Genetics of growth in piglets and the association with homogeneity of body weight within litters

Canario, Laurianne; Lundgren, H.; Haandlykken, M.; Rydhmer, Lotta

doi:10.2527/jas.2009-2056

Cited by 42 publications

(40 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Table 2 shows that there is a positive correlation between NBA and CVBWT. This observation supports reports by Canario et al (2010), who suggested that variation in birth weight of litter mates could be owing to differences in litter size and uterine capacity, size of the placenta and interactions among these factors. The NBA for gilts was lower (P <0.05) than that for multiparous sows, except for those greater than parity 6 (Table 3).…”

Section: Figuresupporting

confidence: 81%

See 1 more Smart Citation

Variation in individual piglet birth weights in a Large White × Landrace sow herd

Zindove¹,

Dzomba²,

Kanengoni³

et al. 2014

SA J. An. Sci.

View full text Add to dashboard Cite

Within-litter birth weight variation in pigs is increasingly becoming important in influencing the profitability of pig enterprises. The objective of the study was to characterize within-litter birth weight variation in piglets from Large White × Landrace sows. The study was conducted using records from 1 768 litters collected between January 1998 and September 2010 from a pig herd in South Africa. The number of piglets born alive (NBA) ranged from three to 18. The mean within-litter birth weight coefficient of variation (CVBWT) was 17.6% and ranged from 0.47% to 50.7%. The distribution of CVBWT in the herd was positively skewed. CVBWT increased as NBA increased. Multiparous sows farrowed litters with higher CVBWT than gilts. To enhance profitability of pig enterprises, the selection for increased NBA should be followed by selection for decreased CVBWT.

show abstract

Section: Figuresupporting

confidence: 81%

“…The number of teats a sow has limits the number of piglets it can nurture to weaning. When a sow farrows more piglets in a litter than its number of teats, the excess piglets have to be fostered (Canario et al, 2010). To date, sows from most breeds exhibit NBA of over 12 (Umesiobi, 2009).…”

mentioning

confidence: 99%

Variation in individual piglet birth weights in a Large White × Landrace sow herd

Zindove¹,

Dzomba²,

Kanengoni³

et al. 2014

SA J. An. Sci.

View full text Add to dashboard Cite

show abstract

“…Hermesch et al (2001) and Kaufmann et al (2000) estimated lower direct heritabilities of BW in piglets using an animal model with direct and maternal effects. On the contrary, Canario et al (2010) reported higher heritability (0.32 ± 0.06) of BW in Landrace individual piglets with a low magnitude of permanent effects (0.007) of litters. In the present study, estimate of litter heritability (c 2 ) ranged from 0.34 ± 0.05 to 0.38 ± 0.03.…”

Section: Notementioning

confidence: 84%

Estimation of variance and genetic parameters for pre-weaning weights of individualLandrace X Desisynthetic piglets

Mondal

Kumar

Dubey

et al. 2014

Journal of Applied Animal Research

View full text Add to dashboard Cite

Variances and genetic parameters were estimated for birth weight (BW), 14 day body weight (14dW), 28 day body weight (28dW), 42 day body weight (42dW) and weaning weight or 56 day body weight (56dW) in the Landrace X Desi synthetic piglet population reared under sub-temperate agro climatic region of India. The data were analyzed using restricted maximum likelihood (REML) fitting six animal models with various combinations of direct and maternal effects. Estimates of genetic and permanent environmental correlations were obtained using bivariate analysis of an animal model and computed with the DFREML program. A log likelihood ratio test was used to select the most appropriate univariate model for each trait. The direct estimates of heritability were 0.43 ± 0.04, 0.31 ± 0.04, 0.35 ± 0.05, 0.40 ± 0.06, and 0.49 ± 0.06 for BW, 14dW, 28dW, 42dW, and 56dW, respectively and it increased with age from 14dW to 56dW. The permanent litter effect progressively decreased and was minimum at 56dW, ranged from 0.21 ± 0.06 to 0.34 ± 0.04. Further, maternal genetic heritability was the highest, ranging from 0.16 ± 0.07 (model 5) to 0.18 (model 6), at age of weaning and the lowest for BW, from 0.04 ± 0.03 (model 5) to 0.06 (model 6). The presence of permanent litter effect was more important since it increased the accuracy of last three models (models 4-6) significantly over the first three models (models 1-3) without permanent litter effect. The selection of 56dW would be more reliable for genetic progress rather than the selection of BW. The direct additive genetic correlation (r a ) between BW and 56dW was −0.158 ± 0.29 which revealed that higher BW may not result for favorable changes in weaning weights which was in contradiction to many earlier reports.

show abstract

“…06-0 . 11 (Damgaard et al, 2003 ;Wittenburg et al, 2008;Canario et al, 2010). In some older studies, ANOVA techniques were used to analyse within-family variances of dairy bulls with large offspring groups, and substantial differences between sires were found (Van Vleck, 1968 ;Clay et al, 1979).…”

Section: Empirical Evidence For Genetic Variation In Environmental Vamentioning

confidence: 99%

Genetic analysis of environmental variation

2010

View full text Add to dashboard Cite

SummaryEnvironmental variation (V E ) in a quantitative trait -variation in phenotype that cannot be explained by genetic variation or identifiable genetic differences -can be regarded as being under some degree of genetic control. Such variation may be either between repeated expressions of the same trait within individuals (e.g. for bilateral traits), in the phenotype of different individuals, where variation within families may differ, or in both components. We consider alternative models for defining the distribution of phenotypes to include a component due to heterogeneity of V E . We review evidence for the presence of genetic variation in V E and estimates of its magnitude. Typically the heritability of V E is under 10 %, but its genetic coefficient of variation is typically 20 % or more. We consider experimental designs appropriate for estimating genetic variance in V E and review alternative methods of estimation. We consider the effects of stabilizing and directional selection on V E and review both the forces that might be maintaining levels of V E and heritability found in populations. We also evaluate the opportunities for reducing V E in breeding programmes. Although empirical and theoretical studies have increased our understanding of genetic control of environmental variance, many issues remain unresolved.

show abstract

Genetics of growth in piglets and the association with homogeneity of body weight within litters

Cited by 42 publications

References 27 publications

Variation in individual piglet birth weights in a Large White × Landrace sow herd

Variation in individual piglet birth weights in a Large White × Landrace sow herd

Estimation of variance and genetic parameters for pre-weaning weights of individualLandrace X Desisynthetic piglets

Genetic analysis of environmental variation

Contact Info

Product

Resources

About