G. L. Cromwell, T. S. Stahly, L. A. Edgerton, H. J. Monegue, T. W. Burnell, B. C. Schenck, B. R. Schricker,
Recombinant porcine somatotropin for sows during late gestation and throughout lactation. Journal of Animal Science. ,vol. 70, pp. 1404- 1416 ,(1992) ,
10.2527/1992.7051404X