Skull shape in relation to carcass fatness in pigs

Gregory, N.; Whelehan, O. P.

doi:10.1002/jsfa.2740341213

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The correlated response on mandible dimensions of selection for extent of fatness has been documented in detail here. Similarly, Gregory and Whelehan (1983) and Whelehan and Gregory (1985) examined skull shape in relationship to fatness in pigs. Genetic selection for improved production performance, as defined by decreased fatness and increased efficiency of food conversion and growth rate, led to divergence in skull shape between the selected and control lines.…”

Section: Discussionmentioning

confidence: 99%

Correlated Response in the Developmental Choreographies of the Mouse Mandible to Selection for Body Composition

et al. 1990

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The correlated response to 13 generations of selection for percent fatness and leanness is investigated in 11 mandible traits in mice. Five selection lines are examined including high fat (HF), low fat (LF), high lean (HL), low lean (LL) and a randomly selected control strain (RC. The ontogenetic patterns of growth in the RC strain serve as a model to evaluate the developmental consequences of directional selection. Selection has systematically altered the patterns of mandible growth in selection lines relative to the control strain. Further, selection has significantly altered the age-specific phenotypic covariance among these traits. In the HF strain, growth in the mandible is completed by 12 weeks of age for most traits. In other selected strains, notably LF and LL, there is a significant growth spurt that occurs between 12 and 15 weeks of age. Changes in the patterns of mandibular growth produce significant differences among strains in the final form of the mandible. Because of the changes in the patterns of growth, the differences among strains are themselves shown to vary at different postnatal ages. The phenotypically similar strains, i.e., HF and LL or LF and HL, show different but correlated patterns of divergence. Multivariate statistical analyses suggest that the temporal strain differences in these traits are multidimensional.

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Section: Discussionmentioning

confidence: 99%

Correlated Response in the Developmental Choreographies of the Mouse Mandible to Selection for Body Composition

et al. 1990

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“…Hu et al (2006) та R. Ros-Freixedes et al (2014). Також АГК активно використовувався при дослідженні лінійних промірів тіла (Van Steenbergen, 1989), краніометричних ознак (Gregory and Whelehan, 1983), ростових процесів на різних етапах відгодівлі (Okoro et al, 2015), етологічних характеристик свиней (Czycholl et al, 2017) та ін. Також є приклади вдалого використання АГК при дослідженні особливостей мінливості відтворювальних ознак свиноматок (Young et al, 1977;1978).…”

Section: таблицяunclassified

A comparative study of the reproductive traits and clustering analysis among different pig breeds

et al. 2018

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The data were from 149 pigs from seven pig genetic groups raised in «Tavriys'ki Svyni» Ltd (Kherson region, Ukraine). The following genetic groups were included in our analyses: LW × LW (n = 19), LW × LN (n = 43), LW × PT (n = 13), LN × LN (n = 15), UM × LN (n = 23), UM × PT (n = 17) and UM×UM (n = 16). The objective this work was evaluation of animal reproductive traits using multivariate analysis. Variables measured and derived included total no. piglets born (TNB), no. piglets born alive (NBA), freq. of stillborn piglets (FSB), total litter birth weight (TLBW), average piglet birth weight (APBW), pre-weaning mortality in piglets (PWM), no. weaned piglets (NW), total weaning weight of litter (TWWL) and average piglet weaning weight (APWW). After standardization, multivariate analyses (Cluster analysis and Principal Component Analysis) were carried out using STATISTICA (StatSoft Ltd.) to place pig interbreeding combinations in groups in accordance with their degree of similarity and verify discriminatory capacity of the original traits in the formation of these groups. The tree diagram showed clear distances between the pig genetic groups studied. In the tree diagram obtained from the analysis of the distances between interbreeding combinations, two distinct groups (clusters) were seen, one with UM × LN and UM × UM animals, and the other with the rest of the pig genetic groups in the study. The eigenvalues for the first two Principal Components (PC1 and PC2) together accounted for near 65% of the variance of the pig’s reproductive traits. The first principal component (PC1) explained 34.9% total variation. It was represented by significant positive loadings for TNB, NBA and TLBW. The second principal component (PC2) accounted for an additional 29.7% of the generalized variance and was represented by significant loadings for NW, TWWL and APWW. Thus, PC1 defined no. piglets and total litter birth weight, while PC2 represented no. weaned piglets and total weaning weight of litter. In conclusion, the multivariate methods (Cluster Analysis and PCA) has been proven to be a very effective method to obtain a synthetic judgment of reproductive traits in pig.

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Further studies on skull shape in relation to carcass fatness in pigs

Whelehan

Gregory

1985

J Sci Food Agric

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The relationships between skull shape and carcass fatness were examined in 27 pigs from a genetic selection study using 16 linear skull measurements, ten measurements of carcass fat weight and six measurements of backfat thickness. The most variable index of skull shape was derived by principal components analysis and contrasted long and narrow skulls with short and broad ones. Correlations showed that short broad skulled pigs tended to be leaner than long narrow skulled pigs confirming an earlier study. Genetic selection for improved production performance led to divergence in skull shape between the selected and control lines. The use of skull shape in assessing carcass composition is discussed.

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Skull shape in relation to carcass fatness in pigs

Cited by 3 publications

References 5 publications

Correlated Response in the Developmental Choreographies of the Mouse Mandible to Selection for Body Composition

Correlated Response in the Developmental Choreographies of the Mouse Mandible to Selection for Body Composition

A comparative study of the reproductive traits and clustering analysis among different pig breeds

Further studies on skull shape in relation to carcass fatness in pigs

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