the fatty acids digested from the base diet (0% tallow fed to a wether in a period). Fatty acids of the same carbon length were pooled for the regression analysis. All linear regressions were significant (P < 0.10) indicating no effect of tallow level on fatty acid digestibility. Lauric acid had low digestibility. The high digestibility of all C16 (89%) and C18 (104%) fatty acids suggests an effect of tallow on endogenous and microbial fatty acid excretion. Fatty acid digestibility was probably a minor contributor to the low energy content of tallow, calculated by difference, in these diets.     

The use of a partly-hydrolysed straw meal for the feeding of weaned piglets. 1. Increased production and feed expense as well as nutrient digestibility and buffer capacity in rations with various high portions of partly-hydrolysed straw meal

In studies with weaned piglets of the land race the usability of partly hydrolysed straw meal (PSM) in concentrate - straw meal mixtures was tested over a period of 56 days (42nd-98th day of life; 1st-8th week of feeding. The hydrolysed straw product was there tested in a parallel experiment each without and after neutralization (by means of CaCO3) in quotas of 5, 10 and 15% as supplement to the concentrate feed (based on dry matter) in comparison to a sole concentrate feeding. Daily weight gain and feed and energy expenditure as well as nutrient digestibility and the buffer effect of the PSM rations were ascertained. Measured by weight gain, feed intake and concentrate- and energy expenditure related weight gain, a 10% quota of partly hydrolysed straw meal in a period near weaning (1st-4th week of feeding) had the highest effect and was far superior to traditional concentrate feeding. Lower quotas of PSM in this period did not show a sufficient dietetic effect (diarrhea symptoms), higher reduced the effect on the performance parameters. In the period more remote from weaning (5th-8th week of feeding) the effect of the straw meal integration was generally reduced, a quota of about 5% proved optimal. The registered higher daily weight gains in the total test period (1st-8th week of feeding in which concentrate - straw meal mixtures (relative 106-130%) were closely related to the daily intake of digestibility organic matter. The decrease in digestibility of organic matter in the total ration remained small with the use of the well fermentable crude fibre from the hydrolysed straw product and the balance was overcompensated by higher feed intake. A pH-value decrease of the feed mixtures and a physiologically suitable influence on the pH-value in the stomachs of the test animals could be ascertained due to the buffer capacity of the hydrolysed straw products used. With regard to this, the non-buffered hydrolysed straw product had a higher effect, which was, among other things, reflected in higher performances.     

Influence of sodium bicarbonate and magnesium oxide on digestion and metabolism in yearling beef steers abruptly changed from high forage to high energy diets

Eight rumen-cannulated steers (initial wt 330kg) were adapted to a mixed alfalfa-grass hay diet for 30 d and abruptly changed to complete mixed diets of corn silage, snapped ear corn and a corn-based supplement to determine the effects of buffers on diet adaptation, digestion and ruminal metabolism. The diets contained: 1) no buffer, 2) .5% magnesium oxide (MgO), 3) 1.0% sodium bicarbonate (NaHCO3) and 4) .5% MgO and 1.0% NaHCO3, as a percentage of diet dry matter (DM). Digestion, metabolism and ruminal characteristics were measured in each of 2 wk immediately after the diet change. The animals were then adapted to the mixed alfalfa-grass hay diet, re-randomized and assigned to the four diets, thus four steers consumed each diet. Intakes and digestibilities of DM were generally greater for the diets containing buffers. The most notable differences were a greater DM intake with added NaHCO3 and an improved DM digestibility with added MgO. The higher DM digestibility with MgO was apparently related to improved neutral detergent fiber (NDF) and starch digestion. Fecal pH was significantly increased with MgO addition. Because of the greater intake and digestibilities, the amount of DM, NDF, and starch digested tended to be greater for the buffered diets. There were no diet X week interactions for intake and digestibilities, thus the responses observed existed during both wk 1 and 2 after the change in diets. In general, intake and digestibilities were greater in wk 2 than in wk 1 for all diets.(ABSTRACT TRUNCATED AT 250 WORDS)     

不同乳糖添加量对早期断奶仔猪全价料中营养物质消化率和仔猪生产性能影响的研究

将6窝(共58头)1日龄长大哺乳仔猪分三个阶段进行试验,结果表明:7～21日龄阶段,两处理组间营养物质消化率差异不显著(P>0.05),哺乳仔猪的平均日增重差异不显著(P>0.05);22～40日龄阶段,2.0%乳糖组中营养物质消化率极显著低于4.0%乳糖组(P<0.01),4.0%乳糖组仔猪平均日增重显著高于2.0%乳糖组(P<0.05);在41～60日龄阶段,1.0%乳糖组蛋白质、粗纤维、总磷、铜和铁的消化率极显著低于3.0%乳糖组(P<0.01),3.0%乳糖组仔猪平均日增重显著高于1.0%乳糖组(P<0.05)。