Using Nonlinear Models to Describe Body Weight Growth Curves in Three Different Lines of Japanese Quail

2017 ◽  
Vol 52 (1) ◽  
pp. 81
Author(s):  
fatma Abdallah
Keyword(s):  
Body Weight ◽  
Japanese Quail ◽  
Nonlinear Models ◽  
Growth Curves ◽  
Weight Growth

The growth of lambs before and after birth in relation to the level of nutrition

1948 ◽  
Vol 38 (3) ◽  
pp. 243-302 ◽  
Author(s):  
L. R. Wallace
Keyword(s):  
Body Weight ◽  
Actual Body ◽  
Growth Curves ◽  
Live Weight ◽  
Constant Level ◽  
Gravid Uterus ◽  
Standard Diet ◽  
Actual Body Weight ◽  
Weight Growth ◽  
Before And After

SUMMARYIn the investigation described, we have observed a t monthly intervals throughout gestation the changes taking place in a series of similar ewes, in lamb to the same ram, and each receiving the same standard diet.In following the live-weight growth curves of the ewes it was found that on a constant level of feeding the weight gains became greater during each succeeding month of pregnancy, and at corresponding stages were larger for ditocous than for monotocous ewes. This was found to be due to the fact that, although on our diet the ewes did gain slightly in actual body weight, the main increases in live weight resulted from the growth of the gravid uterus itself, and this increases in weight far more rapidly in the later stages of gestation, and is also heavier where twins are carried.

scholarly journals Growth Curves of Japanese Quail as Modified by Divergent Selection for 4-Week Body Weight

1986 ◽  
Vol 65 (10) ◽  
pp. 1825-1833 ◽  
Author(s):  
NICHOLAS B. ANTHONY ◽  
KARL E. NESTOR ◽  
WAYNE L. BACON
Keyword(s):  
Body Weight ◽  
Japanese Quail ◽  
Growth Curves ◽  
Divergent Selection ◽  
Selection For

Live-weight growth from embryo to adult in domesticated mammals

1980 ◽  
Vol 31 (3) ◽  
pp. 223-235 ◽  
Author(s):  
C. S. Taylor
Keyword(s):  
Body Weight ◽  
Growth Curves ◽  
Live Weight ◽  
Postnatal Growth ◽  
Species Relationship ◽  
Domestic Species ◽  
Regression Curves ◽  
Weight Growth ◽  
Metabolic Age ◽  
Degree Of Maturity

ABSTRACTThe inter-species relationship between mature body weight and time taken to mature in body weight was studied empirically in nine domestic species with data ranging from early embryonic to late postnatal growth. When examined in terms of genetic size scaling, the results showed that metabolic age provided a readily useable comparative age scale which would allow results obtained from one species to advance the study of growth and nutrition in other species.A standardized growth curve was therefore calculated for each species in terms of degree of maturity in body weight and metabolic age. The two standardized regression curves gave mean growth curves that estimated expected degree of maturity at a given metabolic age and expected metabolic age at a given degree of maturity. The two mean curves scarcely differed.Deviations of each species from these mean curves were analysed. There were significant standardized differences between species in earliness of maturing. Rabbits were estimated to mature in 30% less time than expected for their size, a deviation which (if repeatable) could be of great potential importance to animal production.

scholarly journals Growth curves in meat-type and laying quail: a Bayesian perspective

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2743
Author(s):  
Robson Marcelo Rossi ◽  
Daiane De Oliveira Grieser ◽  
Vagner De Almeida Conselvan ◽  
Simara Márcia Marcato
Keyword(s):  
Body Weight ◽  
Bayesian Approach ◽  
Goodness Of Fit ◽  
Nonlinear Models ◽  
Growth Curves ◽  
Gompertz Model ◽  
Body Growth ◽  
Coturnix Coturnix ◽  
Body Weight Data ◽  
Meat Type

The aim of this study was to assess the goodness of fit for nonlinear models, using the best model to describe body growth curves, comparing the parameters obtained for gender and one meat-type (Coturnix coturnix coturnix) and two laying (Coturnix coturnix japonica) quail strains, as well as nesting via MCMC (Markov chain Monte Carlo processes) methods under a Bayesian approach. A total of 1,350 one-day-old mixed quail were used: 400 of meat-type, 450 of yellow laying, and 500 of red laying strains distributed in a completely randomized design with three treatments (each treatment corresponded to one strain) and five replications. The experimental period consisted of 1 to 42 days of age. At 21 days of age, quail sexing was performed by means of sexual dimorphism, being individually identified at one day of age with numbered rings, allowing determining growth curves by gender. Birds were reared in a conventional system, fed ad libitum with diets formulated to meet nutritional requirements. Body weight was determined weekly and assessed using nonlinear models: Logistic, Brody, Von Bertalanffy, and Gompertz, whose parameters were estimated under a Bayesian approach via MCMC algorithm by means of BRugs package from the software R. DIC (Deviance Information Criterion) criterion was used to select the best nonlinear model, i.e. the lower the DIC value is, the better the model goodness of fit to the data. Gompertz model was better adjusted to the data regardless the gender or strain. Meat-type quail had the highest asymptotic weights and the highest age at which growth rate was maximum, followed by red and yellow strains. All nestings presented significant differences (p < 0.05) between gender for contrasted parameters. Meat-type, yellow, and red females presented values significantly (p < 0.05) higher for asymptotic weight (370, 203, and 215 g, respectively) when compared to males (274, 131, and 143 g, respectively), which were earlier in body growth. Gompertz model was better adjusted to body weight data of quail regardless the gender or strain and the Bayesian approach allowed obtaining accurate estimations. Meat-type strain presented the highest body asymptotic weight, followed by red and yellow laying strains. Females presented higher asymptotic weight than that found for males of their respective strains but were later in growth.

scholarly journals Nonlinear models of Brazilian sheep in adjustment of growth curves

2018 ◽  
Vol 63 (No. 8) ◽  
pp. 331-338 ◽  
Author(s):  
Paz Claudia Cristina Paro de ◽  
Venturini Guilherme Costa ◽  
Contini Enio ◽  
Costa Ricardo Lopes Dias da ◽  
Lameirinha Luara Paula ◽  
...  
Keyword(s):  
Body Weight ◽  
Repeated Measures ◽  
Nonlinear Models ◽  
Logistic Models ◽  
Growth Curves ◽  
Gompertz Model ◽  
Linear Quadratic ◽  
Significant Difference ◽  
Biological Interpretation ◽  
Males And Females

Growth curves of the Morada Nova sheep males and females were described using nonlinear models and the relationships between body weight and thoracic circumference were evaluated. Altogether 1516 repeated measures of body weight and thoracic circumference of the Morada Nova sheep (668 males and 848 females) taken since birth till 730 days of age were used. The Brody, Richards, von Bertalanffy, Gompertz, and Logistic models have been tested. The Fisher’s test (F) was used to verify the differences (P &lt; 0.05) in growth curves between males and females. The Gompertz model presented a significant difference (P &lt; 0.001) for growth curve parameters between males (asymptotic weight (A) = 40.5 kg and maturing rate (k) = 0.0043 kg/day) and females (A = 36.44 kg and k = 0.0028 kg/day). The relationships between body weight and thoracic circumference presented R<sup>2</sup> above 0.7 and a high significance (P &lt; 0.0001) for all categories, showing that the thoracic circumference may be a good indicator of body weight. In addition, a significant effect (P &lt; 0.05) of the relationship between thoracic circumference and prediction of animal’s body weight was verified using the models of linear, quadratic, and cubic regression. Among the models studied, the Gompertz model presented the best fit and biological interpretation. Furthermore, the Gompertz model indicated the need to separate animals by sex in order to properly meet nutritional requirements and determine adequate slaughter age. Thoracic circumference can be used to predict animal body weight with a high accuracy.

scholarly journals Growth curves in meat-type and laying quail: a Bayesian perspective

2017 ◽  
Vol 38 (4Supl1) ◽  
pp. 2743 ◽  
Author(s):  
Robson Marcelo Rossi ◽  
Daiane De Oliveira Grieser ◽  
Vagner De Almeida Conselvan ◽  
Simara Márcia Marcato
Keyword(s):  
Body Weight ◽  
Bayesian Approach ◽  
Goodness Of Fit ◽  
Nonlinear Models ◽  
Growth Curves ◽  
Gompertz Model ◽  
Body Growth ◽  
Coturnix Coturnix ◽  
Body Weight Data ◽  
Meat Type

The aim of this study was to assess the goodness of fit for nonlinear models, using the best model to describe body growth curves, comparing the parameters obtained for gender and one meat-type (Coturnix coturnix coturnix) and two laying (Coturnix coturnix japonica) quail strains, as well as nesting via MCMC (Markov chain Monte Carlo processes) methods under a Bayesian approach. A total of 1,350 one-day-old mixed quail were used: 400 of meat-type, 450 of yellow laying, and 500 of red laying strains distributed in a completely randomized design with three treatments (each treatment corresponded to one strain) and five replications. The experimental period consisted of 1 to 42 days of age. At 21 days of age, quail sexing was performed by means of sexual dimorphism, being individually identified at one day of age with numbered rings, allowing determining growth curves by gender. Birds were reared in a conventional system, fed ad libitum with diets formulated to meet nutritional requirements. Body weight was determined weekly and assessed using nonlinear models: Logistic, Brody, Von Bertalanffy, and Gompertz, whose parameters were estimated under a Bayesian approach via MCMC algorithm by means of BRugs package from the software R. DIC (Deviance Information Criterion) criterion was used to select the best nonlinear model, i.e. the lower the DIC value is, the better the model goodness of fit to the data. Gompertz model was better adjusted to the data regardless the gender or strain. Meat-type quail had the highest asymptotic weights and the highest age at which growth rate was maximum, followed by red and yellow strains. All nestings presented significant differences (p < 0.05) between gender for contrasted parameters. Meat-type, yellow, and red females presented values significantly (p < 0.05) higher for asymptotic weight (370, 203, and 215 g, respectively) when compared to males (274, 131, and 143 g, respectively), which were earlier in body growth. Gompertz model was better adjusted to body weight data of quail regardless the gender or strain and the Bayesian approach allowed obtaining accurate estimations. Meat-type strain presented the highest body asymptotic weight, followed by red and yellow laying strains. Females presented higher asymptotic weight than that found for males of their respective strains but were later in growth.

scholarly journals Growth Curves for Body Weight of the Laboratory Rat

1969 ◽  
Vol 22 (4) ◽  
pp. 1077 ◽  
Author(s):  
PJ Pahl
Keyword(s):  
Body Weight ◽  
Body Fat ◽  
Growth Rates ◽  
Growth Curves ◽  
Tail Length ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Second Stage ◽  
Weight Growth ◽  
Laboratory Rat

Body weight growth of rats, bred and reared in small cages, occurs in two main stages, which overlap to a degree. During the first stage, when rats develop to maturity, all parts of the animal (e.g. head, body, limbs, tail) grow, resulting in high relative growth rates. During the second stage, one of post-maturity growth, there is an increase in body weight, unaccompanied by corresponding significant changes in such measures as limb and tail length. It is thought that the increase in body weight during the second stage is due to an increase in body fat; however, further experimentation is required to verify this contention.

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