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Caracterização das curvas de crescimento do ovino Segurenho em sistemas convencionais e biológicos.
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Abstract(s)
No presente trabalho analisaram-se modelos não lineares para descrever as curvas de crescimento biológico (do nascimento à idade adulta) e comercial (do nascimento ao sacrifício) da raça ovina Segureña, uma das
mais importantes de Espanha. Foram avaliados os modelos de Brody, von Bertalanffy, Verhulst, Gompertz e logístico, utilizando dados entre os anos de 2000 a 2015, da base de dados da Asociación Nacional de Criadores de Ovino Segureño (ANCOS). Foi levado a cabo um estudo para avaliar os efeitos não genéticos (sexo, época de nascimento, rebanho, ano de nascimento e tipo de parto) sobre o comportamento do crescimento dos animais. Foi estudada a importância genética dos parâmetros das curvas de crescimento e a sua importância como critério de selecção nos programas de melhoramento dos ovinos Segureños.
Os resultados obtidos estruturam-se em 3 trabalhos que deram lugar a 3 publicações
The sheep breeding program of Segureño breed has reached a great development in recent years, ranking among the most advanced in Spain and EU. For this reason, its responsible technical team has considered the search for new selection criteria which influence the competitiveness of the breed, in which emphasizes the use of the biological meaning of the best fit growth curve, as selection criteria to improve aspects such as age at slaughter, precocity, among others. Using data between the years 2000-2015 of the historical database of the National Association of Segureño Sheep Breeders (ANCOS), we developed a study in three stages that lead us to offer the aforementioned new criteria to the genetic program. In a first stage, it was analysed nonlinear models describing biological (birth to adulthood) and commercial (birth to slaughter age) growth curves of Segureña sheep breed. In a second stage a study was conducted to evaluate the effects of non-genetic factors (sex, birth season, herd, birth year and birth type) on the growth behaviour of the animals in order to optimize the genetic analysis models to use of on the curves parameters. Finally, in a third stage it was defined the individual best fit curve and with each animal parameters it was calculated the genetic parameters that illustrated us on genetic variability levels of them in the population, on genetic relationships between parameters and, above all, on their abilities as potential selection criteria. These three stages constitute the specific objectives of this study, and each led to a specific article published in journals of impact.
The sheep breeding program of Segureño breed has reached a great development in recent years, ranking among the most advanced in Spain and EU. For this reason, its responsible technical team has considered the search for new selection criteria which influence the competitiveness of the breed, in which emphasizes the use of the biological meaning of the best fit growth curve, as selection criteria to improve aspects such as age at slaughter, precocity, among others. Using data between the years 2000-2015 of the historical database of the National Association of Segureño Sheep Breeders (ANCOS), we developed a study in three stages that lead us to offer the aforementioned new criteria to the genetic program. In a first stage, it was analysed nonlinear models describing biological (birth to adulthood) and commercial (birth to slaughter age) growth curves of Segureña sheep breed. In a second stage a study was conducted to evaluate the effects of non-genetic factors (sex, birth season, herd, birth year and birth type) on the growth behaviour of the animals in order to optimize the genetic analysis models to use of on the curves parameters. Finally, in a third stage it was defined the individual best fit curve and with each animal parameters it was calculated the genetic parameters that illustrated us on genetic variability levels of them in the population, on genetic relationships between parameters and, above all, on their abilities as potential selection criteria. These three stages constitute the specific objectives of this study, and each led to a specific article published in journals of impact.
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Citation
LUPI, T.M. (2018) - Caracterização das curvas de crescimento do ovino Segurenho em sistemas convencionais e biológicos. In Ciclo de Conferências do Conselho Técnico-Científico : temas atuais em investigação, 4, Castelo Branco : IPCB.
Publisher
Instituto Politécnico de Castelo Branco.