EFFECT OF NUMBER OF SPERM PER INSEMINATION ON FARROWING RATE AND LITTER SIZE IN YORKSHIRE SOW

K. Lalrintluanga[1]; B.C. Deka1 , L.Hmar, P.R.Choudhury , T.C.Tolenkhamba2
Page No. 121-125

Semen was collected from Large White Yorkshire (LWY) boars by gloved - hand technique twice
weekly and extended in Beltsville Thawing Solution (BTS) keeping 3x109 and 4x109 4 sperm per
insemination dose of 100 ml volume. The diluted semen was packed in cotchette and preserved at
180C in BOD incubator and was used for insemination within 3 days of storage. Single
insemination was done using sponge tip ‘Golden pig’ catheter in 56 and 57 oestrous female pigs
with preserved semen containing 3x109 and 4x109 sperm per insemination respectively on the 3rd
day of oestrus ( Day of onset of oestrus was the first day of oestrus). The farrowing rate was 64.91
and 64.30 per cent for 3x109 and 4x109 sperm per insemination dose respectively, the difference
being not significant. The mean litter size was found to be 7.92 ± 0.32 and 7.94 ± 0.39
respectively, the difference being non-significant. It could be concluded from the study that 3 x 109
sperm rather than 4 x 109 sperm per inseminate is recommended for economical use of semen as the
number of spermatozoa under studied did not have significant effect on the farrowing rate and litter
size in LWY sow .
Keywords: sperm number, insemination, farrowing rate, liter size, sow