Estimativas de parâmetros genéticos para características reprodutivas de suínos

Filho, R. A. Torres; Torres, R.A.; Lopes, Paulo Sávio; Pereira, Cláubia; Euclydes, Ricardo Frederico; Araújo, Cláudio Vieira de; Silva, M.A.; Breda, Fernanda Cristina

doi:10.1590/s0102-09352005000500014

Cited by 9 publications

(3 citation statements)

References 9 publications

(2 reference statements)

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“…Thus, it is expected that individual selection in sows would produce satisfactory genetic gains. The heritability value obtained here is higher than the one reported by Torres Filho et al (2005), who used a model that, in addition to the additive genetic effect, also took into account the maternal genetic and the common litter environmental effects, thus obtaining the heritability value of 0.34. Our result, however, is closer to that of Irgang (1985), who found an estimated heritability of 0.49 for the female's age at first farrowing.…”

Section: Discussioncontrasting

confidence: 64%

“…In this sense, Mrode (1996) pointed out that the inclusion of the common environmental effect in the model increases the accuracy in predicting the breeding values of the animals. Torres Filho et al (2005) stated that the estimate of the common litter environmental effect for a sow's age at first farrowing highlights the importance of its inclusion in genetic model for this trait, considering that it accounted for 11% of the total phenotypic variation.…”

Section: Discussionmentioning

confidence: 99%

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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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Section: Discussioncontrasting

confidence: 64%

Section: Discussionmentioning

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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“…Among reproduction traits, reproductive performance, especially the number of piglets per litter, is fundamental for the success of pig production, where the increase in prolificity reduces production costs (Barbosa et al, 2008). However, this trait is sex-limited and shows low heritability of about 0.10 (Chen et al, 2003) and 0.22 (Torres-Filho et al, 2005), which represents a strong candidate for marker-assisted selection. Concerning to litter size, two factors are intimately related, ovulation rate and embryo survival or mortality.…”

Section: Introductionmentioning

confidence: 99%

Differential expression of genes in follicular cells of swines

et al. 2010

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-The main purpose of the present study was to identify for candidate genes related to ovulation in swines.To do so, it was investigated in ovarian follicular cells through quantitative real-time PCR the differential expression of the following genes: steroidogenic acute regulator (STAR), GATA-binding protein 4 (GATA), prostaglandin F2α (PGF2α), progesterone receptor (P4R), follicle-stimulating hormone receptor (FSHR), and cytochrome P450 aromatase (CYP19).These genes encode hormone receptors (FSHR and P4R), hormone (PGF2α), steroidogenic proteins (STAR and CYP19) and transcription factor (GATA). Folicular cells were collected from sows with high and low number of piglets/litters during the follicular phase of the estrus cycle. There was difference in transcript abundance among low and high prolific sows for the STAR, GATA, PGF2α, P4R and CYP19 genes. For the FSHR gene, the fold change was not considered to be significantly different. Because in the present study only the transcript level of the above mentioned genes was analyzed, no inference can be made regarded to protein translation or activity. Therefore, gene sequence trials and other functional studies will be necessary to complement the present results, allowing a better understanding on biological complexity of these genes and their use as markers for prolificity in swines.Key Words: candidate gene, litter size, ovulation rate, pig production, quantitative real-time PCR Expressão diferencial de genes em células foliculares de suínosRESUMO -O objetivo neste trabalho foi identificar genes candidatos relacionados à ovulação em suínos. Para tanto, investigou-se a expressão diferencial dos genes STAR (steroidogenic acute regulator), GATA (GATA-binding protein 4), PGF2α (prostaglandin F2α), P4R (progesterone receptor), FSHR (follicle-stimulating hormone receptor) e CYP19 (cytochrome P450 aromatase) em células foliculares ovarianas por meio de reação em cadeia da polimerase em tempo real (qRT-PCR) quantitativo em tempo real. Esses genes codificam para receptores hormonais (FSHR e P4R) hormônio (PGF2α), proteínas esteroidogênicas (STAR e CYP19) e fator de transcrição (GATA). As células foliculares foram coletadas durante a fase folicular do ciclo estral de porcas com alto e baixo número de leitões/leitegada. Houve diferença na abundância de transcritos entre porcas com alta e baixa prolificidade para os genes STAR, GATA, PGF2α, P4R and CYP19. Para o gene do FSHR, a alteração na abundância dos transcritos não foi significativamente diferente. Considerando que foi analisado somente o nível de transcrição desses genes mencionados, não se pode fazer inferências com relação à tradução ou atividade proteica. Portanto, ensaios de sequenciamento gênico e outras análises funcionais serão necessários para complementar esses achados e possibilitar melhor entendimento da complexidade biológica desses genes e seu uso como marcadores para prolificidade em suínos.Palavras-chave: genes candidatos, ovulação, produção de suínos, PCR quantitativo em tempo real, tamanho...

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Reproductive parameters of wild boar (Sus scrofa) in three different parts of Germany

2007

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Recent increases in wild boar populations in central Europe necessitated an evaluation of the current reproductive performance of this species. During a 2-year study, samples of ovaries and uteri were taken from wild boars from areas in the (northern) state of Lower Saxony and the (more southern) Rhineland-Palatinate, Germany, in which wild boar have been vaccinated against classical swine fever (CSF) after several outbreaks of the disease. Serum samples were also analyzed to determine the prevalence of diseases that may influence pig reproduction and fertility. While there was a striking seasonality of reproductive performance, especially among older animals, mating was delayed in up to 15% of piglets and yearlings, leading to a second peak of farrowing from June to August. Depending on the area, between 60 and 70% of the piglets were most likely to become pregnant during the main period of reproduction, while another two thirds of the remaining individuals farrowed by the summer, which was the case in the mountainous areas. The arithmetic mean number of fetuses were 6.29 per piglet, 6.67 per yearling, and 7.64 per adult for wild boar in Eastern Lower Saxony; 4.58 per piglet and 4.63 per yearling and 6.56 per adult for wild boar in the Western Eifel and 4.77 per yearling and 6.50 per adult in the Palatine Forest, as the number of pregnant piglets has been too low to calculate an arithmetic mean in this area. The numbers of Lower Saxony wild boar fetuses per individual exceed previously known values. The results indicate that exogenous factors have a strong impact on both reproductive seasonality and the percentage of reproducing individuals in an age group. Ovulation rates, numbers of fetuses, and prevalence of pregnancies were found to be high among all age groups, while early onset of puberty and high pregnancy rates were typical of young animals (yearlings). The influence of some important reproductive diseases like Aujeszky's disease, Brucellosis, porcine reproductive and respiratory syndrome, porcine parvovirosis, and CSF on wild boar reproduction and fertility was tested and found to be at least of minor interest for the reproductive outcome of the species.

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Estimativas de parâmetros genéticos para características reprodutivas de suínos

Cited by 9 publications

References 9 publications

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

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

Differential expression of genes in follicular cells of swines

Reproductive parameters of wild boar (Sus scrofa) in three different parts of Germany

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