Type
masterThesis
Creator
Identifier
202249212
Title
Caracterização demográfica da raça suína Malhado de Alcobaça.
Contributor
Almeida, José Pedro Pestana Fragoso de
Carolino, Renato Nuno Pimentel
Carolino, Renato Nuno Pimentel
Subject
Consanguinidade
Fundadores e ascendentes
Intervalo de gerações
Suínos
Variabilidade genética
Inbreeding
Founders and ancestors
Generation Intervals
Swine
Genetic variabitity
Domínio/Área Científica::Ciências Agrárias
Fundadores e ascendentes
Intervalo de gerações
Suínos
Variabilidade genética
Inbreeding
Founders and ancestors
Generation Intervals
Swine
Genetic variabitity
Domínio/Área Científica::Ciências Agrárias
Date
2019-05-27T17:12:29Z
2019-05-27T17:12:29Z
2019
2019-05-27T17:12:29Z
2019
Description
A população Malhado de Alcobaça (MA) é uma raça suína autóctone portuguesa que pode ser encontrada predominantemente na região centro Oeste de Portugal. A população MA, conhecida historicamente como Porco Sintrão, Torrejano, da Granja, da terra, está atualmente distribuída por 7 explorações produtoras, com um efetivo reprodutor adulto de 191 fêmeas e 12 varrascos. Neste trabalho fez-se uma caracterização demográfica do MA com recurso a software próprio, tendo por base a informação contida no Livro Genealógica da raça, com o objetivo de avaliar o estado da diversidade genética e identificar os fatores que a possam de certa forma condicionar. A análise incidiu num total de 7872 animais, nascidos entre 1985 e 2017.
Avaliou-se a evolução do efetivo e dos criadores da raça, o grau de preenchimento das genealogias, o intervalo entre gerações, o tamanho efetivo da população, os fundadores e ascendentes e a consanguinidade e sua evolução. O grau de preenchimento da genealogia é bastante completo, em que 99,9% dos animais nascidos entre 2000 e 2017 têm progenitores conhecidos. O intervalo médio entre gerações estimado foi de 2,51 anos e o tamanho efetivo da população de 50,94 animais. Estimou-se para a população um número efetivo de fundadores (fe) e de ascendentes (fa) de 13,70 e 12,64, respetivamente, com 5 ascendentes responsáveis por 50% da variabilidade genética. Animais nascidos entre 2000-2017 têm uma consanguinidade média de 14%. O maior risco de perda de diversidade genética, resulta de um aumento acentuado do coeficiente de consanguinidade ao longo dos anos; porém, nos últimos anos estudados, verificou-se uma diminuição deste agravamento, provavelmente como resultado de um maior controlo dos emparelhamentos.
The Malhado de Alcobaça (MA) population is an autochthonous Portuguese swine breed that can be found predominantly in the central-western region of Portugal. The MA population, known historically as Porco Sintrão, Torrejano, from Granja, from the land, is currently distributed by 7 productive farms, with an adult reproducer effective of 191 sows and 12 boars. In this work a demographic characterization of the MA was made using its own software, based on the information contained in the Genealogical Book of the breed, with the objective of evaluating the state of genetic diversity and identifying the factors that may in some way condition it. The analysis included a total of 7872 animals born between 1985 and 2017. It was evaluated the breed’s effective and breeders evolution, the pedigree completeness, the generation intervals, the effective population size, the founders and ancestors, and the inbreeding and it’s evolution. The pedigree completeness is quite complete which 99,9% of the animals born between 2000 and 2017 has known progenitors. The estimated generation interval was 2,51 years and the effective population size was 50,94 animals. An effective number of founders (fe) and ancestors (fa) of 13,70 and 12,64, respectively, with 5 ancestors accounting for 50% of genetic variability, were estimated. Animals born between 2000-2017 have an average inbreeding of 14%. The greater risk of loss of genetic diversity results from a sharp increase in the inbreeding coefficient over the years; however, in the last years, there was a decrease of this aggravation, probably because of a greater control of the pairings.
The Malhado de Alcobaça (MA) population is an autochthonous Portuguese swine breed that can be found predominantly in the central-western region of Portugal. The MA population, known historically as Porco Sintrão, Torrejano, from Granja, from the land, is currently distributed by 7 productive farms, with an adult reproducer effective of 191 sows and 12 boars. In this work a demographic characterization of the MA was made using its own software, based on the information contained in the Genealogical Book of the breed, with the objective of evaluating the state of genetic diversity and identifying the factors that may in some way condition it. The analysis included a total of 7872 animals born between 1985 and 2017. It was evaluated the breed’s effective and breeders evolution, the pedigree completeness, the generation intervals, the effective population size, the founders and ancestors, and the inbreeding and it’s evolution. The pedigree completeness is quite complete which 99,9% of the animals born between 2000 and 2017 has known progenitors. The estimated generation interval was 2,51 years and the effective population size was 50,94 animals. An effective number of founders (fe) and ancestors (fa) of 13,70 and 12,64, respectively, with 5 ancestors accounting for 50% of genetic variability, were estimated. Animals born between 2000-2017 have an average inbreeding of 14%. The greater risk of loss of genetic diversity results from a sharp increase in the inbreeding coefficient over the years; however, in the last years, there was a decrease of this aggravation, probably because of a greater control of the pairings.
Access restrictions
openAccess
http://creativecommons.org/licenses/by/4.0/
http://creativecommons.org/licenses/by/4.0/
Language
por
Comments