Suitability of traits related to aggression and handleability for integration into pig breeding programmes: Genetic parameters and comparison between Gaussian and binary trait specifications
König von Borstel U
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Changes in husbandry systems as well as consumers’ increasing demands for animal welfare lead to increasing importance of traits such as handleability and aggressiveness in pigs. However, before using such novel traits for selection decisions, information on genetic parameters for these traits for the specific population is required. Therefore, weight gain and behaviour-related traits were recorded in 1004 pigs (814 Pietrain x German Landrace crossbred, 190 German Landrace purebred) at different ages. Behaviour indicators and tests were assessed and conducted, respectively under commercial farm conditions and included scoring of skin lesions (twice) and behaviour during backtests (twice), injections (once), handling (twice) and weighing (three times). Since behaviour scores often exhibit suboptimal statistical properties for parametric analyses, variance components were estimated using an animal model assuming a normal (Gaussian, GA; all traits) and additionally a binary distribution of variables (BI; using a logit-link function for all behaviour traits). Heritabilities for behavioural traits ranged from 0.02 ± 0.04 (finishing pig handling test; BI) to 0.36 ± 0.08 (backtest 2; GA) suggesting that some of the traits are potentially useful for genetic selection (e.g. finishing pig weighing test: h2 (GA) = 0.20 ± 0.07). Only minor differences were observed for results from binary and Gaussian analyses of the same traits suggesting that either approach might yield valid results. However, four-fold cross-validation using correlations between breeding values of a sub-set of animals for the sample trait finishing pig weighing score indicated slight superiority of the logit model (r = 0.85 ± 0.04 vs. r = 0.77 ± 0.03). Generally, only weak to moderate associations were found between behavioural reactions to the same test at different ages (rp ≤ 0.11 for weighing at different ages; rp = 0.30 but rg (GA) = 0.84 ± 0.11 for the backtests) as well as between reactions to different tests. Therefore, for inclusion of behaviour traits into breeding programmes, and considering high labour input required for some tests such as the backtest, it is recommended to assess behaviour during situations that are relevant and identical to practical conditions, while the use of indicator traits generally does not appear to be a very promising alternative.
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A principal component meta-analysis on multiple anthropometric traits identifies novel loci for body shape Ried JS; Jeff M J; Chu AY; Bragg-Gresham JL; van Dongen J; Huffman JE; Ahluwalia TS; Cadby G; Eklund N; Eriksson J; Esko T; Feitosa MF; Goel A; Gorski M; Hayward C; Heard-Costa NL; Jackson AU; Jokinen E; Kanoni S; Kristiansson K; Kutalik Z; Lahti J; Luan J; Mägi R; Mahajan A; Mangino M; Medina-Gomez C; Monda KL; Nolte IM; Pérusse L; Prokopenko I; Qi L; Rose LM; Salvi E; Smith MT; Snieder H; Stančáková A; Ju Sung Y; Tachmazidou I; Teumer A; Thorleifsson G; van der Harst P; Walker RW; Wang SR; Wild SH; Willems SM; Wong A; Zhang W; Albrecht E; Couto Alves A; Bakker SJ; Barlassina C; Bartz TM; Beilby J; Bellis C; Bergman RN; Bergmann S; Blangero J; Blüher M; Boerwinkle E; Bonnycastle LL; Bornstein SR; Bruinenberg M; Campbell H; Chen YI; Chiang CW; Chines PS; Collins FS; Cucca F; Cupples LA; D'Avila F; de Geus EJ; Dedoussis G; Dimitriou M; Döring A; Eriksson JG; Farmaki AE; Farrall M; Ferreira T; Fischer K; Forouhi NG; Friedrich N; Gjesing AP; Glorioso N; Graff M; Grallert H; Grarup N; Gräßler J; Grewal J; Hamsten A; Harder MN; Hartman CA; Hassinen M; Hastie N; Hattersley AT; Havulinna AS; Heliövaara M; Hillege H; Hofman A; Holmen O; Homuth G; Hottenga JJ; Hui J; Husemoen LL; Hysi PG; Isaacs A; Ittermann T; Jalilzadeh S; James AL; Jørgensen T; Jousilahti P; Jula A; Marie Justesen J; Justice AE; Kähönen M; Karaleftheri M; Tee Khaw K; Keinanen-Kiukaanniemi SM; Kinnunen L; Knekt PB; Koistinen HA; Kolcic I; Kooner IK; Koskinen S; Kovacs P; Kyriakou T; Laitinen T; Langenberg C; Lewin AM; Lichtner P; Lindgren CM; Lindström J; Linneberg A; Lorbeer R; Lorentzon M; Luben R; Lyssenko V; Männistö S; Manunta P; Leach IM; McArdle WL; Mcknight B; Mohlke KL; Mihailov E; Milani L; Mills R; Montasser ME; Morris AP; Müller G; Musk AW; Narisu N; Ong KK; Oostra BA; Osmond C; Palotie A; Pankow JS; Paternoster L; Penninx BW; Pichler I; Pilia MG; Polašek O; Pramstaller PP; Raitakari OT; Rankinen T; Rao DC; Rayner NW; Ribel-Madsen R; Rice TK; Richards M; Ridker PM; Rivadeneira F; Ryan KA; Sanna S; Sarzynski MA; Scholtens S; Scott RA; Sebert S; Southam L; Sparsø TH; Steinthorsdottir V; Stirrups K; Stolk RP; Strauch K; Stringham HM; Swertz MA; Swift AJ; Tönjes A; Tsafantakis E; van der Most PJ; van Vliet-Ostaptchouk JV; Vandenput L; Vartiainen E; Venturini C; Verweij N; Viikari JS; Vitart V; Vohl MC; Vonk JM; Waeber G; Widén E; Willemsen G; Wilsgaard T; Winkler TW; Wright AF; Yerges-Armstrong LM; Hua Zhao J; Carola Zillikens M; Boomsma DI; Bouchard C; Chambers JC; Chasman DI; Cusi D; Gansevoort RT; Gieger C; Hansen T; Hicks AA; Hu F; Hveem K; Jarvelin MR; Kajantie E; Kooner JS; Kuh D; Kuusisto J; Laakso M; Lakka TA; Lehtimäki T; Metspalu A; Njølstad I; Ohlsson C; Oldehinkel AJ; Palmer LJ; Pedersen O; Perola M; Peters A; Psaty BM; Puolijoki H; Rauramaa R; Rudan I; Salomaa V; Schwarz PE; Shudiner AR; Smit JH; Sørensen TI; Spector TD; Stefansson K; Stumvoll M; Tremblay A; Tuomilehto J; Uitterlinden AG; Uusitupa M; Völker U; Vollenweider P; Wareham NJ; Watkins H; Wilson JF; Zeggini E; Abecasis GR; Boehnke M; Borecki IB; Deloukas P; van Duijn CM; Fox C; Groop LC; Heid IM; Hunter DJ; Kaplan RC; McCarthy MI; North KE; O'Connell JR; Schlessinger D; Thorsteinsdottir U; Strachan DP; Frayling T; Hirschhorn JN; Müller-Nurasyid M; Loos RJ (2016)Large consortia have revealed hundreds of genetic loci associated with anthropometric traits, one trait at a time. We examined whether genetic variants affect body shape as a composite phenotype that is represented by a ...