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Biomedical subjects

W G Whittlestone

Publications and source records attributed to W G Whittlestone.

7 recordsLinked to original sources
PubMed1976

Bovine plasma corticoids during parturition.

Concentrations of adrenal corticoids in plasma were determined by a competitive protein-binding technique using jugular blood samples taken three times daily and more frequently during labor from 21 cows before and after parturition. The prepartum value was 6 ng/ml with a sharp rise during the last 16 h before calving. The average value at the time of calving was 19.2 ng/ml with a significant drop 1 h after calving to 11.2 ng/ml and a return to basal concentrations by 3 days postpartum. Evidence that labor is responsible for the increased corticoid is given. Maternal cortisol at calving was correlated with the time taken to calve .23, calf cortisol .04, cow:calf weight ratio -.07, and calf weight .14.

Animals↗
PubMed1976

Movement of infection between milk tubes, teat cups, and teats with a jacketed airflow cushion in a single chamber teat cup.

Transfer of bacteria between teat cups, between teats of the same cow, and between teats of different cows was investigated by tracer bacteria applied to teat skin and by injection of tracer bacteria or colored fluids into the short milk tube. In spite of the unidirectional flow of milk and air with the single chamber teat cup, no advantage over a conventional system in transfer of tracer bacteria from cup to cup, teat to teat, and cow to cow showed.

Animals↗
PubMed1975

Diurnal variations in blood cortisol in the dairy cow.

Concentrations of adrenal corticosteroids in plasma were determined by a competitive protein-binding technique in blood samples taken hourly over 24 h from four dairy cows, each sampled for three 24 h periods. Mean blood cortisol was 7.9 ng/ml. Statistical analysis revealed no diurnal variation. Reasons for this are postulated.

Animals↗