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Iowa State University

1997

Animal Science Publications

Reproductive Performance

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Maternal Performance Differences Between Porcine Stress Syndrome-Normal And -Carrier Landrace Females, Kenneth J. Stalder, L. L. Christian, Max F. Rothschild, E. C. Lin Jan 1997

Maternal Performance Differences Between Porcine Stress Syndrome-Normal And -Carrier Landrace Females, Kenneth J. Stalder, L. L. Christian, Max F. Rothschild, E. C. Lin

Animal Science Publications

Differences between porcine stress syndrome (PSS) normal (NN) and carrier (Nn) Landrace dams were determined for adjusted number of pigs born alive, adjusted number of pigs at 21 d, adjusted 21-d litter weight, proportion of pigs surviving to 21 d, and farrowing interval. Data were analyzed from a total of 841 females, 623 normal (NN) and 218 carriers (Nn) having 2,231 and 869 records, respectively. Three susceptible (nn) females from two herds were dropped from the analysis because of their small contribution to the total number of records. Frequency of the recessive PSS allele ranged from .07 to .28 ...