Application of production sensitivity analysis to determine the order of priority of factors for the number of pigs weaned per mated female per year
2006
Takahashi, H.(Global Pig Farms, Shibukawa, Gunma (Japan)) | ; Sugimoto, T.
For determination of the order of priority of factors, which affect the number of pigs weaned per mated female per year (PWSY), production sensitivity analysis was applied. Field data collected from 79 commercial swine farms were used and the order was determined for each farm individually. The factors are total number of pigs born (TB), number of stillborn pigs (SB), number of mummified pigs (MB), piglet death rate during lactation (DR), non-productive mated female days (NPSD), gestation length (GL) and lactation length (LL). The prediction equation used was PWSY=(TB-SB-MB) x (1- DR/100) x ((365 - NPSD)/(GL+ LL)), and the target values were 12.5 pigs/litter, 0.8 pigs/litter, 0.0 pigs/litter, 6.8%, 34.1 days/(mated female.year), 115 days/litter and 19.7 days/litter for TB, SB, MB, DR, NPSD, GL and LL, respectively. For the first priority, the largest number of farms observed was 29 for TB, followed by 23 for DR, 19 for NPSD and 8 for SB. Once the actual values for each of the factors are acquired, production sensitivity analysis can be applied and it would effectively and practically prioritize those factors.
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