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Table 6 Selection response for sow productivity traits

From: Evaluation of direct and maternal responses in reproduction traits based on different selection strategies for postnatal piglet survival in a selection experiment

Trait Group LSM SE P value
Number piglets born (piglet/litter) \({\text{C}}_{\text{M}}\) 0.458 0.050 < 0.0001
\({\text{H}}_{\text{M}}\) 0.116 0.049 0.027
\({\text{R}} = 2\left( {{\text{H}}_{\text{M}} {-}{\text{C}}_{\text{M}} } \right)\) − 0.684 0.140 < 0.0001
Average piglet birth weight per litter (kg) \({\text{C}}_{\text{M}}\) − 0.025 0.005 0.0000
\({\text{H}}_{\text{M}}\) − 0.023 0.005 0.0000
\({\text{R}} = 2\left( {{\text{H}}_{\text{M}} {-}{\text{C}}_{\text{M}} } \right)\) 0.005 0.014 0.735
Standard deviation of piglet birth weight within litter (kg) \({\text{C}}_{\text{M}}\) 0.001 0.001 0.273
\({\text{H}}_{\text{M}}\) − 0.003 0.001 0.0001
\({\text{R}} = 2\left( {{\text{H}}_{\text{M}} {-}{\text{C}}_{\text{M}} } \right)\) − 0.009 0.003 0.0007
Piglet survival rate per litter at birth (%/litter) \({\text{C}}_{\text{M}}\) − 0.089 0.041 0.026
\({\text{H}}_{\text{M}}\) 0.009 0.040 0.833
\({\text{R}} = 2\left( {{\text{H}}_{\text{M}} {-}{\text{C}}_{\text{M}} } \right)\) 0.195 0.114 0.087
Piglet survival rate per litter during the nursing period (%/litter) \({\text{C}}_{\text{M}}\) − 1.023 0.113 < 0.0001
\({\text{H}}_{\text{M}}\) 0.285 0.112 0.007
\({\text{R}} = 2\left( {{\text{H}}_{\text{M}} {-}{\text{C}}_{\text{M}} } \right)\) 2.616 0.319 < 0.0001
  1. Least squares mean (LSM) of breeding values for the high and control groups (\({\text{H}}_{\text{M}}\) and \({\text{C}}_{\text{M}}\)) and their comparisons to be used to estimate the selection response R for various sow productivity traits. SE, standard error