scholarly journals Peculiarities of fish phosphorus balance at a high Cu2+ content in water

2019 ◽  
Vol 77 (1) ◽  
pp. 75-79
Author(s):  
V. Gandziura ◽  
N. Korevo
Keyword(s):  
Feed Efficiency ◽  
Aquatic Environment ◽  
Sharp Increase ◽  
Copper Content ◽  
Phosphorus Content ◽  
The Body ◽  
Trophic Groups ◽  
Trophic Conditions ◽  
Phosphorus Balance ◽  
Phosphorus Excretion

The essential infringements of fish phosphorus balance at elevated concentrations of Cu2+ in water was established – a sharp increase of intensity of phosphorus excretion, which ultimately leads to a significant decrease in its content in the body of fish. The peculiarities of the phosphorus balance of fish of various trophic groups: zooplankton phage, benthophages and ichthyophages have been established. It was found out how trophic conditions effect on the components of the phosphorus balance. It was found out how trophic conditions affect the components of the phosphorus balance. Bentofages and zooplankton- phages at the conditions of higher copper content have more pronounced disorders the phosphorus balance then ichthyophage-predators at the same time, even with an increase in the intensity of phosphorus excretion due to the increased copper content in the aquatic environment, was noted by minimal changes in its content in the body, due to the chemical composition of the food of these trophic groups. It was shown that when the content of Cu2+ in water is 10 µg / l of feed use with a high phosphorus content (3.0 %), it can compensate for its loss due to increased excretion, normalize its natural content in the body and increase the growth rate of fish and their feed efficiency. It is proposed to use the intensity of phosphorus excretion for the diagnosis of toxic pollution of the aquatic environment by heavy metals. At the same time, fish of various trophic groups should be used, with the exception of predators

scholarly journals ISOLATION OF PURIFIED COPPER PROTEIN FROM HORSE LIVER

1954 ◽  
Vol 37 (4) ◽  
pp. 433-439 ◽  
Author(s):  
Mostafa S. Mohamed ◽  
David M. Greenberg
Keyword(s):  
Copper Content ◽  
Catalytic Properties ◽  
Copper Acetate ◽  
The Body ◽  
Pure Form ◽  
Acetate Solution ◽  
Copper Protein ◽  
Green Color ◽  
Horse Liver

1. A procedure is described for isolating a copper protein from horse liver in pure form, in a state that appears to be crystalline. 2. This copper protein is colored blue-green, and its copper content varied between 0.3 and 0.4 per cent. No indication of any catalytic properties was obtained in the limited number of tests made. Because of its variable copper content, the protein may function for the storage of copper in the body. 3. The copper could be removed partly from the protein by dialysis against cyanide, and a colorless crystalline protein was obtained by lowering the pH to 5.0, followed by dialysis. The original blue-green color of the protein could be restored by dialysis against copper acetate solution.

scholarly journals Hatchability, Growth Performance, Feed Efficiency, and Survival of Normal Feathered Local, Sasso-rir and Their F1-cross Chickens Under on-station Management Condition in Southern Ethiopia

2021 ◽  
Author(s):  
shewangizaw woltamo wolde ◽  
Tadele Mirkena ◽  
Aberra Melesse ◽  
Tadelle Dessie ◽  
Solomon Abegaz
Keyword(s):  
Body Weight ◽  
Survival Rate ◽  
Growth Performance ◽  
Feed Efficiency ◽  
Body Weight Gain ◽  
The Body ◽  
Southern Ethiopia ◽  
Feed Conversion ◽  
Egg Hatchability ◽  
F1 Cross

Abstract The Normal Feathered local chicken (LL), Sasso-RIR (SRSR) and their F1-cross (LSR) chickens were hatched to evaluated for egg hatchability, growth performance, feed efficiency and survival rate. After 14-days of brooding, 150 chicks of each genotype were randomly selected and further replicated in to five pens in a deep litter grower house consisting of 30 chicks each in a completely randomized design, and evaluated for a period of 16-weeks. Hatchability of fertile eggs was highest for LL (80.0 %), intermediate for LSR (68.6%) and lowest for SRSR (55.9%) chickens. The body weight (BW) of chicks at 2-weeks of age was 80.0, 76.3 and 61.5 g/bird for SRSR, LSR, and LL, respectively, the latter being the lowest (p<0.05). The respective BW at 8-weeks of age was 732, 587 and 451 g while at 18-weeks it was 1877, 1379 and 1070 g/bird and different from each other (p<0.05). During 3- to 8-weeks and 9- to 18-weeks growth periods, the LL chickens were inferior (p< 0.05) in feed intake (29.7 and 66.9 g/d/bird) whereas the SRSR chickens were superior (p< 0.05) in body weight gain (15.5 and 16.3 g/d/bird) and feed conversion ratio (2.67 and 5.35 g feed/ g gain), respectively. The mortality rate of chicken was not affected by genotypes. It can be concluded that the exotic blood of Sasso-RIR chicken had played a significant role in upgrading the growth rate and market weight of the local Normal Feathered chicken without adverse effect on hatchability, feed efficiency, and survival rate.

Establishing the limits of the permissible content of chemical elements in the wool of representatives of the family Hamster Cricetidae using centile scales

2020 ◽  
Vol 1 (9) ◽  
pp. 72-77
Author(s):  
M. V. Stepanova ◽  
◽  
V. A. Ostapenko ◽  
Keyword(s):  
Heavy Metals ◽  
Copper Content ◽  
Chemical Elements ◽  
Federal District ◽  
The Body ◽  
Average Content ◽  
Absorption Method ◽  
Opposite Trend ◽  
The Family ◽  
Heavy Metals And Arsenic

The aim of the study was to study the content of some heavy metals and arsenic in members of the Cricetidae family of hamsters and to develop centile scales for assessing the level of accumulation of these elements for the Central Federal District. In 2018–2020, hamster`s wool was studied for the accumulation of zinc, copper, iron, lead, cadmium and arsenic by the atomic absorption method. The data on the characteristics of the content of chemical elements in different sexes of animals are given. In the course of the study, it was found that, according to the value of the average content in the wool of animals of the family, the studied elements form the following decreasing series: Fe> Zn> Pb> Cu> Cd> As. When studying the features of the accumulation of chemical elements by different sexes, a significant increase in the concentration of zinc, iron, cadmium and arsenic in the wool of males was established, compared with females, depending on the species, from 1,38 to 3,98; from 1,28 to 1,52; from 2,00 to 304,00 times, respectively. With regard to the accumulation of copper in the body, the opposite trend is observed. In females, its concentration is 1,5–3,19 times higher. In the studied sample of animals, an increase in copper content was revealed in 44,83% of individuals and a decrease in cadmium in 44,82%.

scholarly journals Effect of water medium upon the process of ore disintegration in wet self-grinding mills

2019 ◽  
Vol 109 ◽  
pp. 00058
Author(s):  
Vitalii Monastyrskyi ◽  
Serhii Monastyrskyi ◽  
Borys Mostovyi
Keyword(s):  
Aquatic Environment ◽  
Experimental Studies ◽  
The Body ◽  
Angle Of Repose ◽  
Hydrodynamic Resistance ◽  
Uniform Structure ◽  
Water Medium ◽  
Large Piece ◽  
Grinding Mills ◽  
Expansion Force

This article presents the results of theoretical and experimental studies on the processes of destruction ore in wet self-grinding mills under the influence of the aquatic environment on it. The equivalent circuit for determining the stress-strain state of a large piece (ball) exposed to the load at an angle of repose of the material in motion are justified. A uniformly distributed pressure acts on the body of arbitrary shape, depending on the hydrostatic pressure of the pulp inside the drum and the force of hydrodynamic resistance). It is assumed that a large piece has the shape of a sphere with a uniform structure, but in some of its parts there are cavities filled with an incompressible fluid. Under the action of these forces inside the cavity wedging effects of water occur, the effect of which on the strength ores depends on the expansion force and the angle of the micro crack. The experimental researches are done under laboratory and industrial conditions. It was established that the disintegration of kimberlitic ore in MMC is significantly influenced by the characteristics of the aquatic environment pH and Eh, the values of which vary from 3.2 to 7.0 and from -500 to +1020 mV.

Studies on reflexion of light from silvery surfaces of fishes, with special reference to the bleak, Alburnus alburnus

1965 ◽  
Vol 45 (3) ◽  
pp. 683-703 ◽  
Author(s):  
E. J. Denton ◽  
J. A. C. Nicol
Keyword(s):  
Special Reference ◽  
Aquatic Environment ◽  
The Body ◽  
Natural Light ◽  
Light Conditions ◽  
Trachurus Trachurus ◽  
Reflecting Surfaces ◽  
Bleak Alburnus Alburnus ◽  
Different Parts

The problem of how a fish can make itself invisible in the natural light-conditions in an aquatic environment is discussed with particular reference to the silvery surfaces of fish.In fish which we have examined, the silvery surfaces are of two types: (1) an argenteum which consists of long thin crystals of guanine whose reflecting surfaces are approximately parallel with the surface of the fish; (2) layers of guanine crystals lying either on the inner surfaces of the scales or in the subdermis—these crystals are not, in general, orientated with their reflecting surfaces parallel with the surfaces of the fish, and are much broader than those of the argenteum.Methods are described by which the orientation of the crystal planes with respect to the planes of the scales on which they lie can be determined.The orientation of the crystals of type 2 in different parts of the body is described for the horse mackerel, Trachurus trachurus (L.), and for the bleak, Alburnus alburnus (L.).For the bleak it is shown that although the planes of the crystals are often very much inclined with respect to the planes of the scales, the long axes of the crystals are always approximately parallel with the planes of scales. The inclination of the crystals, therefore, is away from the scales across their short axes.Measurements of the light transmitted by silvery scales of the bleak show that they reflect light strongly when this falls obliquely on the crystals which they contain and that they are most transparent to light which strikes the scales in a direction perpendicular to the reflecting planes of the crystals.

scholarly journals THE EFFECT OF DL-METHIONINE SUPPLEMENTATION ON BODY WEIGHT GAIN, FEED CONSUMPTION AND FEED EFFICIENCY OF BROILERS

2020 ◽  
Vol 2 (2) ◽  
pp. 37-44
Author(s):  
Deddyano Kandido Son ◽  
Charles Venirius Lisnahan ◽  
Oktovianus Rafael Nahak
Keyword(s):  
Body Weight ◽  
Weight Gain ◽  
Feed Efficiency ◽  
Body Weight Gain ◽  
Animal Husbandry ◽  
The Body ◽  
Feed Consumption ◽  
Study Program ◽  
Randomized Design ◽  
Methionine Supplementation

The purpose of this experiment was to know the effect of dl-methionine supplementation in feed on the body weight gain, feed consumption, and feed efficiency of broilers. The experiment was conducted at the Laboratory of Animal Husbandry Study Program, Agricultural Faculty, University of Timor, Kefamenanu from December 2019 to January 2020. The experiment used 80 fourteen-day broilers. The method used in this research was an experimental method with a completely randomized design (CRD) consisting of 4 treatments and 4 replications. The treatments given were: T0 (control feed), T1 (T0 + 0.30% dl-methionine), T2 (T0 + 0.50% dl-methionine), and T3 (T0 + 0.70% dl-methionine). The variables observed were body weight gain, feed consumption, and feed efficiency. The results of the experiment showed that the treatment significantly affected the body weight gain, feed consumption, and feed efficiency of broilers (P<0.05). It was concluded that commercial feed supplemented with dl-methionine by 0.70% increased the growth performance of broilers.

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