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      Parámetros genéticos para sobrevivencia al nacer en porcinos Translated title: Genetics parameters of survival at birth in pigs

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          Abstract

          Con la finalidad de estimar índices de herencia directos (h²d) y maternos (h²m), correlaciones genéticas entre efectos directos y maternos (r dm), heterosis y tendencias fenotípicas (Tf), genéticas (Tg) y ambientales (Ta), se analizaron 15308 registros de sobrevivencia de lechigadas al nacer, utilizando modelos lineales a través de dos metodologías: cuadrados mínimos (CM) y máxima verosimilitud restringida (REML). El modelo incluyó los efectos fijos: año y época de nacimiento, granja, número de parto, grupo racial de camada, las covariables: lechones nacidos vivos y peso de la camada al nacer, además de los efectos aleatorios de padre para CM y camada (directo) y madre (materno) para REML. Los análisis se realizaron por separado para razas blancas (RB = Large White, LW y Landrace, L) y razas de color (RC = Duroc, D y Hampshire, H). Los promedios no ajustados y ajustados resultaron en 94,53%, 93.54% para RB y 93.53%, 95.65% para RC. Los h²d utilizando CM y REML: 0.010 y 0.010; 0.004 y 0.010; 0.062 y 0.020; no estimable y 0.010 para LW, L, D y H, los h²m y r dm: 0.030 y 0.980; 0.020 y 0.950; 0.040 y 1.000, 0.070 y 1.000. La heterosis resultó estadísticamente no significativa (NS). Las Tg y Ta (P<0.01) corresponden a (0.580 y 0.684 en LW) y (-1.111 y 1.230 en L), las otras tendencias resultaron NS. Se concluye que las variaciones en la sobrevivencia de la población estudiada se deben en mayor proporción al ambiente y poco al efecto de los genes.

          Translated abstract

          Direct (h²d) and maternal (h²m) heritabilities, genetic correlation between direct and maternal effects (rdm) heterosis, phenotypic (Tf), genetic (Tg) and environmental (Ta) annual trends, were estimated using 15308 records of litter survival at birth (LSB), with two methodologies: Least Square (LS) and Restricted Maximum Likelihood (REML). The model included year and season of birth, farm, number of calving, litter breed group as fixed effects, number of piglets born alive and litter weight at birth as covariates. In addition, for LS sire, and for REML animal (direct) and dam (maternal) effects were included as random effects. The analyses were separated for white breeds (WB; Large White =LW and Landrace =L) and for color breeds (CB; Duroc = D and Hampshire = H). The adjusted and non-adjusted LSB averages were 94.53 and 93.54% for CB and 93.53 and 95.65% for WB. Estimates of h²d from LS and REML were 0.010, 0.010; 0.004, 0.010; 0.062, 0,020 and non-estimable, 0.010 for LW, L, D, and H, respectively. Estimates of h2m and rdm were 0.010, 0.98; 0.020, 0.95; 0.040, 1.000; and 0.07, 1.000 for LW, L, D, and H, respectively. There was not statistical evidence of heterosis for LSB. The Tg and Ta were 0.580 and 0.684 for LW, -1.11 and 1.230 for L, and were the only different from zero (P<0.01). The low estimates of heritabilities indicate that genetic effects are of little importance in comparison with the environmental effects for litter survival at birth in this swine population.

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          Most cited references11

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          Estimation of direct and maternal genetic (co) variances for survival within litters of piglets

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            Evaluation of piglet mortality in 28 two-breed crosses among eight breeds of pig

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              A manual for use of MTDFREML: A set of programs to obtain estimates of variance and covariances [Draft]

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                Author and article information

                Journal
                zt
                Zootecnia Tropical
                Zootecnia Trop.
                Instituto Nacional de Investigaciones Agricolas INIA, Maracay, Venezuela. (Maracay, Aragua, Venezuela )
                0798-7269
                April 2004
                : 22
                : 2
                : 191-200
                Affiliations
                [01] Maracay orgname1Universidad Central de Venezuela orgdiv1Facultad de Agronomía. orgdiv2Instituto de Producción Animal Venezuela Correo electrónico: r_galindezhotmail.com, martínezg@ 123456agr.ucv.ve.
                [02] orgname2Universidad Central de Venezuela. orgdiv1Facultad de Ciencias Veterinarias. Correo electrónico: omarverde@ 123456cantv.net
                Article
                S0798-72692004000200009 S0798-7269(04)02200209
                9e0eb519-28a0-49d2-a2ae-7649b3b5e4f9

                http://creativecommons.org/licenses/by/4.0/

                History
                : 2004
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 17, Pages: 10
                Product

                SciELO Venezuela

                Categories
                Artículos Científicos

                sobrevivencia al nacer,tendencias,Índice de herencia,annual trends,swine,genetic correlation,heritability,Litter Survival at birth,correlaciones genéticas,cerdos

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