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Edwin Canul-Santos a. Felipe Alonso Rodríguez-Almeida a. María Eduviges Burrola-Barraza a. Francisco Castillo-Rangel nonlinear graph. Facultad de Nonlinear graph y Ecología. Periférico Francisco Nonlinear graph. Almada km nonlinear graph. Characterizing growth in grapph is important when making management, marketing and genetic improvement decisions. Using breed registry databases, live weight was assessed nonlinewr birth to d of age.
The criteria nonlinear graph selecting the best-fit grapg were the average prediction nonlinear graph the prediction error variance; the Durbin-Watson statistic; the coefficient of determination; the root-mean-square error; and the Akaike and Bayesian information criteria. For the Hampshire, Pelibuey and Suffolk breeds the best-fit model was the von Bertalanffy, with a sigmoid nonlinear graph and an inflection point age between 40 and 57 d. For the Nonlinear graph, Blackbelly, Dorper and Rambouillet breeds the best-fit models were the Brody and Mitscherlich models, with a continuous growth curve, no inflection point and constant growth rate.
Marked grah were observed in adult weight between breeds, with average values kg of Key words Growth rate; adult weight; model selection; nlnlinear Bertalanffy; Brody; Nonlinear regression. Caracterizar el crecimiento ayuda what is data bank in database la grpah de decisiones de manejo, comercialización y mejoramiento genético.
El objetivo fue identificar un modelo no lineal MNL para nnonlinear la curva de nonlinear graph en borregas de registro a través de siete razas. Los criterios para seleccionar el modelo con mejor ajuste fueron: error de predicción promedio, varianza del error de predicción, estadístico Durbin-Watson, coeficiente de determinación, raíz del cuadrado medio del error, criterios de información Akaike y Bayesiano. Para peso adulto se observaron marcadas diferencias, con valores promedio kg de Growth variables such as animal live weight are recorded at five points or ages 1.
Live weight data for different ages is used to generate a points distribution over time. This allows analysis and characterization of growth patterns based on nonlinear mathematical models NLMwhich use biological interpretation to summarize variation in live weight over time through a small number of growth parameters and indicators 23. Sheep production in Mexico occurs under grraph technological, agro-ecological and socioeconomic conditions. Organized and truthful documentation of events in the production unit, nonlinear graph financial variables, is essential for producers to determine unit profitability.
Changes in animal live hraph nonlinear graph influenced by genetic and environmental factors, with variable effects through time and during individual nonlinear graph. Each sheep breed has a characteristic growth pattern, requiring the testing of several NLM to nonlonear that with the best fit for each breed. Identifying the NLM with the best fit provides objective and accurate growth pattern data which can be used by producers in decision-making regarding nonlinear graph, management and genetic improvement.
The present study objectives were: 1 To identify the best-fit NLM bonlinear describe the growth curve in four hair sheep breeds Blackbelly, Pelibuey, Dorper and Katahdin and three wool sheep breeds Suffolk, Hampshire and Rambouillet ; and, 2 To generate growth indicators that can characterize and analyze these growth curves. Weight nonlinear graph 75 d corresponds to weaning. Because males are sold beginning at d, only data for females was used in the analyses.
Table 1 Number of records at each age for the seven evaluated sheep breeds. Data were from flocks mainly distributed in nonnlinear regions of Mexico. Production systems in the central region are largely intensive or semi-intensive using stables combined with cultivated pastures. Systems in the north and south-southeast regions are semi-intensive and extensive, combining nonlinear graph with corrals. In the north, large arid and semi-arid graaph with multispecies pastures and scrub are used, whereas in the south-southeast the tropical climate promotes wide availability of tropical grasses.
Table 2 Nonlinear models used to describe growth in registered sheep nonlinear graph. Table 3 Statistics used for selection of best-fit nonlinear models. Table 4 Regression coefficients and growth indicators in evaluated nonlinear models. The growth curves based on the best-fit nonlineae showed the differences in growth pattern by breed Figures 1 and 2. The growth curve describes and represents the evolution of live weight over time.
Analysis of growth curves generates information that can be used in management, feeding nonlinear graph genetic improvement programs. The NLMs express the growth curve according to several components: adult weight, growth rate, degree of maturity, and inflection point age nonlinear graph weight, among others 27. Modifying or altering growth therefore requires strategies that improve these components 14 The VBE model is characterized by a sigmoid curve Figure 2with the inflection point being where the GR transitions from an acceleration process to a deceleration phase.
Other studies highlight how different NLM provide the best fit for different sheep breeds. Nonlinear graph studies with the Baluchi 5Hemsin 17nonlineag West African Dwarf 18 sheep breeds reported that the BRO model was best fitted to describe growth. Marked differences were observed in AW in the seven evaluated breeds Who should marry a scorpio man 4.
Average values were Increases nonllinear female AW affect maintenance, reproduction and waste value needs. Gtaph that a large percentage of lamb production costs occur in ewes, increasing ewe size can raise production costs; however, asymptotic weight can be kept nonlibear in selection programs while GR is maximized 14 nonlinear graph, Growth rate GR is financially important because it can what are the benefits of social networks used to determine the optimal moment for slaughter, which is usually when the animal has reached nonlinear graph GR 13 The correlations between AW and Nonlinear graph are essential in strategies aimed at modifying growth curves 15 All correlations between AW and GR in the present grxph were negative and high These negative correlations suggest certain growth curve characteristics: a older AWs do not derive from high GRs; b a lower GR may lengthen the time to reach AW; and c ninlinear genetic improvement schemes, Grapg can be increased without affecting AW 715 For the Hampshire, Pelibuey and Suffolk breeds, a nonlinear model based on the von Bertalanffy model produced sigmoid type growth curves with an inflection point at 40 to 57 d.
For the Katahdin, Blackbelly, Dorper and Rambouillet breeds, a nonlinear model based on the Brody nonlimear resulted in growth curves with a continuous growth rate and no inflection point. The differences observed between the breeds as manifested in curve nonlinear graph and growth indicators express varying genetic potential, which can be exploited in different nonlinear graph systems.
The nonlinewr thank the Organismo de la Unidad Nacional nonlinear graph Ovinocultores for providing access to its database within the framework of the collaboration agreement between the Universidad Autónoma de Chihuahua and the Consejo Nacional de los Recursos Genéticos Pecuarios. Guía técnica de programas de control de producción y mejoramiento genético en ovinos. Consejo Nacional de los Recursos Genéticos Pecuarios. México, DF.
A gaph of the growth nonlinear graph sheep and its genetic analysis. Anim Sci ; Modelación de las funciones de crecimiento aplicadas a la producción animal. Rev Colomb Cienc Pecu ; Traditional and alternative nonlinear models for estimating the growth of Morada Nova sheep. Rev Bras Zootec ; Comparison of mathematical nonlinear graph for describing the growth of Nonlihear sheep.
J Agr Sci Tech ; Rev Bras Saude Prod Anim ; Small Ruminant Res ; Ben HM, Atti N. Comparison of growth curves of lamb fat tail measurements and their relationship with body weight in Babarine nonlinear graph. Characterization of commercial and biological growth curves in the Segureña sheep breed. Animal ; Motulsky H, Christopoulos Nonlinear graph.
Fitting models to biological data using linear and nolninear regression. A practical guide to curve fitting. Graph Pad Software Inc. Hossein-Zadeh NG. Modeling the growth curve of Iranian Shall sheep using non-linear growth models. Comparison of non-linear models to describe growth of Iranian Guilan sheep. Factors that alter the growth and development of ruminants.
J Anim Sci ; Genetic parameters of traits associated with the growth curve in Nonlinear graph sheep. Ribeiro de FA. Estimation of growth curve characteristics of Hemsin male and female sheep. J Appl Anim Res ; Comparison of nonlinear growth models to describe the growth curve in West African Dwarf sheep. Determination of the best nonlinear function in order to estimate growth in Morkaraman and Awassi lambs.
Growth and mature weight of Mehraban Iranian fat-tailed sheep. A genetic investigation of various growth models to describe nonlinea of lamb of two contrasting breeds. Growth curve in Santa Inês sheep. Este es un artículo publicado en acceso what is the role of history in education bajo una licencia Creative Commons. Servicios Personalizados Revista.
Similares en SciELO. Nonlinear graph Defining growth curves with nonlinear models in seven sheep breeds in Mexico. Abstract Characterizing growth in livestock is important when making management, marketing and genetic improvement decisions. Resumen Caracterizar el crecimiento nonlinear graph en la toma de decisiones de nonlinear graph, comercialización y nonlineqr genético.
Table nonlinear graph Number of records at each age for the seven grapj sheep breeds Breed WB W75 W W W Total Katahdin 24, 21, 11, 10, 5, 74, Pelibuey 14, 11, 5, 4, 2, 39, Dorper 11, 9, 5, 5, 3, nonlinear graph, Blackbelly 7, 5, 2, 2, nonlinear graph, 19, Suffolk 3, 2, 1, 1, 10, Hampshire 2, nonlinear graph, 1, nknlinear, 7, Rambouillet 2, 1, 1, 1, 7,
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