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D F Dowling

Publications and source records attributed to D F Dowling.

9 recordsLinked to original sources
PubMed1980

Adaptability of low cost tick-resistant cattle for growth.

Treatments to reduce costs, for example, extra indicus tick resistance in indicus/taurus strains, may not enhance beef profits. On the other hand, the negative correlation between productivity and adaptability to ticks can be reversed by the alternative use of 'lean beef' carcase characters. Results show that high indicus/lean beef genotypes are significantly (p less than 0.01) heavier than the cattle without the carcase character. That the 'right type of cattle' for a southern hemisphere situation, that is resistant/high yield genotypes, can be produced has been made clear.

Animals↗
PubMed1979

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.

Animals↗