Uticaj genotipa, pola i trajanja tova na efikasnost proizvodnje ćurećeg mesa

The main goal of this work was comparative testing of fattening (body weight - gain, consumption - feed conversion and mortality) and classical (meat yield, warm and chilled carcasses, classical carcass yield - “prepared for the grill”) characteristics of two line hybrids of turkey (Hybrid Converter and Nicholas) fattened up to ten weeks (male and female specimens), i.e. up to 12, 14, 16 and 18 weeks of age (male specimens). Male specimens in relation to females had a higher growth, so that at the end of the tenth week of age average weight of male broilers was 5.22 kg (Hybrid Converter) and 4.64 kg (Nicholas). With eighteen weeks, average weight of males was 12.80 kg (Hybrid Converter) and 13.44 kg (Nicholas). Mortality till the tenth week of age (both genders of turkeys) was 5.07% (Hybrid Converter) and 4.17% (Nicholas). From the tenth to the eighteenth week of age mortality of males was 9.02% (Hybrid Converter) and 12.31% (Nicholas). Feed conversion to the tenth week of age to turkeys of the both genders was 2.47 kg (Hybrid Converter) and 2.49 kg (Nicholas). From the tenth to the eighteenth week of age feed conversion to the males was 3.72 kg (Hybrid Converter) and 3.82 kg (Nicholas). To the both hybrids of turkey, male specimens had statistically significant (P lt 0.05) lower yield of meat of warm and chilled carcasses, (carcass yield) at the age of ten weeks. Then, carcasses yield of the both sexes Hybrid Converter in relation to Nicholas was statistically significant lower (P lt 0.05). Therewith, yield of warm carcasses of males was statistically significant (P lt 0.05) lower to the hybrid Hybrid Converter in relation to the Nicholas at each age (12th, 16th, and 18th week), except 14th week because determined difference (-0.63%) wasn’t statistically confirmed (P>0.05). Similar statistical significance had been determined to the yield of chilled carcasses.Osnovni cilj ovog rada je bio uporedno ispitivanje tovnih (telesna masa - prirast, utrošak - konverzija hrane i mortalitet) i klaničnih (prinos mesa toplih i ohlađenih trupova - klanicni randman “spremno za roštilj”) osobina dva linijska hibrida ćuraka (Hybrid Converter i Nicholas) tovljenih do 10 nedelja (muška i ženska grla), odnosno 12, 14, 16 i 18 nedelja starosti (muška grla). Muška grla, u odnosu na ženska, su imala veći prirast, tako da je na kraju 10. nedelje starosti prosecna masa muških brojlera iznosila 5,22 kg (Hybrid Converter) i 5,75 kg (Nicholas), a ženskih 4,67 kg (Hybrid Converter) i 4,64 kg (Nicholas). Sa 18 nedelja prosecna masa muških grla iznosila je 12,80 kg (Hybrid Converter) i 13,44 kg (Nicholas). Mortalitet do 10. nedelje starosti (oba pola ćuraka) iznosio je 5,07% (Hybrid Converter) i 4,17% (Nicholas). Od 10. do 18. nedelje starosti mortalitet muških grla iznosio je 9,02%o (Hybrid Converter) i 12,31%o (Nicholas). Konverzija hrane do 10. nedelje starosti brojlera oba pola iznosila je 2,47 kg (Hybrid Converter) i 2,49 kg (Nicholas). Od 10. do 18. nedelje konverzija hrane kod muških grla iznosila je 3,72 kg (Hybrid Converter) i 3,82 kg (Nicholas). Kod oba hibrida ćuraka muška grla su imala statistički značajno (P lt 0,05) manji prinos mesa toplih i ohlađenih trupova (klanični randman) pri starosti 10 nedelja. Prinos trupova oba pola brojlera Hybrid Converter u odnosu na Nicholas je bio statistički signifikantno manji (P lt 0,05). Pored toga, prinos toplih trupova muških grla je bio statistički signifikantno (P lt 0,05) manji kod hibrida Hybrid Converter, u odnosu na Nicholas, pri svakoj starosti (12., 16. i 18. nedelji), osim 14. nedelje, jer utvrđena razlika (-0,63%o) nije statistički potvrđena (P>0,05). Slična statistička značajnost utvrđena je i kod prinosa ohlađenih trupova

LUMBAL AND ABDDOMINAL MUSCLES ISOMETRIC POTENTIAL IN VOLLEYBALL CADETS

The aim of this study was to analyze the possible differences in spinal lumbar and abdominal muscles isometric potential of prospective male and female volleyball players, the cadet selection of Serbia, aged 14 ± 6 months. Sample included 42 subjects with mean height 177, 38 cm (SD ± 6, 36), and mean weight 56, 02 kg (SD ± 7, 28), 15 male and 27 female subjects. Isometric muscle potential assessment was conducted using four standardized motor movement tasks. In addition to the descriptive statistics used, as basis statistics, the t-test for independent samples was used, to compare the mean values of parameters measured in two different groups of athletes – volleyball players (girls – boys). Descriptive indicators of the sample suggest greater values of deep spinal muscles isometric potential with boys in all study variables. Study results gained by the t-test of independent samples indicate that statistically significant difference exists between their mean results in variables of trunk flexor static contractions and trunk extensor static contractions, at the level 0.001. With other two variables, the values indicate that difference between genders is not significant but accidental

PHYSICAL CHARACTERISTICS AND EXPLOSIVE STRENGTH OF SCHOOLCHILDREN

The aim of this research was to determine the trend of relations between the system of body characteristics and the system of explosive strength variables. 402 subjects aged 7 to 10 participated in this study. There were applied 17 measures for assessing the anthropometric characteristics and 4 test to assess explosive strength. Based on the obtained results on the relation of body characteristics and explosive strength it has been determined that there are significant relations of the two studied areas on the subsamples of subjects aged 8, 9 and 10. Relations on the subsample of subjects aged 7 are not statistically significant (p<0.05).  When it comes to the trend of relations between the ages of 7 to 10 a permanent increase is evident, except for the subsample of subjects aged 8, which shows a slight decline compared to the subjects aged 7. Based on the cross-correlation of the two studied area, it can be concluded that voluminosity and skinfolds measures appear negative (interfering) to tasks performance which highlights the explosive leg strength in all the subsamples of subjects

The effect of phytohormones application on morphological and biological properties of Thymus pannonicus All.

This study has explored the effect of three phytohormones application, based on α-naphthyl acetic acid, named INCIT 1, INCIT 8 and INCIT K, on the root system growing potential and rooting stimulation of Thymus pannonicus All. cuttings. This plant is highly reputable not only in a folk medicine, but also recognized in the business sector, due to a multiple uses and beneficial effects on human health. The research was located in Veliko Središte, Vršac (Serbia) and conducted in May, 2021. The cuttings were dipped in a powdered formulation of phytohormones and placed in plastic containers pre-filled with commercial substrate. The phytohormone-free variant was taken as a control. After 2 months, the cuttings were removed and the morphological and biological properties (polyphenols content and antioxidant activity by DPPH radical and FRAP method) were measured. Based on the morphological results, all of treated samples showed satisfactory behaviour, whereby the most suitable phytohormone to stimulate the growth of cuttings was INCIT 8, in which the average weight of the aboveground vegetative part of the plant and root mass were higher for more than 60% in relation to the control; the number of roots were about 25% higher, whereby the mass of the whole plant was almost 3 times increased. Considering the biological activities in a 5% aqueous infusions of the samples, it was found that the polyphenols content and the antioxidant activity were lowered in treated samples, with relation to the control, excluding the sample INCIT 8 where the FRAP value was slightly increased, while the inhibition of DPPH radicals was higher by around 15%. The applied phytohormone treatment may ensure economically viable yields of standard or even improved plant quality. In the following period, it is expected that all of treated adult plants will have a higher content of biologically active substances.UNIFood2021 Conference, 24th-25th September 2021 University of Belgrade, 2nd International UNIfood Conferenc

Easily Applicable Predictive Score for Differential Diagnosis of Prefibrotic Primary Myelofibrosis from Essential Thrombocythemia

Essential thrombocythemia (ET) and prefibrotic primary myelofibrosis (prePMF) initially have a similar phenotypic presentation with thrombocytosis. The aim of our study was to determine significant clinical-laboratory parameters at presentation to differentiate prePMF from ET as well as to develop and validate a predictive diagnostic prePMF model. This retrospective study included 464 patients divided into ET (289 pts) and prePMF (175 pts) groups. The model was built using data from a development cohort (229 pts; 143 ET, 86 prePMF), which was then tested in an internal validation cohort (235 pts; 146 ET, 89 prePMF). The most important prePMF predictors in the multivariate logistic model were age ≥ 60 years (RR = 2.2), splenomegaly (RR = 13.2), and increased lactat-dehidrogenase (RR = 2.8). Risk scores were assigned according to derived relative risk (RR) for age ≥ 60 years (1 point), splenomegaly (2 points), and increased lactat-dehidrogenase (1 point). Positive predictive value (PPV) for pre-PMF diagnosis with a score of ≥points was 69.8%, while for a score of ≥3 it was 88.2%. Diagnostic performance had similar values in the validation cohort. In MPN patients with thrombocytosis at presentation, the application of the new model enables differentiation of pre-PMF from ET, which is clinically relevant considering that these diseases have different prognoses and treatments

METRIC TESTS CHARACTERISTIC FOR ESTIMATING JUMPING FOR VOLLEYBALL PLAYERS

With goal to establish metric tests characteristics for estimating jumping for volleyball players, it was organized a pilot research on pattern of 23 volleyball players from cadet team and 23 students from high-school. For needs of this research four tests are valid for estimation, jump in block with left and right leg and jump in spike with left and right leg. Each test has been taken three times, so that we could with test-re test method determine their reliability, and with factor analysis their validity. Data were processed by multivariate analysis (item analysis, factor analysis) from statistical package „Statistica 6.0 for windows“. On the results of research and discussion we can say that the tests had high coefficient of reliability, as well as factor validity, and these tests can be used to estimate jumping for volleyball players

THE EFFECTS OF SIXWEEKS PROGRAM OF PLYOMETRIC TRENING ON VOLLEYBALL JUMPING

With goal to examine effects of plyometric training program on development of jumping strength for volleyball players, it was organized an experimental research on pattern of 23 volleyball players from cadet team and 23 students from high-school. Guided by general principles for plyometric training, individual plans for training were made. For estimating the effects of sports training on development of jumping, eight variables were used. For needs of this research four tests are valid for estimation, jump in block with left and right leg and jump in spike with left and right leg. Experiment has been realized in the second part on conditional preparations, and lasted for six weeks with two or three trainings per week. Control group had physical education lessons at their schools twice a week. Data were processed by in variant, multivariate analysis and analysis of covariance. On the results of research and discussion we can say that the model of training we used for development of jumping as a basic factor in experimental group brought statistically bigger difference in improving jumping that it brought in control group

PRIMENA PLIOMETRIJSKOG METODA TRENINGA U ODBOJCI

Knowledge in various fields of science and the profession is gained from different written information sources today. Their quality is directly dependent on ability to further educate the reader and therefore improve the existing level of knowledge about certain phenomena. The study presents a systematic review and analysis of previous studies, published in the last twenty years, on the application of plyometric training method in volleyball. A descriptive and historical methods are used, and data source are different electronic articles appropriate to the topic, as well as printed literature. Plyometric method and its application in practice, even today, causes a lot of controversy among experts and researchers, and therefore cannot make a unique conclusion. However, experts have agreed that the application of plyometric training method in volleyball can achieve the effects of applying this method, primarily to improve the vertical jump and vertical jump in volleyball

STRUKTURA KOGNITIVNIH SPOSOBNOSTI PERSPEKTIVNIH BOKSERA

All psychosomatic characteristics and abilities are very important for achieving sportingsuccess in boxing. Therefore, it is the obligation of professionals to seek out, among other things, new methods that permit the identification of personality dimensions andtheir connections, which are responsible for achieving success in sport. We analyzed the structure of boxers’ cognitive abilities. The research’s mission is to determine the structure of boxers’ cognitive abilities. The study is managed with the hypothesis: H1-In the space of cognitive abilities it is expected to obtain a general factor. The population from which the sample was taken for this study can be defined as a population of boxers from boxing clubs in Serbia aged 15-19 years. Our sample of 100 boxers, boxing club members from Serbia, was optimal for the planned research. Basic cognitive processes can be reduced to perceptual functions, parallel and serial processes, which are probably controlled by a central processor responsible for coordinating all cognitive functions

RAZLIKE U MOTORIČKIM SPOSOBNOSTIMA UČENIKA SPORTISTA I UČENIKA NESPORTISTA

Teaching physical education in primary schools takes more character to growing concerns that stem from the personal attitude of the students teaching on the one hand, and poor motivation of teachers due to lack of adequate working conditions for the other. As the official attitude of the community not to allow such a situation, the more we meet with the appearance of lack of justification to continue the spread of pronunciation, and very little to takemeasures to combat such a situation. Testing in sport and physical education, at the present time is the present phenomenon than it was before. Course planned test involves measuring the organized team sports, students in specialized conditions (laboratories). However, testing is a term that includes the daily, routine measurement of results in the function of training process monitoring results as either transverse or longitudinal cross-section of states. Motor skills are one of the psychosomatic status, which expresses the efficiency of motor response and motor behavior of humans. Motor skills are very important part during the building of sports performance in most sports. One part of the motor abilities under significant influence of genetic factors, while the other part subject to the influence of various external factors, especially in sports exercise which is represented in physical education and sports training for children and youth, sports and recreation for adults