0	0.12271	protein cells expression pig cell proteins genes gene 
1	0.12594	piglets day breed weight arginine days litter pigs 
2	0.15475	pigs feed protein diet diets weight growth energy 
3	0.18108	pig production farmers pigs africa farming farms high 
4	0.079	swine virus gene influenza viruses pig flu analysis 
5	0.089	coli isolates salmonella resistance strains microbiol antimicrobial isolated 
6	0.06053	soil organic application water production soils table concentration 
7	0.101	pigs transportation control experimental stress values animals road