1. Recent findings on fertility disorders in the pig;AKKERMANS;Fortschr. Vet. Med.,1980
2. Some general principles of housing for reproductive efficiency in pigs;BAXTER,1978
3. Early sexual maturity and mating of gilts;BROOKS;ADAS Quart. Rev.,1978
4. Pregnancy diagnosis in the sow by rectal examination;CAMERON;Aust. Vet. J.,1977
5. Statistical Methods in Research and Production.;DAVIES,1972