A model to determine growth rate of heavy hybrid turkeys

U radu je istražena primjena generalizirane logističke funkcije u modeliranju rasta teškog hibrida pura. Istraživanje je trajalo 19 tjedana, tijekom kojih je kontroliran rast 20 muških i 20 ženskih pura provenijencije Nicholas 700. Tijekom čitavog razdoblja tova razlike u živim težinama između purana i pura bile su statistički vrlo visoko značajne (P<0,001). Na kraju istraživanja purani su u prosjeku bili teški 15,17 kg, a pure 10,88 kg. Purani su od pura bili teži za otprilike 4,3 kg ili 39,53%. Prosječni tjedni prirasti kod purana bili su 795 g, a kod pura 577 g, dok su prosječne stope rasta u tovu teškog hibrida bile 12,45% (mužjaci) i 12,11% (ženke). Procjene točke infleksije i pojedinih faza rasta po spolu pura obavljene su primjenom generalizirane logističke funkcije: Koeficijenti asimetrije bili su γ=0,2 (purani) i γ=0,3 (pure). Biološki maksimum za purane bio je 18,57 kg a za pure 12,63 kg. Prema izračunatim parametrima točka infleksije kod pura je početkom, a kod purana sredinom 10.tjedna tova kada su teški 5,27 kg (pure) i 7,46 kg (purani). Na temelju rezultata primijenjenog modela (generalizirana logistička funkcija) u opisivanju rasta pura teškog hibrida može se istaknuti skako ženke završavaju intenzivnu fazu rasta skoro tjedan dana ranije nego mužjaci, a točka infleksije kod pura nastupa ranije nego kod purana.The objective of this study was to investigate the application of generalized logistic function to the heavy hybrid turkey growth modeling. The growth of 20 turkey toms and 20 turkey hens of Nicholas 700 provenience was monitored over 19 weeks. During the whole fattening period, differences in live weights between males and females were statistically highly significant (P<0.001). At the end of the experiment, turkey toms weighed on average 15.17 kg, compared to 10.88 kg of average turkey hens live weight. Males weighed approximately 4.3 kg or 39.53% more than females. Average weekly gain of turkey toms was 795 g, and of turkey hens 577 g. Average growth rate of turkey toms was 12.45% and of turkey hens 12.11%. Evaluation of inflection point and each growth phase for both turkey sexes was carried out by using generalized logistic function: Coefficients of asymmetry were γ=0.2 (males) and γ=0.3 (females). Biological maximum was 18.57 kg for males, and 12.63 kg for females. According to calculated parameters, inflection point in turkey hens occurred at the beginning of the 10th week of fattening, when they reached 5.27 kg; in turkey toms it occurred in the middle of the 10th week, at the weight of 7.46 kg. On the basis of the results obtained by using the model of generalized logistic function for turkey growth rate description, it was concluded that turkey hens ended their intensive growth phase about a week earlier than turkey toms, with the inflection point also starting earlier than in turkey toms

Least-squares fitting Gompertz curve

AbstractIn this paper we consider the least-squares (LS) fitting of the Gompertz curve to the given nonconstant data (pi,ti,yi), i=1,…,m, m⩾3. We give necessary and sufficient conditions which guarantee the existence of the LS estimate, suggest a choice of a good initial approximation and give some numerical examples

ANALYSIS OF THE CHICK GROWTH CHARACTERISTICS BY MEANS OF ASYMETRIC S-FUNCTION

U radu su istraživane fenotipske značajke rasta Arbor Acres pilića do 6. tjedna odnosno 10. tjedna. U istraživanja je uključeno po 30 pilića ženskog odnosno muškog spola. U modeliranju krivulje rasta upotrebljena je asimetrična S-funkcija. Pomoću navedene funkcije utvrđene su karakteristične faze rasta i točka infleksije. Istraživanje je pokazalo da je asimetrična S-funkcija prikladna i za prognozu životne mase pilića do 10. tjedna.This article deals with the analysis of phenotypic growth characteristics of the Arbor Acres chicks till the 6th, i. e. 10th week of age. The study included 30 female and male chicks. An asymmetric S function was applied as a growth curve. The characteristics of the growth stages and the point of inflection were determined. The study showed that the asymmetric S-function was adequate for forecasting the weight, i. e. live mass of the chicks till the 10th week of age

Peri-operative red blood cell transfusion in neonates and infants: NEonate and Children audiT of Anaesthesia pRactice IN Europe: A prospective European multicentre observational study

BACKGROUND: Little is known about current clinical practice concerning peri-operative red blood cell transfusion in neonates and small infants. Guidelines suggest transfusions based on haemoglobin thresholds ranging from 8.5 to 12 g dl-1, distinguishing between children from birth to day 7 (week 1), from day 8 to day 14 (week 2) or from day 15 (≥week 3) onwards. OBJECTIVE: To observe peri-operative red blood cell transfusion practice according to guidelines in relation to patient outcome. DESIGN: A multicentre observational study. SETTING: The NEonate-Children sTudy of Anaesthesia pRactice IN Europe (NECTARINE) trial recruited patients up to 60 weeks' postmenstrual age undergoing anaesthesia for surgical or diagnostic procedures from 165 centres in 31 European countries between March 2016 and January 2017. PATIENTS: The data included 5609 patients undergoing 6542 procedures. Inclusion criteria was a peri-operative red blood cell transfusion. MAIN OUTCOME MEASURES: The primary endpoint was the haemoglobin level triggering a transfusion for neonates in week 1, week 2 and week 3. Secondary endpoints were transfusion volumes, 'delta haemoglobin' (preprocedure - transfusion-triggering) and 30-day and 90-day morbidity and mortality. RESULTS: Peri-operative red blood cell transfusions were recorded during 447 procedures (6.9%). The median haemoglobin levels triggering a transfusion were 9.6 [IQR 8.7 to 10.9] g dl-1 for neonates in week 1, 9.6 [7.7 to 10.4] g dl-1 in week 2 and 8.0 [7.3 to 9.0] g dl-1 in week 3. The median transfusion volume was 17.1 [11.1 to 26.4] ml kg-1 with a median delta haemoglobin of 1.8 [0.0 to 3.6] g dl-1. Thirty-day morbidity was 47.8% with an overall mortality of 11.3%. CONCLUSIONS: Results indicate lower transfusion-triggering haemoglobin thresholds in clinical practice than suggested by current guidelines. The high morbidity and mortality of this NECTARINE sub-cohort calls for investigative action and evidence-based guidelines addressing peri-operative red blood cell transfusions strategies. TRIAL REGISTRATION: ClinicalTrials.gov, identifier: NCT02350348

Azimuthal anisotropy of charged jet production in root s(NN)=2.76 TeV Pb-Pb collisions

We present measurements of the azimuthal dependence of charged jet production in central and semi-central root s(NN) = 2.76 TeV Pb-Pb collisions with respect to the second harmonic event plane, quantified as nu(ch)(2) (jet). Jet finding is performed employing the anti-k(T) algorithm with a resolution parameter R = 0.2 using charged tracks from the ALICE tracking system. The contribution of the azimuthal anisotropy of the underlying event is taken into account event-by-event. The remaining (statistical) region-to-region fluctuations are removed on an ensemble basis by unfolding the jet spectra for different event plane orientations independently. Significant non-zero nu(ch)(2) (jet) is observed in semi-central collisions (30-50% centrality) for 20 <p(T)(ch) (jet) <90 GeV/c. The azimuthal dependence of the charged jet production is similar to the dependence observed for jets comprising both charged and neutral fragments, and compatible with measurements of the nu(2) of single charged particles at high p(T). Good agreement between the data and predictions from JEWEL, an event generator simulating parton shower evolution in the presence of a dense QCD medium, is found in semi-central collisions. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Peer reviewe

Forward-central two-particle correlations in p-Pb collisions at root s(NN)=5.02 TeV

Two-particle angular correlations between trigger particles in the forward pseudorapidity range (2.5 2GeV/c. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B. V.Peer reviewe

Event-shape engineering for inclusive spectra and elliptic flow in Pb-Pb collisions at root(NN)-N-S=2.76 TeV

Peer reviewe

Production of He-4 and (4) in Pb-Pb collisions at root(NN)-N-S=2.76 TeV at the LHC

Results on the production of He-4 and (4) nuclei in Pb-Pb collisions at root(NN)-N-S = 2.76 TeV in the rapidity range vertical bar y vertical bar <1, using the ALICE detector, are presented in this paper. The rapidity densities corresponding to 0-10% central events are found to be dN/dy4(He) = (0.8 +/- 0.4 (stat) +/- 0.3 (syst)) x 10(-6) and dN/dy4 = (1.1 +/- 0.4 (stat) +/- 0.2 (syst)) x 10(-6), respectively. This is in agreement with the statistical thermal model expectation assuming the same chemical freeze-out temperature (T-chem = 156 MeV) as for light hadrons. The measured ratio of (4)/He-4 is 1.4 +/- 0.8 (stat) +/- 0.5 (syst). (C) 2018 Published by Elsevier B.V.Peer reviewe

Pseudorapidity and transverse-momentum distributions of charged particles in proton-proton collisions at root s=13 TeV

The pseudorapidity (eta) and transverse-momentum (p(T)) distributions of charged particles produced in proton-proton collisions are measured at the centre-of-mass energy root s = 13 TeV. The pseudorapidity distribution in vertical bar eta vertical bar <1.8 is reported for inelastic events and for events with at least one charged particle in vertical bar eta vertical bar <1. The pseudorapidity density of charged particles produced in the pseudorapidity region vertical bar eta vertical bar <0.5 is 5.31 +/- 0.18 and 6.46 +/- 0.19 for the two event classes, respectively. The transverse-momentum distribution of charged particles is measured in the range 0.15 <p(T) <20 GeV/c and vertical bar eta vertical bar <0.8 for events with at least one charged particle in vertical bar eta vertical bar <1. The evolution of the transverse momentum spectra of charged particles is also investigated as a function of event multiplicity. The results are compared with calculations from PYTHIA and EPOS Monte Carlo generators. (C) 2015 CERN for the benefit of the ALICE Collaboration. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Peer reviewe