Effect of birth weight on efficiency of beef production

The large 'lean beef' breeds are vulnerable to calving difficulties and losses. Dystocia is related to high birth weight. Data recorded from evaluation experiments show that the birth weight of the 'lean beef' taurus crossbreeds was high (39+/-2.1 kg). Indicus beef genotypes were selected with the birth weight (29+/-1.9 kg) significantly lower (P is less than 0.01) without a depression in the final yield of beef. To increase efficiency of beef production the lower birth weight factor needs be incorporated into genotypes for high viability and growth. Profitability depends on output per dam, in relation to inputs, on a herd basis. Hence, progress may depend on the application of such changes of genotype.