Effect of using okara meal,a by‐product from soymilk production as a dietary protein source for Nile tilapia (Oreochromis niloticus L.) mono‐sex males     

D.M.S.D. EL‐SAIDY 《Aquaculture Nutrition》2011,17(4):380-386

The main objectives of this study was to evaluate the effect of partial and total replacement of fishmeal protein by okara meal (OM) protein in practical diets on growth performance, feed utilization and body composition of Nile tilapia (Oreochromis niloticus L.) mono‐sex males. Fish of an average initial weight of 2.67 ± 0.01 g were stocked in 15 glass aquariums (80 L each) at a rate of 15 fish per aquarium. Fishmeal protein (18% of the diet) was used as the sole source of animal protein in the control diet. Percent replacement of fish meal (FM) by OM on the basis of crude protein was as follows: 0% (control diet A), 25% (diet B), 50% (diet C), 75% (diet D) and 100% (diet E). Diets were fed to fish at a rate of 5%, and then gradually reduced to 4% of the total fish biomass daily, for a period of 12 weeks. The results revealed that the fish fed diets A (100% FM control), B (25% OM), C (50% OM) and D (75% OM) had significantly the best average body weight, weight gain g, specific growth rate (SGR % day^?1), weight gain % and feed intake g fish^?1 compared with diet E (100% OM) which had the lowest values. There were no significant differences (P > 0.05) among all experimental diets and control in terms of feed conversion ratio (FCR), protein efficiency ratio (PER) and survival rate %. Whole body protein contents for fish fed diets B, C and D were superior to the control diet. Incorporation of OM in the diets increased significantly whole body fat content. Incorporation of OM in the diets significantly increased apparent digestibility coefficient of crude protein crude fat and energy. Therefore, these findings suggest that up to 75% of FM protein can be replaced by OM protein in Nile tilapia, mono‐sex male diets.  相似文献   

除草剂对土壤微生物生物量和氮矿化的影响   总被引：5，自引：0，他引：5  

徐建民  黄昌勇 《浙江大学学报(农业与生命科学版)》1999,25(6):639-644

除草剂对土壤微生物生物量和氮矿化有不同的影响效应,这与除草剂类型、除草剂浓度、土壤类型以及包括温度、水分、培养时间等实验条件有关,这些影响效应在土壤肥力和环境保护上的重要性也进行了讨论。  相似文献   

Effects of different sources and levels of dietary chromium supplementation on performance of broiler chicks     

Assem Mohamed Safwat  Asmaa Shawkey Elnaggar  Osama Ahmed Elghalid  Waleed Salah EL‐Tahawy 《Animal Science Journal》2020,91(1)

The current experiment was carried out to evaluate the effect of different dietary chromium supplementation sources, chromium oxide (Cr₂O₃), chromium methionine (Cr‐Met), or chromium yeast (Cr‐yeast), at different levels each (500 or 1,000 ppb) on growth performance, physiological traits, and carcass characteristics of broiler chicks. A total of 490 seven‐day‐old Arbor Acres chicks were randomly distributed into 7 experimental groups each in 10 replicates of 7 birds each. The groups were control, 500 ppb Cr₂O₃, 1,000 ppb Cr₂O₃, 500 ppb Cr‐Met, 1,000 ppb Cr‐Met, 500 ppb Cr‐yeast, and 1,000 ppb Cr‐yeast. The results showed significant superiority of the organic chromium sources (Cr‐Met or Cr‐yeast) concerning body weight and weight gain, the group supplemented with 1,000 ppb Cr‐yeast consumed the lowest feed (3,185 g) and had the best feed conversion ratio (1.60) compared to the control (1.73). The chromium treatments recorded significantly better protein and lipid profile, antioxidant status, and immunological parameters than the control group. Similarly, dietary chromium supplementation increased carcass yield and decreased intestinal pathogenic bacteria. In conclusion, supplementing broiler diets with organic chromium sources at 1,000 ppb promotes growth performance, physiological traits, and carcass characteristics; such chromium treatments enhanced the antioxidant status and immunity levels of broilers.  相似文献   

Factors affecting calving ease in Egyptian buffalo     

Amin M. S. Amin  Mohamed M. I. Salem  Mohamed M. E. Ibrahim  Samy A. Darweish  Ayman G. EL Nagar 《Reproduction in domestic animals》2021,56(2):370-373

Calving ease (CE) is a trait of economic importance that affects animal welfare and farm profitability. The objective of present study was to investigate genetic and environmental factors affecting CE among Primiparous (PP) and multiparous (MP) buffaloes. A total of 9,627 records from 1999 MP and 2,110 PP recorded during the period from 1988 to 2018 were considered. Herd, season of calving, year of calving, birth weight, parity order and gestation length significantly affected CE rate, while age at first calving and sex of calf had no significant effects. Direct and maternal heritabilities of CE in PP and MP were 0.06 and 0.01, respectively. The low heritability of CE indicated that direct selection may not be an effective method to improve CE trait in Egyptian buffalo.  相似文献   

Gas chromatographic determination of incurred dimetridazole residues in swine tissues   总被引：6，自引：0，他引：6  

D R Newkirk  H F Righter  F J Schenck  J L Okrasinski  C J Barnes 《Journal of the Association of Official Analytical Chemists》1990,73(5):702-704

A gas chromatographic method for determination of 2-hydroxymethyl-1-methyl-5-nitroimidazole (DMZOH), the hydroxy metabolite of dimetridazole, in swime muscle has been developed. The method uses cleanup steps similar to those of an earlier polarographic method. The present method is capable of quantitating levels as low as 2 ppb and detecting less than 1 ppb. Recoveries from 30 control tissues spiked at 1, 2, or 4 ppb averaged 80.4%. Performance of the method in incurred tissue was documented and limited data on the depletion of the metabolite in muscle were generated. The muscle of swine given 150 ppm dimetridazole in feed for 14 days contained less than 1 ppb DMZOH at 12 h withdrawal time.  相似文献   

A case of diabetes mellitus in a dog     

NASHED HELMY BASTAWI  EL AYADI MS 《The Veterinary record》1948,60(24):281

  相似文献   

Natural Resources Problems in Japan     

Schenck HG 《Science (New York, N.Y.)》1948,108(2806):367-372

  相似文献   

Amerikanische Analogismen     

C. A. Schenck 《European Journal of Forest Research》1930,52(7-8):262-267

  相似文献   

Identification of New Drinking Water Disinfection by - Products from Ozone, Chlorine Dioxide, Chloramine, and Chlorine     

S. D. Richardson  A. D. Thruston Jr.  T. V. Caughran  P. H. Chen  T. W. Collette  K. M. Schenck  B. W. Lykins Jr.  C. Rav-Acha  V. Glezer 《Water, air, and soil pollution》2000,123(1-4):95-102

Many drinking water treatment plants are currently using alternative disinfectants to treat drinking water, with ozone, chlorine dioxide, and chloramine being the most popular. However, compared to chlorine, which has been much more widely studied, there is little information about the disinfection by-products (DBPs) that these alternative disinfectants produce. Thus, it is not known if the DBPs from alternative disinfectants are safer or more hazardous than those formed by chlorine. To answer this question, we have set out to comprehensively identify DBPs formed by these alternative disinfectants, as well as by chlorine. The results presented here represent a compilation of the last 8 years of our research in identifying new DBPs from ozone, chlorine dioxide, chloramine, and chlorine. We also include results from recent studies of Israel drinking water disinfected with both chlorine dioxide and chloramine. Over 200 DBPs were identified, many of which have never been reported. In comparing by-products formed by the different disinfectants, ozone, chlorine dioxide, and chloramine formed fewer halogenated DBPs than chlorine.  相似文献   

An outbreak of suppurative osteoarthritis of the tibiotarsal joint in rabbits caused by; Pasteurella multocida     

B. E. D. HAGO  O. Y. A/MAGID  S. M. EL SSNOUSI  A. A. GAMEEL†  M. T. ABU-SAMRA‡ 《The Journal of small animal practice》1987,28(8):763-766

An outbreak of suppurative osteoarthritis of the tibiotarsal joint in 25 rabbits in a colony of 50 animals is described. Pasteurella multocida was isolated in pure culture from the affected joints.  相似文献