Effects of dietary energy and protein levels on growth curve parameters of Khazak native chickens

Abstract This study was conducted to evaluate the effect of dietary energy (ME) and protein (CP) on growth parameters and absolute growth rates in the different ages of the Khazak chicks. A total of 360 one-day-old Khazak chicks were obtained from a local hatchery and in a 3×3 factorial experiment with completely randomized design, chicks were randomly allocated to experimental diets including 2,600, 2,800, and 3,000 kcal of ME/kg, and each containing 17, 19, and 21% CP from 7 to 98 days of age. Four growth model (Gompertz, Logistic, Lopez, and Richards) were fitted on weekly body weight data and the best model were selected by the goodness of fit criteria. Growth curve parameters were predicted for all chicks using the best model and other parameters including age (Ti) and weight (Wi) at the inflection point and absolute growth rate (AGR) in different ages were calculated from growth curve parameters. All parameters were analyzed using the general linear model procedure of SAS. Based on goodness of fit criteria, the Richards model had the lowest Akaike’s Information Criteria (AIC), root mean square error (RMSE), and highest adjusted determination coefficient (R2Adj) than other models and was selected as the best model. The effect of ME was significant on the mature index (k), Wi, Ti, and all AGR parameters (P<0.05) while CP levels were significant on final weight (Wf), Wi, and AGR parameters (P<0.05). The chicks fed with a diet containing 2,600 kcal of ME/kg and 17 % CP had the higher k parameter, and lower Wi, Ti, and AGR than those fed with other diets (P<0.05). Considering that the level of 2,800 kcal of ME/kg and 19 % CP had no significant difference with the level of 3,000 kcal of ME/kg and 21 % CP, therefore diet with 2,800 kcal of ME/kg and 19 % CP was suggested as optimum levels for change the growth curve parameter and having best performance for Khazak chickens during 7 to 98 days of old.

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LABORATORY TESTS OF THYROID FUNCTION IN HYPERTHYROIDISM II.

Acta Endocrinologica ◽

10.1530/acta.0.064s023 ◽

1969 ◽

Vol 62 (4_Suppla) ◽

pp. S23-S35

Author(s):

B.-A. Lamberg ◽

O. P. Heinonen ◽

K. Liewendahl ◽

G. Kvist ◽

M. Viherkoski ◽

...

Keyword(s):

Thyroid Function ◽

Laboratory Tests ◽

Goodness Of Fit ◽

Point Of View ◽

Accurate Estimation ◽

Diagnostic Efficiency ◽

Normal Limits ◽

Significant Difference ◽

Crossing Point ◽

Hyperthyroid Patients

ABSTRACT The distributions of 13 variables based on 10 laboratory tests measuring thyroid function were studied in euthyroid controls and in patients with toxic diffuse or toxic multinodular goitre. Density functions were fitted to the empirical data and the goodness of fit was evaluated by the use of the χ2-test. In a few instances there was a significant difference but the material available was in some respects too small to allow a very accurate estimation. The normal limits for each variable was defined by the 2.5 and 97.5 percentiles. It appears that in some instances these limits are too rigorous from the practical point of view. It is emphasized that the crossing point of the functions for euthyroid controls and hyperthyroid patients may be a better limit to use. In a preliminary analysis of the diagnostic efficiency the variables of total or free hormone concentration in the blood proved clearily superior to all other variables.

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Effects of Dietary Energy on Growth Performance, Rumen Fermentation and Bacterial Community, and Meat Quality of Holstein-Friesians Bulls Slaughtered at Different Ages

Animals ◽

10.3390/ani9121123 ◽

2019 ◽

Vol 9 (12) ◽

pp. 1123 ◽

Cited By ~ 4

Author(s):

Haibo Wang ◽

Hang Li ◽

Fei Wu ◽

Xinjun Qiu ◽

Zhantao Yu ◽

...

Keyword(s):

Bacterial Community ◽

Growth Performance ◽

Meat Quality ◽

Energy Levels ◽

Average Daily Gain ◽

Rumen Fermentation ◽

Dietary Energy ◽

Different Ages ◽

Slaughter Age

The objective of this study was to evaluate the effects of dietary energy levels on growth performance, rumen fermentation and bacterial community, and meat quality of Holstein-Friesians bulls slaughtered at different ages. Thirty-six Holstein-Friesians bulls (17 months of age) were divided into a 3 × 3 factorial experiment with three energy levels (LE, ME and HE; metabolizable energy is 10.12, 10.90 and 11.68 MJ/kg, respectively) of diets, and three slaughter ages (20, 23 and 26 months). Results indicated that bulls fed with ME and HE diets had higher dry matter intake, average daily gain, and dressing percentage at 23 or 26 months of age. The ME and HE diets also reduced bacterial diversity, altered relative abundances of bacteria and produced lower concentrations of acetate, but higher butyrate and valerate concentrations in rumen fluid. Increasing in dietary energy and slaughter age increased the intramuscular fat (IMF) and water holding capacity. In summary, Holstein-Friesians bulls fed with ME and HE diets, slaughtered at 23 and 26 months of age could be a good choice to produce beef with high IMF. Slaughter age may have less influence than dietary energy in altering fermentation by increasing amylolytic bacteria and decreasing cellulolytic bacteria, and thus, further affecting meat quality.

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Empirical comparison of skewed t-copula models for insurance and financial data

Model Assisted Statistics and Applications ◽

10.3233/mas-200506 ◽

2020 ◽

Vol 15 (4) ◽

pp. 351-361

Author(s):

Liwei Huang ◽

Arkady Shemyakin

Keyword(s):

Bayesian Estimation ◽

Goodness Of Fit ◽

Model Performance ◽

Information Criteria ◽

Stock Index ◽

Likelihood Method ◽

Special Importance ◽

Copula Model ◽

Technical Problems ◽

T Copula

Skewed t-copulas recently became popular as a modeling tool of non-linear dependence in statistics. In this paper we consider three different versions of skewed t-copulas introduced by Demarta and McNeill; Smith, Gan and Kohn; and Azzalini and Capitanio. Each of these versions represents a generalization of the symmetric t-copula model, allowing for a different treatment of lower and upper tails. Each of them has certain advantages in mathematical construction, inferential tools and interpretability. Our objective is to apply models based on different types of skewed t-copulas to the same financial and insurance applications. We consider comovements of stock index returns and times-to-failure of related vehicle parts under the warranty period. In both cases the treatment of both lower and upper tails of the joint distributions is of a special importance. Skewed t-copula model performance is compared to the benchmark cases of Gaussian and symmetric Student t-copulas. Instruments of comparison include information criteria, goodness-of-fit and tail dependence. A special attention is paid to methods of estimation of copula parameters. Some technical problems with the implementation of maximum likelihood method and the method of moments suggest the use of Bayesian estimation. We discuss the accuracy and computational efficiency of Bayesian estimation versus MLE. Metropolis-Hastings algorithm with block updates was suggested to deal with the problem of intractability of conditionals.

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A generalized Gompertz growth model with applications and related birth-death processes

Ricerche di Matematica ◽

10.1007/s11587-020-00548-y ◽

2020 ◽

Author(s):

Majid Asadi ◽

Antonio Di Crescenzo ◽

Farkhondeh A. Sajadi ◽

Serena Spina

Keyword(s):

Growth Model ◽

Growth Curve ◽

Goodness Of Fit ◽

Gompertz Model ◽

Death Process ◽

Birth Process ◽

Failure Data ◽

First Case ◽

Gompertz Growth Model ◽

Birth Death

AbstractIn this paper, we propose a flexible growth model that constitutes a suitable generalization of the well-known Gompertz model. We perform an analysis of various features of interest, including a sensitivity analysis of the initial value and the three parameters of the model. We show that the considered model provides a good fit to some real datasets concerning the growth of the number of individuals infected during the COVID-19 outbreak, and software failure data. The goodness of fit is established on the ground of the ISRP metric and the $$d_2$$ d 2 -distance. We also analyze two time-inhomogeneous stochastic processes, namely a birth-death process and a birth process, whose means are equal to the proposed growth curve. In the first case we obtain the probability of ultimate extinction, being 0 an absorbing endpoint. We also deal with a threshold crossing problem both for the proposed growth curve and the corresponding birth process. A simulation procedure for the latter process is also exploited.

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Using different levels of energy and protein and their effects on bodyweight and blood chemistry of ostriches

Veterinary Research Communications ◽

10.1007/s11259-021-09792-5 ◽

2021 ◽

Author(s):

Tahereh Nikravesh-Masouleh ◽

Alireza Seidavi ◽

Magdalena Solka ◽

Mohammad Dadashbeiki

Keyword(s):

Weight Gain ◽

Total Cholesterol ◽

Feed Intake ◽

Experimental Period ◽

Blood Chemistry ◽

Blood Parameters ◽

Bodyweight Gain ◽

Transferase Activity ◽

Dietary Energy ◽

Protein Levels

AbstractTo determine the effect of different dietary energy and protein levels on bodyweight and blood chemistry, 36 ostriches at 2 to 9 weeks of age for feeding conditions and 18 for blood chemistry parameters was used. The birds were divided into six treatment groups. Energy and protein levels of diet were 2400 and 2600 kcal/kg and 20%, 22%, and 24%, respectively. The feed intake and bodyweight gain were determined a weekly. Blood chemical parameters including glucose, HDL, LDL, total cholesterol, triglycerides, total protein, albumin, globulin, aspartate amino-transferase and alanine amino-transferase activity were determined. The highest weight gain during the whole experiment was observed in ostriches offered 2400 kcal · kg−1 dietary energy and 20% protein. The lowest level of total cholesterol and protein was observed in treatment V (2600 kcal · kg−1 dietary energy and 22% protein). The lowest level of glucose and triglycerides was noted after treatment I. The highest albumin and globulin concentrations were in treatment III (2400 kcal · kg−1 dietary energy and 24% protein) and treatment II (2400 kcal · kg−1 dietary energy and 22% protein), respectively. The energy level had no effect (P < 0.05) on feed intake and weight gain in all experimental period. The results of this study showed that with increasing energy and protein levels, most blood parameters increased in ostriches but total cholesterol did not.

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Estimating my equilibrium energy intake during lockdown: very introspective study

BMJ ◽

10.1136/bmj.m4561 ◽

2020 ◽

pp. m4561

Author(s):

R A Lewis

Keyword(s):

Body Weight ◽

Energy Intake ◽

Outcome Measures ◽

Dietary Energy ◽

Saturday Morning ◽

Dietary Energy Intake ◽

Body Weight Data ◽

Tuesday Afternoon ◽

Weight Data ◽

At Home

AbstractObjectiveTo estimate the daily dietary energy intake for me to maintain a constant body weight. How hard can it be?DesignVery introspective study.SettingAt home. In lockdown. (Except every Tuesday afternoon and Saturday morning, when I went for a run.)ParticipantsMe. n=1.Main outcome measuresMy weight, measured each day.ResultsSleeping, I shed about a kilogram each night (1.07 (SD 0.25) kg). Running 5 km, I shed about half a kilogram (0.57 (SD 0.15) kg). My daily equilibrium energy intake is about 10 000 kJ (10 286 (SD 201) kJ). Every kJ above (or below) 10 000 kJ adds (or subtracts) about 40 mg (35.4 (SD 3.2) mg).ConclusionsBody weight data show persistent variability, even when the screws of control are tightened and tightened.

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Container Throughput Forecasting Using Dynamic Factor Analysis and ARIMAX Model

PROMET - Traffic&Transportation ◽

10.7307/ptt.v29i5.2334 ◽

2017 ◽

Vol 29 (5) ◽

pp. 529-542 ◽

Cited By ~ 8

Author(s):

Marko Intihar ◽

Tomaž Kramberger ◽

Dejan Dragan

Keyword(s):

Factor Analysis ◽

Goodness Of Fit ◽

Moving Average ◽

Real Data ◽

Information Criteria ◽

Dynamic Factor Analysis ◽

Forecasting Model ◽

Dynamic Factor ◽

Macroeconomic Indicators ◽

The Impact

The paper examines the impact of integration of macroeconomic indicators on the accuracy of container throughput time series forecasting model. For this purpose, a Dynamic factor analysis and AutoRegressive Integrated Moving-Average model with eXogenous inputs (ARIMAX) are used. Both methodologies are integrated into a novel four-stage heuristic procedure. Firstly, dynamic factors are extracted from external macroeconomic indicators influencing the observed throughput. Secondly, the family of ARIMAX models of different orders is generated based on the derived factors. In the third stage, the diagnostic and goodness-of-fit testing is applied, which includes statistical criteria such as fit performance, information criteria, and parsimony. Finally, the best model is heuristically selected and tested on the real data of the Port of Koper. The results show that by applying macroeconomic indicators into the forecasting model, more accurate future throughput forecasts can be achieved. The model is also used to produce future forecasts for the next four years indicating a more oscillatory behaviour in (2018-2020). Hence, care must be taken concerning any bigger investment decisions initiated from the management side. It is believed that the proposed model might be a useful reinforcement of the existing forecasting module in the observed port.

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Long-term treadmill training ameliorates endothelium-dependent vasorelaxation mediated by insulin and insulin-like growth factor-1 in hypertension

Journal of Applied Physiology ◽

10.1152/japplphysiol.01062.2014 ◽

2015 ◽

Vol 119 (6) ◽

pp. 663-669 ◽

Cited By ~ 6

Author(s):

Yi-Yuan Lin ◽

Shin-Da Lee ◽

Chia-Ting Su ◽

Tsung-Lin Cheng ◽

Ai-Lun Yang

Keyword(s):

Growth Factor ◽

Insulin Receptor ◽

Treadmill Training ◽

Control Group ◽

Insulin Like Growth Factor ◽

Hypertensive Rats ◽

Protein Levels ◽

Significant Difference ◽

Nos Inhibitors

Dysfunction of insulin and insulin-like growth factor-1 (IGF-1) is associated with the pathophysiology of hypertension. The influence of long-term exercise on vascular dysfunction caused by hypertension remains unclear. We investigated whether long-term treadmill training improved insulin- and IGF-1-mediated vasorelaxation in hypertensive rats. Eight-week-old male spontaneously hypertensive rats (SHR) were randomly divided into sedentary and exercise (SHR-EX) groups. The SHR-EX group was trained on a treadmill for 60 min/day, 5 days/wk, for 8 wk. Wistar-Kyoto rats (WKY) were used as the normal control group. After training, aortic insulin- and IGF-1-mediated vasorelaxation was evaluated in organ baths. Additionally, the roles of phosphatidylinositol 3-kinase (PI3K), nitric oxide synthase (NOS), and aortic protein expression were examined in the three groups. Compared with sedentary SHR and WKY groups, insulin- and IGF-1-mediated vasorelaxation was significantly enhanced to a nearly normal level in the SHR-EX group. After endothelial denudation, blunted and comparable vasorelaxation was found among the three groups. Pretreatment with selective PI3K and NOS inhibitors attenuated insulin- and IGF-1-mediated vasorelaxation, and no significant difference was found among the three groups after the pretreatment. The aortic protein levels of the insulin receptor (IR), IGF-1 receptor (IGF-1R), insulin receptor substrate-1 (IRS-1), and endothelial NOS (eNOS) were also significantly increased in the SHR-EX group compared with the other two groups. These results suggested that treadmill training elicited the amelioration of endothelium-dependent insulin/IGF-1-mediated vasorelaxation partly via the increased activation of PI3K and NOS, as well as the enhancement of protein levels of IR, IGF-1R, IRS-1, and eNOS, in hypertension.

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Ghrelin Gene Expression in Broiler Proventriculus Tissue are Changed by Feed Restriction, Different Dietary Energy and Protein Levels

American Journal of Animal and Veterinary Sciences ◽

10.3844/ajavsp.2010.175.179 ◽

2010 ◽

Vol 5 (3) ◽

pp. 175-179 ◽

Cited By ~ 1

Author(s):

Shokoufe Ghazanfari ◽

Mohammad Reza Nassiry ◽

Mojtaba Tahmooresp ◽

Abdolreza Salehi ◽

Karim Nobari

Keyword(s):

Gene Expression ◽

Feed Restriction ◽

Dietary Energy ◽

Protein Levels ◽

Ghrelin Gene

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Growth and movement of the South African abalone Haliotis midae: A reassessment

Marine and Freshwater Research ◽

10.1071/mf9950583 ◽

1995 ◽

Vol 46 (3) ◽

pp. 583 ◽

Cited By ~ 20

Author(s):

RJQ Tarr

Keyword(s):

South African ◽

Growth Rates ◽

Growth Parameters ◽

Eastern Coast ◽

Island Population ◽

Western Coast ◽

Eastern Cape ◽

The South ◽

Significant Difference ◽

Haliotis Midae

Growth rates of a number of Haliotis midae populations around the South African coast were studied by means of tagging. These populations ranged from the cool waters of the western coast to the more temperate environment of the eastern Cape. Standard von Bertalanffy growth curves were fitted and growth parameters derived. These ranged from 0.19 to 0.25 for K, the average rate at which L∞ is approached, and from 156 to 173 for L∞, the average theoretical maximum length. These indicate far higher growth rates than were previously published for this commercially fished species, and the reasons for this difference are discussed. The expectation that growth rates would be fastest in the warmer eastern Cape waters was not realized, there being no significant difference in growth between the Bird Island population on the eastern coast and the Robben Island population on the western coast. These new growth parameters indicate that H. midae in the commercial fishery grounds is attaining sexual maturity some four years earlier, and the minimum legal size some five years earlier, than previously considered. This has considerable significance for modelling studies presently underway. Movement of a small population of adult H. midae was studied over a three-year period, after which 47% of the original abalone were still present on the study site. Of these, 81.5% still occupied exactly the same position on the rocks. This indicates that H. midae that have located an optimum habitat, and that are not disturbed, tend not to move.

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