母猪的繁殖性能是猪场主要生产指标，而母猪的背膘厚与繁殖性能存在较强的相关性。为研究母猪妊娠期不同阶段调控背膘厚对母猪的繁殖性能的影响，以温氏种猪公司新法系经产大白母猪为研究对象，测定妊娠期各阶段母猪背膘厚及繁殖性能。结果表明：妊娠前期和中期背膘厚调控范围为-2~3 mm母猪繁殖性能最佳；妊娠后期背膘厚调控范围为-2~0 mm母猪繁殖性能最佳。妊娠期母猪背膘厚保持在合适的范围，可以提高其繁殖性能，增加猪场效益。
The reproductive performance of sows is one of the main production indicators for pig farms. There is a significant correlation between back fat thickness and reproductive performance of the sow. To study effects of back fat thickness on reproductive performances of sows at different stages of gestation period by regulating, the new French Large White pig from Wens breeding pig company were chosed as subjects. The back fat thickness and reproductive performances were measured at different stages of gestation period. The best reproductive performance of sows appeared in early pregnancy and mid-pregnancy with back fat thickness regulation range of -2 to 3 mm. The best reproductive performance of sows appeared in late pregnancy with back fat thickness regulation range of -2 to 0 mm. Back fat thickness of sow keep in a appropriate range, which can improve its reproductive performance and increase benefits of pig farm.