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1.
For a period of 70 days, young gilts were given rations containing a commercial mixture of polychlorinated biphenyls (PCB), produced in Czechoslovakia (Delor 105). One group of animals (A) was given feed containing 10 mg chlorobiphenyls per kg, the other group (B) was given feed containing 50 mg chlorobiphenyls per kg; on the whole, each animal of group A got 1 g of PCB mixture and each animal of group B 5 g. In about the mid-time of the experiment and before its termination the animals were given an i. m. injection of progesterone; then the animals were studied for the changes in the concentration of blood plasma progesterone. Statistically significant (P less than 0.05) and highly significant (P less than 0.01) differences in the values of the biological half-life of progesterone were found between the group of PCB-treated animals and the control group, and between groups A and B. 相似文献
2.
A randomized blocked factorial experiment was conducted with 90 young pigs. From 4 to 11 weeks of age the pigs were kept in individual pens and fed a selenium supplemented basal diet consisting mostly of propionic acid treated barley, soybean meal and dried skim milk, and containing < 0.5 mg vitamin E per kg. The treatment factors during this period were 3 dietary levels of added vitamin E (nil, 10 and 30 mg/kg) and a 6 % supplement of fresh or oxidized fat (2/3 lard and 1/3 herring oil). From 11 weeks of age until slaughter at 90 kg the pigs received the vitamin E supplements but no fat or dried skim milk. The basal diet for this later experimental period was based on untreated dry barley. Blood samples collected during the period of investigation were examined for vitamin E and for resistance against erythrocyte lipid peroxidation (ELP) in order to evaluate the antioxidant status.Analysis of variance and Student’s t-test on least squares means showed the ELP to be influenced independently by the vitamin E supplement and, during the fat feeding period, by the quality of the fat supplement, with the highest peroxidation resistance (low ELP) in the groups fed fresh fat and a high level of vitamin E. Blood vitamin E level was only influenced — positively — by the vitamin E supplement although variations in the feed vitamin E level below 10–15 mg vitamin E per kg did not result in corresponding variations in measurable blood vitamin E concentrations. In the same low range of vitamin E in the feed there was a statistically significant difference in ELP values between the different vitamin E treatment groups. No clinical manifestations of selenium-vitamin E deficiency were observed in the pigs.The ELP and the plasma vitamin E levels observed would seem to suggest that a total of 15 mg vitamin E per kg barley-based feed will not always be sufficient for growing pigs. 相似文献
3.
In a two-period rearing trial (1st to 24th and 24th to 45th experimental day) using 72 early-weaned piglets, the optimal vitamin-B6 requirement was determined on the basis of different performance criteria and biochemical parameters. In the corresponding live weight ranges of 3.5 to 10 kg and 10 to 21 kg, the animals allotted in 6 groups were ad lib. fed a prestarter and starter feed, respectively containing 0.5, 1.2, 2.0, 2.8, 3.5 and 6.6 mg vitamin B6 per kg dry matter. For adequate feed intake and weight development, a dietary vitamin B6 content of 2.0 mg/kg and 1.2 mg/kg proved necessary for the 1st and 2nd part of the experiment, respectively. An optimal intermediary metabolic situation and thus an optimum vitamin B6 requirement covering, which was derived from the renal xanthurenic acid excretion and the SGOT activity, was attained only at a vitamin B6 supply level of 3.5 and 2.8 mg/kg for the 1st and 2nd experimental periods, respectively. This corresponds to an average vitamin B6 requirement per animal and day of 0.8 mg for the weight range 3.5 to 10 kg, and of 1.9 mg for the weight range 10 to 21 kg. 相似文献
4.
为研究日粮中添加虾青素和维生素B2对蛋鸡生产性能的影响,试验选用45周龄产蛋率和体重相近、健康的海兰褐蛋鸡 600 只,随机分成 5 组,每组 3 个重复,每个重复 40 只鸡。对照组饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组在基础日粮中分别添加0.25 %虾青素＋5.0 mg/kg维生素B2、0.25 %虾青素＋8.0 mg/kg维生素B2、0.25 %虾青素＋11.0 mg/kg维生素B2、0.25 %虾青素＋14.0 mg/kg维生素B2。预试期 7 d,各组均饲喂基础日粮。正试期 28 d,对照组饲喂基础日粮,试验组分别饲喂配方饲料,共35 d。结果表明：（1）试验Ⅱ、Ⅲ、Ⅳ组产蛋率分别较对照组提高2.89%、4.14%、5.01%（P < 0.05）。（2）试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组平均蛋重分别较对照组增加1.69%、2.51%、3.38%、3.93%（P < 0.05）。（3）试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组料蛋比分别较对照组降低2.22%、6.67%、11.85%、12.59%（P < 0.05）。综上,日粮中添加虾青素和维生素B2能提高蛋鸡的生产性能,且添加0.25%的虾青素和14.0 mg/kg维生素B2效果最佳。
[关键词] 虾青素|维生素B2|蛋鸡|生产性能 相似文献
5.
A study was conducted on 20 "Rahmani" male lambs of 16 kg body weight fed on normal feed level and high vitamin A level (NF-HV); normal feed level and normal vitamin A level (NF-NV); low feed level and high vitamin A level (LF-HV) or low feed level and normal vitamin A level (LF-NV) till slaughter weight of 35-40 kg. Average daily gains of lambs were 211, 148, 117 and 87 g for the NF-HV, NF-NV, LF-HV and LF-NV groups, respectively. The corresponding feed conversions were 4.3, 5.9, 5.0 and 6.4 kg DM/kg gain. Raising feed intake and vitamin A level enhanced nutrients digestibility and nitrogen balance. Rumen liquor reflected higher pH value in animals fed higher intake (NF) in the first two diets. Both feed intake and vitamin A levels enhanced volatile fatty acids and ammonia concentrations in the rumen liquor. Feed intake and vitamin A levels positively affected haemoglobin content, packed cell volume, glucose, urea, total protein, vitamin A, insulin, cholesterol, phospholipids, glutamate oxaloacetate and glutamate pyruvate transaminases and alkaline phosphatase in blood Vitamin A, insulin, cholesterol and phospholipids in blood increased gradually over the experimental period. Dressing percentages were 56.2, 49.6, 49.1 and 44.6% for the experimental groups, respectively. Liver content of glycogen and vitamin A increased with increasing feed intake and vitamin A levels. It is concluded that higher levels of vitamin A supplementation (than usually recommended) is required during fattening of lambs. Low energy and normal vitamin A levels are not recommended in lambs feeding. 相似文献
6.
以玉米淀粉和低锌豆粕为主要原料构成含锌4．67mg／kg的半纯合低锌基础日粮，将150只1日龄艾维茵肉仔鸡随机分为3个自由采食组与2个限制采食组。其中．自由采食组日粮是在低锌基础日粮中分别添加0、5、80mg／kg的锌，各组的VA添加水平均为3000 IU／kg日粮。2个限制采食组的日粮锌添加水平为80mg／kg，其它营养成分及采食量控制到与相应的低锌组一致的水平。结果表明，日粮锌水平低于9．67mg／kg时，可引起肉仔鸡血清VA浓度的明显下降。日粮锌含量为4．67mg／kg时，血清VA浓度的下降既与缺锌本身有关，又与因缺锌继发的采食量下降有关；日粮锌含量为9．67mg／kg时，血清VA浓度的下降主要是由缺锌继发的采食量下降引起的。限制采食也可引起肉仔鸡血清VA浓度的下降，但对血清锌浓摩无明显的影响。 相似文献
7.
Effects of supplemental vitamin E during the laying period on the reproductive performance of Taiwan native chickens 总被引：1，自引：0，他引：1
1. One-day-old Taiwan Native Breeder female chicks were fed on maize/soybean growing diets without supplemental vitamin E from hatch to 17 weeks of age. After 17 weeks the birds (n = 300) were randomly assigned to 5 dietary treatments and fed on maize/soybean laying diets supplemented with 0, 40, 80, 120 and 160 mg/kg of vitamin E (dl-alpha-tocopherol acetate), respectively, until 46 weeks of age. The variates measured included: age at first egg, feed consumption (FC), feed efficiency (FE), egg production (EP), egg weight (EW), egg specific gravity (ESG), eggshell strength (ESS), fertility and hatchability. 2. The addition of 120mg/kg of vitamin E lowered the first EW (P<0.05); however, there was no significant difference in the age or body weight (BW) of pullets at first egg or mortality rate to 46 weeks of age among the treatments. FE and egg mass were improved (P<0.05) in pullets fed 80 mg/kg of supplemental vitamin E. A significant increase in EP was observed after peak EP in pullets given 80 mg/kg of supplemental vitamin E. However, this favourable effect decreased as supplemental vitamin E exceeded 80 mg/kg. 3. From 17 to 46 weeks of age, egg quality (ESG and ESS) decreased with age. However, there was no correlation between age and fertility or hatchability during the experimental period, suggesting that egg quality is more age-sensitive than reproductive performance for breeder pullets. 4. Compared with the control, fertility and hatchability of all eggs set for the treatment with 80 mg/kg supplemental vitamin E increased by 7.7 and 13.4%, respectively. There was no difference in the hatchability of fertile eggs. 5. These results suggest that using supplemental vitamin E during the laying period can improve the reproductive performance of breeder pullets. The addition of 80 mg/kg of vitamin E obtained the best performance in EP, egg mass, FE (feed/egg), hatchability and fertility. 相似文献
8.
This study was conducted to evaluate the effects of dietary vitamin K (menadione) on bone quality in cage-raised broilers. Three hundred and sixty male broilers were randomly allotted to one of six treatments, with six replicate pens per treatment and 10 chicks per pen. Broilers were fed one of six diets including a control diet or the control diet plus graded levels of vitamin K (0.5 mg/kg, 2 mg/kg, 8 mg/kg, 32 mg/kg and 128 mg/kg). Water and feed were provided ad libitum during the 7-week experimental period. Results indicated that vitamin K supplementation of broilers diets significantly effected bone quality and feed efficiency. The treatment containing vitamin K at 8 mg/kg improved growth performance (during weeks 6-7) and bone quality (during weeks 0-3). In our study, hydroxyapatite binding capacity of serum osteocalcin (during weeks 0-3), bone breaking strength, bone flexibility, bone ash weight increased linearly (P < 0.05) and bone mineral density, bone mineral content increased quadratically (P < 0.05) with increasing supplementation of vitamin K. In conclusion, to gain optimum bone quality and broiler performance, our studies suggest that the concentration of vitamin K in broilers diets should be 8 mg/kg, 2 mg/kg, and 2 mg/kg, for the starter, grower and finisher phases, respectively. Furthermore, it was shown that the starter period is an important phase for improving bone quality. In addition, this study validated the mechanism of vitamin K effects on bone quality. Vitamin K boosts the carboxylation of osteocalcin and decreases the concentration of serum under-carboxylated osteocalcin enhancing hydroxyapatite binding capacity of serum osteocalcin and improving bone quality. 相似文献
9.
本试验旨在研究饲粮中添加不同微生态制剂对樱桃谷肉鸭生长性能、屠宰性能及免疫器官发育的影响.选取320羽10日龄樱桃谷肉鸭,随机分为4组,1个对照组和3个试验组,每组4个重复,每个重复20羽.对照组饲喂基础饲粮,3个试验组分别饲喂在基础饲粮的基础上添加50 mg/kg芽孢杆菌混合物(试验Ⅰ组)、1000mg/kg芽孢杆菌与寡糖混合物(试验Ⅱ组)、1 000 mg/kg芽孢杆菌与链球菌混合物(试验Ⅲ组)的试验饲粮.试验期33 d.结果表明:试验Ⅱ组和试验Ⅲ组的平均日增重显著或极显著高于对照组(P＜0.05或P＜0.01).试验Ⅲ组的平均日采食量、料重比显著低于试验Ⅰ组和对照组(P＜0.05).各试验组的存活率显著或极显著高于对照组(P ＜0.05或P＜0.01).与对照组相比,试验Ⅲ组的腹脂率显著下降(P＜0.05),法氏囊指数显著升高(P＜0.05).由此得出,饲粮中添加芽孢杆菌与寡糖混合物和芽孢杆菌与链球菌混合物均能提高樱桃谷肉鸭的生长性能;此外,饲粮中添加芽孢杆菌与链球菌混合物还可提高樱桃谷肉鸭的胴体品质和免疫机能. 相似文献
10.
1. Three hundred and eighty 1-day-old Arbor Acres broilers were divided into control (A) and experimental (B, C, D, and E) groups. 2. After 14 d of age the experimental groups were subjected to a cool temperature challenge by lowering the temperature 1 to 2°C per day down to 12°C, and maintaining this temperature until 7 weeks of age. 3. At the same time, l.5 mg/kg 3,3,5-triiodothyronine (T 3 ) was added to the diet of groups D and E, and 500mg/kg ascorbic acid (vitamin C) to the diet of groups C and E. 4. The incidence of pulmonary hypertension syndrome (PHS), body weight gain and feed intake were measured weekly. Lung and blood samples were collected weekly from 10 birds per group beginning on d 14, and the percentage of thick-walled peripheral lung vessels (%TWPV) and packed cell volume (PCV) were determined. 5. The lower ambient temperature and diets supplemented with T 3 increased PHS incidence and % TWPV and decreased body weight gain. 6. There was an increase in PCV after 5 weeks of age under lower ambient temperature 3 and the PCV values 14 were also significantly increased by T 3 . 7. Vitamin C supplementation reduced PHS incidence and % TWPV but did not change packed cell volume, body, weight gain, feed intake, or feed conversion. 8. It is concluded that vitamin C reduced PHS and the associated muscularisation of pulmonary arterioles induced by exposing broilers to cool environmental temperatures and feeding them with T 3 . 相似文献
11.
In six experiments with laying hybrids the influence of a varied nutritive beta-carotene and vitamin A supply during rearing on the performance in the laying period was tested. Basal rations poor in carotene without vitamin A supplementation in the rearing period diminished feed intake and laying performance in the laying period, retarded the beginning of intensive laying and increased feed expenditure per 100 g egg if the feed for laying hens contained less than 5000 IU vitamin A per kg. Relations between varied vitamin A supply and the performance parameters of the laying performance could not be proved if chick and young hen feed with maize even without vitamin A supplement or if rearing feed with approximately 2500 IU vitamin A or laying hen feed greater than 5000 IU vitamin A supply were used. 相似文献
12.
432只产蛋率为49.5%的60周龄的海兰褐商品蛋鸡随机分为3个组。开食时,A组(对照组)给予低维生素日粮(VA 3000IU/kg,VE10IU/kg,VD 300IU/kg,VC 20mg/kg,VK4mg/kg,多维20mg/kg);B组给予中等维生素日粮(5倍对照);C组给予高维生素日粮(10倍对照)。结果表明,与A组相比,B组、C组达50%产蛋率的试验天数显著(p<0.05)减少;换羽期产蛋率、产蛋量极显著(p<0.01)提高,料蛋比、死亡率和破软蛋率极显著(p<0.01)降低;C组换羽后破软蛋率、换羽后死亡率分别显著(p<0.05)和极显著(p<0.01)降低,且换羽后效益最好,比对照组提高18.13%。 相似文献
13.
试验旨在探究虾青素和维生素B2在日粮中的添加量对鸡蛋品质的影响。选择1200只体重相近、健康的45周龄海兰褐蛋鸡,随机分成5组,每组4个重复,每个重复60只鸡。对照组蛋鸡饲喂基础日粮,试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组蛋鸡饲喂固定比例的基础日粮和0.25%虾青素,混合不同含量的维生素B2(5.0、8.0、11.0、14.0 mg/kg)。预试期1周和正式试验期4周,预试期各组蛋鸡均饲喂基础日粮,正式试验期分别投放上面试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组的配比的饲料。结果表明,试验组蛋黄颜色、哈夫单位均显著高于对照组(P<0.05)。试验Ⅱ、Ⅲ、Ⅳ组鸡蛋粗脂肪含量显著低于对照组(P<0.05)。试验组鸡蛋平均蛋重、蛋壳厚度、蛋壳强度、蛋比重与对照组相比有增大的趋势。试验表明,日粮添加虾青素和维生素B2能提高蛋品质,添加0.25%虾青素和14.0 mg/kg维生素B2效果最好。 相似文献
14.
In two experiments with 420 male cairina (Cairina moschata domestica L.) semisynthetic rations were used with vitamin A supplements between 0 and 10,000IU per kg feed. Clinical deficiency symptoms, such as coordination disturbances or horny growths at the oesophagus glands, could be prevented in the starter period up to 3rd week with 500IU vitamin A and in the fattening period between the 4th and 10th/11th weeks with a 250IU vitamin A supplement per kg feed. Cairina achieved an optimal fattening performance under the conditions tested with 1,000 IU in the starter period and with 500 IU vitamin A supplement in the fattening period. Under consideration of the vitamin A storage in the liver and a safety supplement of 4000 IU vitamin A per kg start feed (0-3 weeks) and 2,000 IU vitamin A per kg fattening feed (4-11 weeks) is suggested as requirement norm and mixed feed supplement. 相似文献
15.
Influence of dietary rapeseed oil, vitamin E, and copper on the performance and the antioxidative and oxidative status of pigs. 总被引：15，自引：0，他引：15
We investigated the effects of dietary copper and vitamin E in diets containing 6% rapeseed oil on the performance and the antioxidative and oxidative status of growing pigs. The 10 dietary treatments consisted of a basal diet (9 mg of vitamin E/kg feed, 15 mg of Cu/kg feed), the basal diet + 6% rapeseed oil (Diet 1; 18 mg of vitamin E/kg feed, 15 mg of Cu/kg feed), and Diet 1 plus supplements of vitamin E (0, 100, and 200 mg of dl-alpha-tocopheryl acetate/kg feed) and copper (0, 35, and 175 mg of Cu/ kg feed) in a 3 x 3 factorial arrangement of treatments. Eight or nine pigs were given ad libitum access to each diet from 25 to 100 kg of live weight. The inclusion of rapeseed oil tended (P < .10) to improve ADG and feed utilization. Compared with the addition of 35 mg of Cu/kg, the addition of 175 mg/kg improved growth rate and increased feed intake early in the experiment, but, over the total experiment, neither 35 nor 175 mg of Cu/kg affected performance. Compared with the addition of 100 mg of vitamin E/kg or no addition, the addition of 200 mg/kg reduced ADG over the total experiment (P = .05). The antioxidative and oxidative status of the pigs was evaluated in terms of blood and liver concentrations of antioxidants (alpha-tocopherol, ascorbic acid, vitamin A, superoxide dismutase, glutathione peroxidase), prooxidants (Cu), concentrations of lipids (triglycerides and cholesterol), fatty acid composition, thiobarbituric acid-reactive substances (TBARS), and clinical chemical (creatine kinase and glutamate-oxaloacetate-transaminase) and hematological variables that indicate the level of oxidative stress. There were no vitamin E deficiency signs or increased oxidative stress in pigs fed low dietary vitamin E levels, and no prooxidative effect of Cu was found. Increasing dietary levels of vitamin E increased the concentration of alpha-tocopherol in plasma and liver. Supplementation with Cu increased liver concentrations of Cu and alphatocopherol. The progression in liver TBARS was reduced by the addition of vitamin E and Cu. The addition of rapeseed oil changed the fatty acid composition of liver, increased alpha-tocopherol concentration in plasma and Cu concentration in liver, and reduced the rate of lipid oxidation in liver. In conclusion, even though the effects were minor, vitamin E, Cu, and rapeseed oil improved the antioxidative status of the live pigs. 相似文献
16.
饲料中维生素A水平对凡纳滨对虾生长、饲料利用、体组成成分及非特异性免疫反应的影响 总被引：1，自引：0，他引：1
本文旨在研究5种等氮等能饲料中,维生素A添加水平对凡纳滨对虾(Penaeus vannameiBoone)生长、饲料利用、体组成成分及非特异性免疫反应的影响。试验选用平均初始体重为(0.069±0.005)g的凡纳滨对虾450尾,随机分为5个处理组,每组90尾,每组设3个重复,每个重复30尾。试验采用单因素设计,以维生素A醋酸酯为维生素A源,用添加不同水平维生素A(添加量分别为0、18、365、4和72 mg/kg)的饲料喂养凡纳滨对虾,试验期11周。结果表明:在养殖前4周,饲料中添加维生素A显著促进凡纳滨对虾的生长(P<0.05),提高其对饲料利用效率(P<0.05),而对对虾的成活率不产生显著的影响(P>0.05);第11周的结果表明,饲料中添加维生素A并不能显著影响凡纳滨对虾的生长、饲料利用效率和成活率(P>0.05)。维生素A对对虾体脂肪、蛋白质含量的影响显著(P<0.05),对对虾体水分和灰分含量无显著影响(P>0.05)。维生素A对对虾血清中溶菌酶活力、酚氧化酶活力和血液红细胞数量的影响显著(P<0.05),饲料中未添加维生素A或过量添加(超过36 mg/kg)均导致血清中溶菌酶活力、酚氧化酶活力和血细胞总数显著下降(P<0.0 5),而对血清超氧化物歧化酶活力无显著影响(P>0.0 5)。用折线回归模型分析饲料维生素A添加量与对虾增重率的变化关系,表明在试验前4周,凡纳滨对虾饲料中维生素A的适宜添加量为2 2.5 0 mg/kg;1 1周试验期间,凡纳滨对虾饲料中维生素A适宜添加量为1 8 mg/kg;以溶菌酶、酚氧化酶活力为指标,凡纳滨对虾饲料中维生素A最适添加量为5 9.5 1 mg/kg。 相似文献
17.
Five trials involving 71 piglets and young porkers were conducted to test the toxic action of polychlorinated biphenyls (PCB) added to the complete feed mixtures as Delor 103, 105 or 106 (manufactured by Chemko Strázske) administered to the experimental groups. The intake of these biphenyls for 14 or 21 days at rates from 100 to 250 mg per kg of feed had no adverse effect on the health condition, production parameters and concentration of total protein, albumin, globulin, urea, glucose and cholesterol in blood serum. Delor 105 had the highest biological effectiveness: its intake increased the relative weight of liver, reduced the serum level of thyroid hormones and corticosteroids. When the weaned piglets consumed a starter feed with an addition of 1 mg of Delor 105 per kg (corresponding to a high natural PCB contamination) for 26 days, no adverse effect was recorded and, on the contrary, the growth of the animals was stimulated and their feed utilization was better. The results suggest that the young pigs are comparatively resistant to the toxic action of PCB. 相似文献
18.
Debski B Gralak MA Gronowska-Senger A Gornicka M 《Polish journal of veterinary sciences》2011,14(4):629-634
Male young growing rats of Wistar strain (n = 54) were fed a vitamin E deficient diet for 3 days of adaptation period and then 10 days of experimental period. After adaptation half of the rats ran, once per a day, on a treadmill with a rate of 2.0 m/s for 15 minutes for the following 10 days. Animals were given orally 0, 0.5, 1.0 or 4.0 mg/d/rat of alpha-tocopherol. The aim of the study was to evaluate the influence of physical training on tocopherol and insulin concentrations in the blood plasma of rats treated with different doses of vitamin E. The concentrations of alpha-tocopherol (HPLC-UV method used) and insulin (rat insulin specific RIA method used) were estimated in the blood plasma. Lower concentration of vitamin E in physically trained animals was observed, which may suggest increased needs of organisms for antioxidants, as a result of increased free radical production. In trained rats a lower concentration of plasma insulin was also observed. This effect is probably related to improvement in insulin action observed in organisms under physical exercise. The most significant impact on plasma alpha-tocopherol was due to its supplementation level. The treatment of rats with different doses of alpha-tocopherol was found to be not related to insulin concentration in plasma. A significant increase in feed conversion factor was noted in vitamin E treated animals. The obtained results suggest that the increased requirement of trained rats for antioxidants might be covered by alpha-tocopherol supplementation. 相似文献
19.
试验选用1日龄正大艾维茵肉鸡480只,随机分成4个处理组,每个处理6个重复,每个重复20只鸡(公母各半)。参照肉鸡饲养标准,按照1～3周龄、4～5周龄和6周龄阶段配置基础饲粮。处理1饲喂基础日粮(对照组),处理2在基础日粮的基础上添加69mg/t的25-羟基维生素D_3,处理3在基础日粮的基础上添加750U/kg的复合酶制剂,处理4在基础日粮的基础上同时添加69mg/t的25-羟基维生素D_3和750U/kg的复合酶制剂。试验结果表明:①单独添加复合酶制剂,降低了4～5周龄时的日采食量和6周龄时的料重比(P>0.05);在其他方面与对照组相比差异均不显著(P>0.05)。②单独添加25-羟基维生素D_3,在生产性能、屠宰指标方面虽然有部分高于对照组,但差异均不显著(P>0.05)。③同时添加69mg/t的25-羟基维生素D_3和750U/kg的复合酶制剂,生产性能方面与对照组相比差异均不显著,但表现出提高的趋势(P>0.05);屠宰性能方面,使屠宰率和腹脂率显著降低(P<0.05),但使全净膛率显著提高(P<0.05)。 相似文献
20.
To evaluate the effect of ionizing radiation on sensory changes of feeds in relation to their utilization by dogs, four groups of experimental animals were formed. Two groups were fed a ration where the main component (meat feed mixture VETACAN and loose feed mixture VETAVIT) was irradiated by radioisotope Co 60 at the dose of 25 kGy/kg for the period of 90 days. In the remaining two groups a non-irradiated ration was used for the same period. For both diets, control groups of dogs were formed and the feed ration was biologically fortified by a vitamin-mineral supplement to the physiological standard. It followed from the observations that the effect of radiation caused a significant qualitative decrease in the level of energy nutrients, particularly in the protein and lipid sphere. It is assumed that the extent of damage of lipid fraction is also accompanied by deficient vitamin activity and further by significant changes of taste and aromatic properties felt by animals. Irradiation of the feed ration caused a significant 20 to 25% decrease of food intake with a subsequent decrease of live weight and deterioration of physical condition. Irradiated diets without biological fortification caused significant losses of weight from the initial value mean = 39.5 kg to mean = 35.33 kg, in comparison with the non-irradiated rations through which the live weight was stabilized, and at biological fortification positively influenced. Irradiation of the feed ration during the period of study had not caused a response of the organism displayed in changes of physiological values of body temperature and heart and respiration rates in experimental animals. Radiosterilization of feeds had not caused any significant decrease of training ability and performance of dogs. 相似文献