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Association between lactation length and sow reproductive performance and longevity
1Department of Clinical and Population Sciences, College of Veterinary Medicine, University of Minnesota, St Paul 55108, USA.
Journal of the American Veterinary Medical Association
|April 1, 1997
Summary
Shorter lactation length in sows is linked to poorer reproductive performance and reduced longevity. Genetic line and parity also influence these outcomes, requiring careful consideration in herd management.
Area of Science:
- Animal Science
- Reproductive Biology
- Swine Production
Background:
- Understanding factors influencing sow reproductive performance and longevity is crucial for efficient swine production.
- Lactation length is a key management decision in swine operations, potentially impacting sow productivity and lifespan.
Purpose of the Study:
- To investigate the association between lactation length and sow reproductive performance.
- To determine the relationship between lactation length and sow longevity (herd retention).
Main Methods:
- A cohort study was conducted using data from 15 breeding herds in Minnesota and Iowa between 1986 and 1992.
- Sows were categorized by genetic line and parity.
- Multivariate regression and logistic regression analyses were employed to assess reproductive traits and longevity.
Main Results:
- Lactation length, genetic line, parity, and their interactions significantly affected litter traits and weaning-to-mating intervals.
- Sows removed from herds exhibited significantly shorter lactation lengths compared to retained sows of the same parity.
- Sows with shorter lactation lengths had a higher risk of removal from the herd.
Conclusions:
- Lactation length is demonstrably associated with both reproductive performance and sow longevity.
- Genetic line and parity are important co-factors influencing these outcomes.
- Herd management strategies, particularly concerning early weaning practices, should account for genetic lines and sow parity.