Within-herd evaluation of sow reproductive traits

Low reproductive performance and high sow mortality in a pig breeding herd: a case study

Sow performance is a key component of the productivity of commercial pig farms. Reproductive failure in the sow is common in pig production. For every 100 sows served, 89 should farrow. In absence of specific diseases such as porcine parvovirus, pseudo-rabies, swine fever, leptospirosis and brucellosis, management failures are the most important causes of loss. A syndrome associated with reprod...

Effects of sow, boar, and semen traits on sow reproduction

Animal Model Evaluation Within Herd Linked to National Evaluation

Computer programs with modest computational requirements were developed to calculate animal model evaluations on a herd basis. Evaluations are connected to the ~ t i d system through parents with national evaluations and parents assigned to unknown-parent groups. The programs can be used to compute evaluations of animals in herds not included in national evaluations or to update evaluaticms bet...

Assessment of sow mortality in a large herd

Causes of sow and gilt death were appraised with postmortem examinations for 20 weeks (May to October) in a 5200-sow herd experiencing higher than expected sow mortality. Complete necropsy fi ndings and data are provided for 107 females. The locomotor, gastrointestinal, reproductive, and urinary systems were affected with lesions presumably causing death; however, lesions affecting the respirat...

A genetic analysis of sow productivity traits.

Genetic and phenotypic parameters for sow productivity traits were derived from analyses of records for 999 purebred Duroc and Yorkshire litters at the Beltsville Agricultural Research Center. Included were 682 spring-farrowed litters and 317 fall-farrowed litters. Primary traits examined were number of pigs born alive in the litter (NA), litter size at 21 d of age (N21), litter weight at 21 d ...