Efeitos genéticos e não-genéticos sobre o intervalo de parto em fêmeas suínas no Sudeste do Brasil

Neto, Aderson Costa Araujo; Lui, Jeffrey Frederico; Sarmento, José Lindenberg Rocha; Ribeiro, Maria Norma; Monteiro, John M.; Fonseca, Carlos; Tonhati, Humberto

doi:10.1590/s0102-09352009000100040

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…Environmental and genetic factors may influence reproductive and productive traits of swine (Cavalcante-Neto et al, 2008a, 2009a. The WEI is usually associated with parity number, estrus length, the time of ovulation, and previous litter size (Karveliene et al, 2008;Cavalcante-Neto et al, 2008b), and it may be also influenced by other environmental factors such as season, temperature, photoperiod, nutrition, stress, age of the sow, management practices, genetic, among others (Antunes, 2007;Lundgren et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Environmental and genetic factors affecting the weaning-estrus interval in sows

Leite

Lui²,

Albuquerque³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. We examined the effects of environmental and genetic factors on the weaning-to-estrus interval (WEI) in sows. In order to perform the analyses of the environmental factors, 8104 observations of the 1st to the 6th WEI were carried out, while 6548 observations of the 1st to the 3rd WEI were carried out for the analyses of genetic factors. The environmental model included as fixed effects, herd, genetic line, year and season of birth, as well as the covariates, age of sow at farrowing, litter size at birth and lactation length. Genetic analysis was performed by repeatability and multitrait models. The mean and coefficient of variation for WEI were 7.02 days and 100.6%, respectively. The linear effect of lactation length and the quadratic effect of the age of sow at farrowing affected the WEI. Herd, year and season of farrowing were significant sources of variation for WEI, and there was no influence of genetic line or of litter size at birth. Heritability estimated by the repeatability model was 0.04, while heritabilities obtained by the multitrait model were Factors affecting the weaning-estrus interval in sows 0.07, 0.02 and 0.07 for the first three WEI, respectively. Estimates of genetic correlations among the different WEI were of moderate to low magnitude. It was concluded that environmental factors, such as year and season of farrowing, lactation length, age of sow at farrowing and herd, should be considered in the model for best estimation of genetic parameters for this trait. Although with only a small possible genetic gain, selection can be made based on the first WEI.

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Section: Introductionmentioning

confidence: 99%

Environmental and genetic factors affecting the weaning-estrus interval in sows

Leite

Lui²,

Albuquerque³

et al. 2011

Genet. Mol. Res.

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“…Knowledge of the influence of environmental and genetic factors on these traits is becoming increasingly important (Cavalcante-Neto et al, 2009a;Leite et al, 2011), considering the geographic dimensions of Brazil, with regions of different climates, not to mention deficient management, inadequate facilities, and animals that are not always of high breeding value (Pinheiro et al, 2000;Cavalcante-Neto et al, 2008a, 2009b.…”

Section: Introductionmentioning

confidence: 99%

Genetic and environmental effects on age at first farrowing in sows in southeastern Brazil

Cavalcante-Neto¹,

Lui²,

Sarmento³

et al. 2011

Genet. Mol. Res.

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ABSTRACT. We evaluated genetic and environmental factors affecting age at first farrowing of sows in the Brazilian southeast. For this purpose, 466 observations regarding the age at first farrowing were made for Dalland-C40 © animals belonging to two herds. The effects of the environmental factors on this trait were assessed by means of a model that included, as random effects, the influence of the sow's father and mother and, as fixed effects, the influence the year of birth, the herd and the birth season, along with the covariable litter size at birth. The variance components were estimated using the derivative-free restricted maximum likelihood method. The estimated mean was 354.8 ± 25.87 days, with a coefficient of variation of 7.29%. Significant effects on the trait were observed for the herd, the year and the season of birth; Genetic and environment effects on age at first farrowing but a linear effect of litter size at birth on the age at first farrowing was not observed. The boar did not significantly contribute to the variation occurring among the sows, whereas the sow's mother caused significant variation. The heritability estimate for the age at first farrowing was 0.44 ± 0.15, which is considered high. We concluded that herd effect and year and season of birth should be taken into consideration for an accurate genetic comparison; consequently, the animals should be joined into contemporary groups.

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“…Igualmente, Díaz et al (2011) reportaron un peso promedio al destete de 6.09 kg (22 días) por lechón. La disminución en la fase de lactancia se ha obtenido con el mejoramiento de las técnicas de sanidad, nutrición y manejo, que buscan beneficiar a la cerda hasta que adquiera el máximo de producción de leche, lo que permite aumentar la producción de la piara (Díaz et al, 2011;Cavalcante-Neto et al, 2009).…”

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Evaluación del aumento de peso en lechones durante la lactancia en parideras tecnificadas y tradicionales

2019

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El objetivo de este trabajo fue evaluar el aumento de peso en lechones durante la lactancia en parideras tecnificadas y tradicionales. La investigación se realizó en las instalaciones de la Granja Experimental Bengala de la Universidad del Quindío, ubicada en el municipio de Filandia, a 2050 metros de altitud, donde se estimó la ganancia de peso de 53 lechones de cerdas landrace, alojados en parideras tradicionales y tecnificadas con planchas de calentamiento previamente desinfectadas. Durante la etapa de destete (21 días), el manejo para ambos tratamientos fue semejante, lo que implicó manipular la temperatura dentro de las parideras para mantener el calor corporal de los neonatos porcinos. Se registraron los pesos desde su nacimiento hasta terminar la etapa de destete, se empleó un diseño completamente al azar. El análisis de varianza mostró que ningún valor-P es menor que 0,05; por tanto, ninguno de los factores tiene un efecto estadísticamente significativo sobre el peso con un 95.0 % de nivel de confianza. El promedio general desde el nacimiento hasta el destete (21días) en parideras tecnificadas está en 6400 g/lechón, lo que indica que el aumento semanal de los lechones en jaulas tecnificadas se encuentra en un promedio de 1300 g, mientras que el aumento de los lechones nacidos en parideras no tecnificadas o tradicionales es, en promedio, de 1200 g semanales.

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Efeitos genéticos e não-genéticos sobre o intervalo de parto em fêmeas suínas no Sudeste do Brasil

Cited by 4 publications

References 17 publications

Environmental and genetic factors affecting the weaning-estrus interval in sows

Environmental and genetic factors affecting the weaning-estrus interval in sows

Genetic and environmental effects on age at first farrowing in sows in southeastern Brazil

Evaluación del aumento de peso en lechones durante la lactancia en parideras tecnificadas y tradicionales

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