Analysis of inbreeding in a local herd of Duroc pigs

Inbreeding was analyzed for 2,345 performance-tested Duroc pigs born between 1992 and 1997 to five distinct families (lines) at Holiday Hills Stock and Breeding Farm in San Pedro, Laguna [Philippines]. A computer software using the Pattern Extraction and Recognition Language (PEARL) was developed to...

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Bibliographic Details
Main Authors Bondoc, O.L, Veluz, C.D, Pabico, J.P, Arganosa, V.G. (Philippines Univ. Los Banos, College, Laguna (Philippines). Animal Breeding Div.)
Format Conference Proceeding
LanguageEnglish
Published College, Laguna (Philippines) PSAS 1999
Subjects
ANIMAL PERFORMANCE
BREEDS (ANIMALS)
CERDO
DESEMPENO ANIMAL
EFFICACITE ALIMENTAIRE
EFICIENCIA DE CONVERSION DEL PIENSO
ENDOGAMIA
FEED CONVERSION EFFICIENCY
FILIPINAS
INBREEDING
PERFORMANCE ANIMALE
PERFORMANCE DE REPRODUCTION
PHILIPPINES
PORCIN
RACE (ANIMAL)
RAZAS (ANIMALES)
REPRODUCTIVE PERFORMANCE
REPRODUCTIVIDAD
SWINE
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Summary:Inbreeding was analyzed for 2,345 performance-tested Duroc pigs born between 1992 and 1997 to five distinct families (lines) at Holiday Hills Stock and Breeding Farm in San Pedro, Laguna [Philippines]. A computer software using the Pattern Extraction and Recognition Language (PEARL) was developed to calculate individual and average inbreeding coefficient following the tabular method of computing additive genetic relationships. Two hundred ten animals were found to be inbred (i.e. F sub x 0). The average inbreeding coefficient in the herd, however, was low (i.e. 0.48%). Regression of individual inbreeding coefficient on year of birth (i.e. rate of inbreeding per year) is 0.25 plus or minus 0.04% per year. Estimates of inbreeding were 0%, 0.05%, .15%, .91%, .94%, and .90% for 1992, 1993, 1994, 1995, 1996, and 1997, respectively. Family 705 had the highest average inbreeding coefficient (0.77%), while Family 701 has the lowest (0.28%). Gilts were found to have higher average inbreeding coefficient than boars (i.e. 48% vs. 0.37%). Correlation analyses showed no significant relationship (P0.05) between individual inbreeding coefficents and animal performance in terms of production (i.e. average daily gain, feed conversion ratio, and backfat thickness) and sow reproductive (i.e. litter size at birth and weaning) traits. Because of detrimental effects associated with inbreeding, it is recommended that local breeding herds of livestock be monitored on a regular basis for these parameters. Information on inbreeding and additive genetic relationships will also be especially useful in generating unbiased and accurate estimates of individual breeding values
Bibliography:2001100089
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