Data/hora: 13/06/2024 02:22:55

Provedor de dados: 	96	
País: 	Brazil	
Título: 	Evaluation of a dynamic simulation model for milk production systems	
Autores: 	Cunha,Daniel de Noronha Figueiredo Vieira da; Pereira,José Carlos; Campos,Oriel Fajardo de; Braga,José Luis; Silva,Fabyano Fonseca e; Martuscello,Janaina Azevedo.	
Data: 	2010-04-01	
Ano: 	2010	
Palavras-chave: 	Dairy cattle; Modeling.	
Resumo: 	The objective of this study was to develop and to evaluate a dynamic simulation model, with stochastic components in order to assess milk production systems. The simulation model was developed by using STELLA 9.0, ZooCalc 1.0 and electronic data sheets. The physical structure of the herd was divided into 15 interlinked modules that represented categories or subdivisions of categories. Mathematical models obtained from the literature were used to simulate the body weight of growing and lactating animals and milk production and milk composition. Electronic data sheets were used to calculate the nutritional requirements and dietary balance. After cost minimization, each feed was evaluated by using ZooCalc 1.0. Some average responses of farm size, zootechnical and economic index, the change in the area used for com silage production, the calving interval and age at first insemination were obtained to evaluate whether the simulation model was working consistently with the expected. To assess the capacity of the model to gene rate simulated values that approach reality, the degree of linear association was measured between the values generated by the model and the values observed in practice. Sensitivity analyses showed that the values produced by the simulation model were in agreement with the expected results, in response to changes in the area of com crop used for com silage production, the calving interval and the age at first insemination. There was correlation between the values generated by the simulation model and the values observed in practice and the degree of linear association for the variables could be considered high.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000400027	
Editor: 	Sociedade Brasileira de Zootecnia	
Relação: 	10.1590/S1516-35982010000400027	
Formato: 	text/html	
Fonte: 	Revista Brasileira de Zootecnia  v.39 n.4 2010	
Fonte: 	info:eu-repo/semantics/openAccess