首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献，搜索用时 31 毫秒
1.
选用21日龄左右健康无病、初重基本一致的杜长大猪进行饲喂试验，随机分为5组，每组3个重复，每重复8头猪，自由采食和自由饮水。试验设计为：第Ⅰ组为对照组，第Ⅱ、Ⅲ组在每千克基础日粮中分别加入250、500 mg糖萜素，第Ⅳ、Ⅴ组在每千克基础日粮中分别加入250 mg糖萜素+4 mg黄霉素、4 mg黄霉素。结果表明：①第Ⅱ、Ⅲ、Ⅳ、Ⅴ组的平均末重较对照组分别提高4.00%、12.30%、5.21%、2.64%，平均日增重第Ⅲ组显著高于对照组(P<0.05)。与第Ⅱ、Ⅴ组相比，第Ⅳ组可提高饲料转化率，表明糖萜素与黄霉素具有一定的协同作用。②盲肠中大肠杆菌，各试验组均有一定的抑制作用，尤其是第Ⅳ组效果最好；结肠、直肠中大肠杆菌，试验组Ⅱ、Ⅲ、Ⅳ显著低于对照组Ⅰ和Ⅴ（P<0.05），其中Ⅲ组大肠杆菌含量最低（P>0.05）。处理Ⅲ能显著增加盲肠中双歧杆菌数（P<0.05），处理Ⅳ能显著增加盲肠中乳酸杆菌数（P<0.05），各处理组与对照组相比，均能增加结肠和直肠中双歧杆菌数和乳酸杆菌数，但差异不显著（P>0.05）。  相似文献   

2.
本试验旨在研究枯草芽孢杆菌对肉鸡生长性能、抗氧化功能和肠道形态的影响。选取1日龄雄性爱拔益加(AA)肉鸡420只,随机分为4组,每组7个重复,每个重复15只鸡。对照组饲喂基础饲粮,枯草芽孢杆菌组在基础饲粮中添加200 g/t枯草芽孢杆菌,杆菌肽锌组在基础饲粮中添加250 g/t杆菌肽锌,枯草芽孢杆菌+杆菌肽锌组在基础饲粮中添加200 g/t枯草芽孢杆菌和250 g/t杆菌肽锌。试验期42 d。结果表明,与对照组相比,饲粮中添加枯草芽孢杆菌显著提高了22~42日龄肉鸡的平均日增重(ADG)和血清丙二醛(MDA)含量(P<0.05),显著降低了1~21日龄肉鸡的ADG、平均日采食量(ADFI)及血清超氧化物歧化酶(SOD)活性和空肠隐窝深度(P<0.05)。饲粮中添加枯草芽孢杆菌和杆菌肽锌对22~42日龄肉鸡的料重比(F/G)、1~42日龄欧洲效益指数和肝脏MDA含量有显著交互作用(P<0.05)。综上所述,饲粮中添加200 g/t的枯草芽孢杆菌能提高22~42日龄肉鸡的生长性能,在一定程度上改善肉鸡空肠黏膜形态;饲粮中添加200 g/t的枯草芽孢杆菌和250 g/t的杆菌肽锌能够提高肉鸡的生长性能。  相似文献   

3.
The effect of dietary Echinacea purpurea on performance, viremia, and ontogeny of the humoral antibody response against porcine reproductive and respiratory syndrome virus (PRRSV) infection was evaluated in weaned pigs. In three replicates, 120 weaned pigs (25 +/- 1 d of age; 8.46 +/- 0.48 kg of BW) from a PRRSV-naive herd were allotted randomly to one of eight pens (diets) in two separate rooms (four pens/room), with each pen containing five pigs. Pigs began one of four dietary treatments (as-fed basis) 1 wk before inoculation with PRRSV: 1) basal diet composed of corn, soybean meal, whey, and essential vitamins and minerals; 2) basal diet plus carbadox (0.055 g/kg of diet; as-fed basis); 3) basal diet plus Echinacea 2% (2% of the total diet); 4) basal diet plus Echinacea 4% (4% of the total diet). The diets were formulated to be isocaloric and isolysinic. Echinacea purpurea was purchased in powder form and determined by chemical analysis to contain 1.35% cichoric acid (as-fed basis). Seven days after starting the diets, all pigs in one room were intranasally inoculated with PRRSV isolate ATCC VR-2332 at a concentration of 10(4) tissue culture infectious dose50/mL. To monitor the effects of Echinacea and PRRSV challenge, BW and blood samples were obtained from all pigs at 7-d intervals. Serum samples were analyzed for the presence of PRRSV and PRRSV-specific antibodies. All challenged pigs became infected with PRRSV, and all unchallenged pigs remained free of infection. No differences (P > 0.10) in ADG, ADFI, or gain:feed (G:F) were observed in PRRSV-challenged compared with unchallenged animals. For PRRSV-challenged animals receiving diets supplemented with Echinacea at 2 or 4%, no differences (P > 0.10) were observed in ADG, ADFI, or G:F ratio. Among PRRSV-challenged pigs, dietary Echinacea did not affect (P > 0.10) the rate or level of the ELISA-detectable antibody response from d 7 to 42 or the level and duration of PRRSV in serum. For PRRSV-unchallenged animals receiving diets supplemented with Echinacea at 2 or 4%, no differences (P > 0.10) were observed in ADG, ADFI, and G:F ratio. Under the conditions of this study, dietary Echinacea did not enhance growth, exhibit antiviral effects to PRRSV, or show any evidence of immune enhancing properties.  相似文献   

4.
日粮烟酸水平对肉鸭后期生产性能和脂肪代谢的影响   总被引：15，自引：0，他引：15  
７２只２１日龄樱桃谷鸭平均分成４组,分别添加０、３０、６０、９０ｍｇ／ｋｇ烟酸进行３周饲养试验。测定平均日采食量（ＡＤＦＩ）、平均日增重（ＡＤＧ）、料重比（Ｆ／Ｇ）、血清总胆固醇（ＴＣＨ）、血清总甘油三酯（ＴＧ）、低密度脂蛋白胆固醇（ＬＤＬ－Ｃ）、高密度脂蛋白胆固醇（ＨＤＬ－Ｃ）。结果表明：①日粮烟酸水平不影响ＡＤＦＩ、ＡＤＧ、Ｆ／Ｇ（Ｐ＞０．０５）,但与ＡＤＦＩ、ＡＤＧ、Ｆ／Ｇ存在显著（Ｐ＜０．０５）或极显著二次曲线关系（Ｐ＜０．０１）。②日粮烟酸水平可能影响ＴＣＨ、ＴＧ、ＬＤＬ－Ｃ、ＨＤＬ－Ｃ,但差异不显著（Ｐ＞０．０５）。当基础日粮烟酸和色氨酸水平分别为３５ｍｇ／ｋｇ和０．１６％时,建议肉鸭后期烟酸添加水平为６０ｍｇ／ｋｇ。  相似文献   

5.
蛋白酶解物对早期断奶仔猪肠黏膜形态和生长性能的影响   总被引：2，自引：0，他引：2  
本文旨在研究自制蛋白酶解物对早期断奶仔猪生长性能的影响。选用40头健康杜×长×大三元杂交商品仔猪(约3.5 kg/头),随机分为5个处理组(1个对照组,4个试验组),每个处理组设4个重复,每重复2头。对照组添加1.5%血浆蛋白粉,试验1~4组分别添加2%玉米蛋白粉酶解物(HCPP)、豆粕酶解物(HSM)、鱼粉酶解物(HFM)和酵母酶解物(HY)。仔猪14日龄断奶,预试期2 d,正试期14 d。试验测定了早期断奶仔猪生长性能和肠黏膜形态。结果表明:日粮中添加2%酵母酶解物通过保护小肠黏膜的正常形态结构,能有效地提高早期断奶仔猪平均日增重(24.64%,P<0.05)和日采食量(7.80%),并改善饲料转化率(13.68%)。  相似文献   

6.
Two 28-d experiments were conducted to evaluate the efficacy of low dietary concentrations of Cu as Cu-proteinate compared with 250 ppm Cu as CuSO4 with growth performance, plasma Cu concentrations, and Cu balance of weanling swine as the criteria. In the production study (Exp. 1), 240 crossbred pigs that averaged 19.8 d of age and 6.31 kg BW initially were group-fed (two or three pigs per pen) the basal diets (Phase 1: d 0 to 14 and Phase 2: d 14 to 28) supplemented with 0 (control), 25, 50, 100, or 200 ppm Cu as Cu-proteinate, or 250 ppm Cu as CuSO4 (as-fed basis). The basal diets contained 16.5 ppm Cu supplied as CuSO4 before supplementation with Cu-proteinate or 250 ppm Cu as CuSO4. There were quadratic responses (P < or = 0.05) in ADFI and ADG for wk 1, Phases 1 and 2, and overall because ADFI was higher for pigs fed 25 or 50 ppm Cu as Cu-proteinate, and ADG increased with increasing Cu-proteinate up to 50 ppm Cu. The Cu-proteinate treatment groups combined had a higher (P < or = 0.05) Phase 2 and overall ADFI and ADG than the CuSO4 group. In the mineral balance study (Exp. 2), 20 crossbred barrows that averaged 35 d of age and 11.2 kg/BW initially were placed in individual metabolism pens with total urine and fecal grab sample collections on d 22 to 26. Treatments were the basal Phase 2 diet supplemented with 0, 50, or 100 ppm Cu as Cu-proteinate, or 250 ppm Cu as CuSO4 (as-fed basis). Treatments did not differ in growth performance criteria. There were linear increases (P < 0.001) in Cu absorption, retention, and excretion (milligrams per day) with increasing Cu-proteinate. Pigs fed 100 ppm Cu as Cu-proteinate absorbed and retained more Cu and excreted less Cu (mg/d, P < or = 0.003) than pigs fed 250 ppm Cu as CuSO4. Plasma Cu concentrations increased linearly (P = 0.06) with increasing Cu-proteinate. In conclusion, weanling pig growth performance was increased by 50 or 100 ppm Cu as Cu-proteinate in our production Exp. 1, but not in our balance Exp. 2, compared with 250 ppm Cu as CuSO4. However, 50 or 100 ppm Cu as Cu-proteinate increased Cu absorption and retention, and decreased Cu excretion 77 and 61%, respectively, compared with 250 ppm Cu as CuSO4.  相似文献   

7.
An experiment was conducted to evaluate the effects of dietary boron (B) on growth performance, bone mechanical properties, and calcium (Ca) and phosphorus (P) metabolism in pigs. Thirty-six barrows were weaned at approximately 21 d of age and randomly assigned to receive one of three dietary treatments. Treatments consisted of 1) low-B basal diet (control), 2) basal + 5 mg B/kg diet, and 3) basal + 15 mg B/kg diet. Boron was supplemented as sodium borate. Barrows remained on their respective experimental diets throughout the nursery (35 d) and growing (30 d) phases of production. Blood samples were obtained from each barrow at the end of each phase. Following the 30-d growing period, eight barrows per treatment were transferred to stainless steel metabolism crates. Barrows had an adjustment period of 7 d, followed by a 7-d total collection of urine and feces. All barrows were fed at 90% of the previous ad libitum grower intake of the control animals during the adjustment and collection periods. At the end of the 7-d collection period, barrows were killed and femurs and fibulas were harvested for the assessment of bone mechanical properties. During the nursery phase, ADG and ADFI were increased (P < 0.05) by B supplementation. Boron did not affect (P = 0.34) feed efficiency during the nursery phase. During the growing phase, ADG and ADFI were increased (P < 0.05) by B supplementation. Boron did not affect (P = 0.97) feed efficiency during the growing phase. Boron did not affect (P = 0.44) bone ash percentage, but B supplementation increased (P < 0.05) bone ash P. Ultimate shear force of the fibula was increased (P < 0.05) in barrows supplemented with 15 mg B/kg diet compared to barrows fed diets supplemented with 5 mg B/kg diet. Apparent absorption and retention of Ca and P were not affected (P > 0.05) by dietary B. These data indicate that B supplementation to pigs can increase growth and bone strength without greatly affecting Ca and P metabolism.  相似文献   

8.
Effect of select menhaden fish meal in starter diets for pigs   总被引：2，自引：0，他引：2  
Two trials were conducted to evaluate a select menhaden fish meal (SMFM) as a protein source in starter diets for 390, 3-wk-old weaned pigs. Initial weights averaged 4.8 and 5.5 kg in Trials 1 and 2, and trials were conducted for 5 and 4 wk, respectively. Diets in Trial 1 were formulated by substituting levels of 0, 4, 8, 12, 16 or 20% SMFM for soybean meal plus corn on a protein basis. The 20% fish meal diet contained no soybean meal; all diets contained between 19.8 and 20.2% CP, between 1.34 and 1.40% lysine and 25% dried whey. Replacement of soy protein with fish meal elicited a quadratic improvement (P = .01) in cumulative ADG and average daily feed intake (ADFI) by the end of wk 5. The diet containing 8% SMFM resulted in the maximum observed ADG; however, the maximum ADFI occurred in pigs fed the diet containing 12% SMFM. Breakpoint analysis indicated that 4.5 and 9.3% SMFM maximized ADG and ADFI, respectively. Addition of SMFM did not affect efficiency of feed utilization (F/G). In Trial 2, a 2 X 3 factorial with two levels of dried whey (10 or 20%) and three levels of SMFM (0, 4 or 8%), a SMFM X dried whey interaction (P less than .05) was observed for cumulative ADG and F/G by the of wk 4 with greater benefit from SMFM with 10% than with 20% dried whey.(ABSTRACT TRUNCATED AT 250 WORDS)  相似文献   

9.
150头仔猪被随机分为5组,每组30头,进行饲养试验,探讨富乐旺对断奶仔猪生产性能和腹泻的影响。试验结果表明:与对照组相比,试验组平均日增重升高其中10mg/kg、15mg/kg和20mg/kg富乐旺添加组差异显著(P<0.05);平均日采食量升高;饲料系数和腹泻率、腹泻频率及死亡率降低。  相似文献   

10.
In each of two experiments, 924 pigs (4.99 kg BW; 16 to 18 d of age) were assigned to 1 of 42 pens based on BW and gender. Pens were allotted randomly to dietary copper (Cu) treatments that consisted of control (10 ppm Cu as cupric sulfate, CuSO4 x 5H2O) and supplemental dietary Cu concentrations of 15, 31, 62, or 125 ppm as cupric citrate (CuCit), or 62 (Exp. 2 only), 125 (Exp. 1 only), or 250 ppm as CuSO4. Live animal performance was determined at the end of the 45-d nursery phase in each experiment. On d 40 of Exp. 2, blood and fecal samples were collected from two randomly selected pigs per pen for evaluation of plasma and fecal Cu concentrations and fecal odor characteristics. In Exp. 1, ADG, ADFI, and G:F were increased (P < 0.05), relative to controls, when pigs were fed diets containing 250 ppm Cu as CuSO4. Pigs fed diets containing 125 ppm Cu as CuCit had increased (P < 0.05) ADG compared with pigs fed diets supplemented with 15 or 62 ppm Cu as CuCit. The ADG, ADFI, and G:F did not differ among pigs fed diets containing 125 and 250 ppm Cu as CuSO4 or 125 ppm Cu as CuCit. In Exp. 2, pigs fed diets containing 250 ppm Cu as CuSO4 had improved (P < 0.05) ADG, ADFI, and G:F compared with controls. In addition, ADG, ADFI, and G:F were similar when pigs were fed diets containing either 250 ppm Cu as CuSO4 or 125 ppm Cu as CuCit. Pigs fed diets containing 62 ppm Cu as CuSO4 or CuCit had similar ADG, ADFI, and G:F. Plasma Cu concentrations were not affected by dietary Cu source or concentration, but fecal Cu concentrations were increased (P < 0.05) as the dietary concentration of Cu increased. Pigs consuming diets supplemented with 125 ppm Cu as CuCit had fecal Cu concentrations that were lower (P < 0.05) than pigs consuming diets supplemented with 250 ppm Cu as CuSO4. Fecal Cu did not differ in pigs receiving diets supplemented with 62 ppm Cu as CuSO4 or CuCit. Odor characteristics of feces were not affected by Cu supplementation or source. These data indicate that 125 and 250 ppm Cu gave similar responses in growth, and that CuCit and CuSO4 were equally effective at stimulating growth and improving G:F in weanling pigs. Fecal Cu excretion was decreased when 125 ppm Cu as CuCit was fed compared with 250 ppm Cu as CuSO4. Therefore, 125 ppm of dietary Cu, regardless of source, may provide an effective environmental alternative to 250 ppm Cu as CuSO4 in weanling pigs.  相似文献   

11.
酵母抽提物替代血浆蛋白粉对断奶仔猪生产性能的影响   总被引：1，自引：0，他引：1  
试验旨在研究酵母抽提物部分或全部替代血浆蛋白粉对断奶仔猪生产性能的影响。试验共选160头体重([6.20±0.10)kg]和日龄([26±2)d]相近的PIC断奶仔猪,分为4个处理,每个处理5个重复,每个重复8头仔猪。对照组(处理1)饲喂基础日粮,处理2饲喂含4%血浆蛋白粉(SDPP)日粮,处理3饲喂含2%SDPP+2%酵母抽提物的日粮,处理4饲喂含4%酵母抽提物日粮。试验期为28 d,所有仔猪自由采食和饮水。结果表明,与对照组相比,饲喂含4%酵母抽提物日粮能促进仔猪生长,试验全期仔猪日增重提高15%(P<0.05),饲料增重比降低7%(P<0.05);与含4%或2%SDPP日粮组相比,饲喂含4%酵母抽提物日粮并没有显著影响仔猪平均日采食量和日增重,但饲料增重比在试验前3周和试验全期均得到显著改善(降低7%～10%,P<0.05)。因此,酵母抽提物能促进断奶仔猪生长,部分或全部替代SDPP不影响仔猪增重,且能改善饲料转化率。  相似文献   

12.
To evaluate a novel feed additive, hops β-acids, a pen trial using 1,440 one-day-old broiler chickens, in a randomized design with 6 treatments and 6 replicates of 40 birds/pen, was conducted. The experimental treatments were a negative control (NC) basal diet, a positive control (PC) basal diet supplemented with zinc 30 mg/kg of bacitracin, and 4 additional treatments consisting of the basal diet supplemented with 30, 60, 120, and 240 mg/kg of hops β-acids in a microencapsulated form. All birds were vaccinated against coccidiosis by eye drops. Productive performance, jejunum morphology, andClostridium spp. count in jejunum and cecum contents were evaluated. At 21 d of age, the birds fed the PC, 30, or 60 mg/kg of β-acids had the same weight gain of those fed the NC, whereas the highest level of β-acids decreased the gain. In addition, feed intake was decreased and FCR was improved in all treatments when compared with the NC. At 42 d, compared with the NC, the treatments containing 30 or 240 mg/kg of β-acids and the PC resulted in improved FCR. No differences were found for other performance variables. No difference was observed among the treatments on villus length, crypt depth, and villus-to-crypt ratio. Except for one sample, all others had negative results forClostridium spp. based on the methodology of sulphite reduction. In this study, we demonstrated positive effects of supplementation of hops β-acids on productive performance of broilers, and the best results were obtained with addition of 30 mg/kg.  相似文献   

13.
Two experiments were conducted to refine the Ile needs in 7- to 11-kg pigs. In Exp. 1, 1,680 pigs were fed a 1.25% digestible Lys diet containing 7.5% spray-dried blood cells (as-fed basis) with supplemental crystalline Ile (0.06% increments) to generate seven levels of apparent digestible Ile (0.47 to 0.83%). There were 12 replicates of each treatment with 20 pigs per pen, and treatments were imposed at an initial BW of 7 kg and continued for 16 d. Responses in ADG, ADFI, G:F, and plasma urea nitrogen (PUN) were quadratic (P < 0.01) over the 16-d period. Data were fitted to both a single-slope broken line and a quadratic fit, and when the quadratic response curve was superimposed on the broken line, the points at which the quadratic curve first intersected the plateau of the broken line occurred at 0.70, 0.73, 0.66, and 0.65% digestible Ile for ADG, ADFI, G:F, and PUN, respectively. Using the ADG and ADFI obtained at this intersection point resulted in an estimate of 9.1 mg of digestible Ile per gram of weight gain. In Exp. 2, 1,840 pigs were fed similarly composed diets, except that digestible Lys was lowered in six diets to 1.10% by decreasing soybean meal. Crystalline Ile was supplemented at 0.09% increments to generate six levels of digestible Ile (0.37 to 0.83%). A seventh diet contained 1.25% digestible Lys by supplementing the 0.83% digestible Ile diet with 0.19% L-Lys HCl to verify that 1.10% digestible Lys was deficient for these pigs. There were 12 replicates of each treatment with 22 pigs per pen, and treatments imposed at an initial BW of 7 kg and continued for 16 d. Supplementation of Lys to the 0.83% digestible Ile diet (1.10 vs. 1.25% digestible Lys) did not affect ADG (260 vs. 264 g/d, P = 0.60) and ADFI (359 vs. 343 g/d, P = 0.20), whereas G:F (725 vs. 774 g/kg, P < 0.01) was improved by increasing dietary Lys. Responses in ADG, ADFI, and G:F to the first six diets were quadratic (P < 0.01) over the 16-d period. The points at which the quadratic curve first intersected the plateau of the broken line occurred at 0.686, 0.638, and 0.684% digestible Ile for ADG, ADFI, and G:F, respectively. Using the ADG and ADFI obtained at this intersection point results in an estimate of 9.9 mg of digestible Ile per gram of weight gain. These results suggest that although the percent digestible Ile requirement and digestible Ile:Lys ratio for starter (7 to 11 kg) pigs may be higher than 1998 NRC recommendations, the requirement may be lower than current recommendations when taking gain and feed intake into account.  相似文献   

14.
Spray-dried animal plasma sourced from bovine, porcine or other animal origin is often used as a main feed ingredient in the diets of weanling piglets to improve growth performance. The objective of this study was to determine the effect of animal plasma in diets on the performance of piglets in the post-weaning period, with and/or without pathogenic challenge, by undertaking a meta-analysis. Data were extracted from peer-reviewed reports published in scientific journals. The average initial weight of the piglets was 5.8 kg and the average initial age 19 days (2–56 days). The average duration of feeding animal plasma was 40 days. Average daily gain (ADG), feed intake (ADFI) and feed conversion ratio (FCR) were found to be 22–28 g/day, 20–27 g/day and −0.28 to 0.06 g/g. Generally, diet supplemented with spray-dried bovine plasma (SDBP) improved the ADG of the piglets and spray-dried porcine plasma (SDPP) led to increases in the ADFI. For the first week post-weaning alone, as the dietary animal plasma percentage increased there was an increase in ADG and ADFI; similarly, the latter two measures increased as weaning age increased. The evidence suggests that mainly IgG present in animal plasma prevents the binding of pathogens to the gut wall and reduces the incidence of sub-clinical infection in the post-weaning stage. Animal plasma containing IgG appears to be a useful in-feed supplement for piglets in the post-weaning phase.  相似文献   

15.
Three experiments were conducted to evaluate spray-dried blood cells (SDBC) and crystalline isoleucine in nursery pigs. In Exp. 1, 120 pigs were used to evaluate 0, 2, 4, and 6% SDBC (as-fed basis) in a sorghum-based diet. There were six replicates of each treatment and five pigs per pen, with treatments imposed at an initial BW of 9.3 kg and continued for 16 d. Increasing SDBC from 0 to 4% had no effect on ADG, ADFI, and G:F. Pigs fed the 6% SDBC diet had decreased ADG (P < 0.01) and G:F (P = 0.06) compared with pigs fed diets containing 0, 2, or 4% SDBC. In Exp. 2, 936 pigs were used to test diets containing 2.5 or 5% SDBC (as-fed basis) vs. two control diets. There were six replicates of each treatment at industry (20 pigs per pen) and university (six pigs per pen) locations. Treatments were imposed at an initial BW of 5.9 and 8.1 kg at the industry and the university locations, respectively, and continued for 16 d. Little effect on pig performance was noted by supplementing 2.5% SDBC, with or without crystalline Ile, in nursery diets. Pigs fed the 5% SDBC diet without crystalline Ile had decreased ADG (P < 0.01), ADFI (P < or = 0.10), and G:F (P < 0.05) compared with pigs fed the control diets. Supplementation of Ile restored ADG, ADFI, and G:F to levels that were not different from that of pigs fed the control diets. In Exp. 3, 1,050 pigs were used to test diets containing 5, 7.5, or 9% SDBC (as-fed basis) vs. a control diet. There were six replicates of each treatment at the industry (20 pigs per pen) location and five replicates at the university (six pigs per pen) locations. Treatments were imposed at an initial BW of 6.3 and 7.0 kg at the industry and university locations, respectively, and continued for 16 d. Supplementation of 5% SDBC without crystalline Ile decreased ADG and G:F (P < 0.01) compared with pigs fed the control diet, but addition of Ile increased ADG (P < 0.01) to a level not different from that of pigs fed the control diet. The decreased ADG, ADFI, and G:F noted in pigs fed the 7.5% SDBC diet was improved by addition of Ile (P < 0.01), such that ADG and ADFI did not differ from those of pigs fed the control diet. Pigs fed diets containing 9.5% SDBC exhibited decreased ADG, ADFI, and G:F (P < 0.01), all of which were improved by Ile addition (P < 0.01); however, ADG (P < 0.05) and G:F (P = 0.09) remained lower than for pigs fed the control diet. These data indicate that SDBC can be supplemented at relatively high levels to nursery diets, provided that Ile requirements are met.  相似文献   

16.
Effect of supplementing wheat dried distillers’ grain with solubles (DDGS)‐containing diet with enzymes on nutrient utilization by growing pigs was evaluated in two experiments. In Experiment 1, 60 pigs weighing ~30 kg were fed five diets that included a corn‐based diet (Control), Control with 10% wheat DDGS (DDGS‐PC), DDGS‐PC without inorganic P source (DDGS‐NC), and DDGS‐NC plus phytase alone or with multi‐carbohydrase for 4 weeks to determine average daily gain (ADG), average daily feed intake (ADFI) and gain‐to‐feed ratio (G:F). In Experiment 2, 30 barrows weighing 22 kg were fed five diets fed in Experiment 1 to determine nutrient digestibility and retention. Pigs fed DDGS‐PC and Control diets had similar ADG and G:F. The ADG and G:F for DDGS‐PC diet were higher (P < 0.05) than those for DDGS‐NC diet. Phytase improved (P < 0.05) ADG, G:F, total tract P digestibility and P retention by 6.6, 8.7, 86.0 and 85.5%, respectively. Addition of multi‐carbohydrase to phytase‐supplemented diet did not affected growth performance, but reduced (P < 0.05) P retention. In conclusion, inclusion of 10% wheat DDGS in growing pig diet may not affect growth performance of growing pigs. Phytase supplementation to wheat DDGS‐containing diet can eliminate the need for inorganic P supplement in pig diets.  相似文献   

17.
本试验旨在研究不同水平百里香酚对伊拉肉兔生长性能、小肠黏膜结构和免疫器官发育的影响。将288只35日龄伊拉断奶肉兔按照公母各半、体重接近原则分为6个处理,每个处理6个重复,每个重复8只兔。对照组饲喂基础饲粮,恩拉霉素组在基础饲粮中添加10 mg/kg恩拉霉素,百里香酚组分别在基础日粮中添加50、100、150、200 mg/kg百里香酚。预试期7 d,正试期42 d。结果表明:与对照组相比,添加100、150、200 mg/kg百里香酚可降低耗料增重比(P<0.05),200 mg/kg百里香酚组采食量低于对照组(P<0.05);与对照组相比,添加50 mg/kg百里香酚提高了十二指肠、空肠和回肠的绒毛高度以及十二指肠、空肠的绒毛高度和隐窝深度比(V/C)值(P<0.05),添加100 mg/kg百里香酚提高了十二指肠和空肠的绒毛高度以及十二指肠、空肠和回肠的V/C值(P<0.05);50 mg/kg百里香酚组脾脏指数高于对照组(P<0.05)。综上所述,在肉兔日粮中添加50~100 mg/kg百里香酚可提高生长性能,改善小肠黏膜形态结构,促进动物肠道发育,增强动物机体免疫力。  相似文献   

18.
试验选用1日龄AA雄性肉仔鸡270只,随机分到5个日粮处理组,进行为期42d的饲养试验。5种日粮是在基础日粮中加入0、50、100、150mg/kg的壳聚糖和50mg/kg的金霉素。结果表明:日粮中添加100mg/kg壳聚糖在提高日增重趋势的同时,提高了饲料转化效率,效果优于金霉素。在血清生化指标方面,100mg/kg壳聚糖组相比对照组降低了血清中TC、TG含量(P<0.05),提高了TPI、GF-1和GH含量(P<0.05),而对葡萄糖和尿酸含量无影响(P>0.05)。初步确定壳聚糖在肉鸡日粮中的适宜添加量为100mg/kg。壳聚糖的促生长作用可能与提高了血清中GH和IGF-1的分泌有关。  相似文献   

19.
本试验旨在研究饲粮中添加不同水平葛根总黄酮对爱拔益加(AA)肉鸡生长性能及肉品质的影响。选择健康1日龄AA肉鸡275羽,随机分为5个组,每组5个重复,每个重复11羽鸡。对照组饲喂基础饲粮,试验组分别在基础饲粮中添加10、50、250、1 250 mg/kg葛根总黄酮。试验期42 d。结果表明:1)10 mg/kg添加组AA肉鸡的平均日增重在8~14日龄、15~21日龄和29~35日龄时均显著高于对照组(P0.05),但在22~28日龄时显著低于对照组(P0.05);250 mg/kg添加组AA肉鸡的平均日增重在8~14日龄时显著高于对照组(P0.05)。10 mg/kg添加组AA肉鸡的料重比在15~21日龄、29~35日龄和36~42日龄时显著低于对照组(P0.05),但在22~28日龄时显著高于对照组(P0.05)。各组AA肉鸡的平均日采食量差异不显著(P0.05)。2)与对照组相比,10 mg/kg添加组AA肉鸡胸肌、腿肌的亮度(L*)值显著降低(P0.05),红度(a*)值有升高趋势但差异不显著(P0.05);250 mg/kg添加组腿肌亮度值显著低于对照组(P0.05);50 mg/kg添加组胸肌、腿肌的黄度(b*)值均显著低于对照组(P0.05)。与对照组相比,250、1 250 mg/kg添加组AA肉鸡的胸肌剪切力显著降低(P0.05);250 mg/kg添加组的胸肌水分含量显著高于对照组(P0.05)。结果表明,饲粮中添加10 mg/kg的葛根总黄酮可提高AA肉鸡的生长性能,但添加250 mg/kg的葛根总黄酮可改善肌肉的色泽和嫩度。  相似文献   

20.
Two experiments were conducted to determine the efficacy of mannan oligosaccharides (MOS) fed at two levels of Cu on growth and feed efficiency of weanling and growing-finishing pigs, as well as the effect on the immunocompetence of weanling pigs. In Exp. 1, 216 barrows (6 kg of BW and 18 d of age) were penned in groups of six (9 pens/treatment). Dietary treatments were arranged as a 2 x 2 factorial consisting of two levels of Cu (basal level or 175 ppm supplemental Cu) with and without MOS (0.2%). Diets were fed from d 0 to 38 after weaning. Blood samples were obtained to determine lymphocyte proliferation in vitro. From d 0 to 10, ADG, ADFI, and gain:feed (G:F) increased when MOS was added to diets containing the basal level of Cu, but decreased when MOS was added to diets containing 175 ppm supplemental Cu (interaction, P < 0.01, P < 0.10, and P < 0.05, respectively). Pigs fed diets containing 175 ppm Cu from d 10 to 24 and d 24 to 38 had greater (P < 0.05) ADG and ADFI than those fed the basal level of Cu regardless of MOS addition. Pigs fed diets containing MOS from d 24 to 38 had greater ADG (P < 0.05) and G:F (P < 0.10) than those fed diets devoid of MOS. Lymphocyte proliferation was not altered by dietary treatment. In Exp. 2, 144 pigs were divided into six pigs/pen (six pens/treatment). Dietary treatments were fed throughout the starter (20 to 32 kg BW), grower (32 to 68 kg BW), and finisher (68 to 106 kg BW) phases. Diets consisted of two levels of Cu (basal level or basal diet + 175 ppm in starter and grower diets and 125 ppm in finisher diets) with and without MOS (0.2% in starter, 0.1% in grower, and 0.05% in finisher). Pigs fed supplemental Cu had greater (P < 0.05) ADG and G:F during the starter and grower phases compared to pigs fed the basal level of Cu. During the finisher phase, ADG increased when pigs were fed MOS in diets containing the basal level of Cu, but decreased when MOS was added to diets supplemented with 125 ppm Cu (interaction, P < 0.05). Results from this study indicate the response of weanling pigs fed MOS in phase 1 varied with level of dietary Cu. However, in phase 2 and phase 3, diets containing either MOS or 175 ppm Cu resulted in improved performance. Pharmacological Cu addition improved gain and efficiency during the starter and grower phases in growing-finishing pigs, while ADG response to the addition of MOS during the finisher phase seems to be dependent upon the level of Cu supplementation.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号