Impact of wean to standing reflex interval on litter size of sows (Short Communication)

Abstract

Sow reproduction influences farm economy and can be considered as key factor of pig production efficiency. The aim of this study is to evaluate the effect of wean to standing reflex interval on the total number of piglets born and correlated number of piglets born alive and number of piglets weaned. Study was performed on crossbreed of Large White and Landrace sows originated from a commercial farm thus our results describe the real effect under commercial conditions. The results indicate that wean to standing reflex interval influence the litter size traits negatively if this interval is longer than 108 h. Highest differences was detected between 84 and 108 h of wean to standing reflex interval where decreasing about 2.8 total number of piglets weaned (P≤0.01) was found. Mutually only small effect of number of inseminations was detected.

Production of Transgenic Pigs with an Introduced Missense Mutation of the Bone Morphogenetic Protein Receptor Type IB Gene Related to Prolificacy

“…Another integration site on SSC13 was located within the large intron 1 (97.5 kb) of CMTM8 , a potential tumor suppressor gene ( Zhang et al, 2012b ). Sow litter size has been widely regarded as a complex trait affected by various elements including physiological, genetic and environmental factors and their interactions ( Urban et al, 1966 ; Leymaster and Bennett, 1994 ; Humpolicek et al, 2012 ), thus large numbers of litters are required to accurately estimate the litter size performance between transgene-positive and negative sows. In addition, as introns are considered a safer location to contain exogenous genes ( Renault and DuChateau, 2013 ; Awe et al, 2014 ), we should further identify the transgene-positive sows with only a SSC13 integration site for comparing litter size performance with transgene-negative sibling sows.…”