1. Intensification of cow/calf production: a history;Maddux,2001
2. Historical landmarks in the American Cattle Industry;Taylor,1994
3. Double muscling in cattle: a review;Arthur;Aust J Agric Res,1995
4. Effects of twinning on dystocia, calf survival, calf growth, carcass traits, and cow productivity;Gregory;J Anim Sci,1996
5. Dystocia-related risk factors;Rice;Vet Clin North Am,1994