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Biomedical subjects

H L Barr

Publications and source records attributed to H L Barr.

3 recordsLinked to original sources

Practical mastitis control in the field.

Research has shown the effectiveness of teat dipping and medically treating all nonlactating cows to control mastitis. However, there is a problem of getting dairy-men to accept the program. Improved educational programs might be helpful. Some means of visual evaluation is essential to acceptance. Use of indirect tests for estimating cell content can be helpful in evaluating control efforts and in demonstrating results. More intense coordinated effort by professional persons advising dairy-men is necessary.

Animals

Influence of estrus detection on days open in dairy herds.

Data from 10 herds on a herd reproductive status program supported estimates of lost reproductive days per cow per year due to conception failure and missed heat as 23 and 10 days. The corresponding estimates from Ohio Dairy Herd Improvement were 14.7 and 40.3 days. The correlation within the 10 herds between days lost due to failure to conceive and total days open was .38 and between days lost due to missed heats and total days open .92.

Animals