J. Hertl

Publications35
h-index22
Citations2,776
Highly Influential Citations259
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Risk factors for post partum ovarian dysfunction in high producing dairy cows in Belgium: a field study.
An epidemiological study of risk factors for postpartal ovarian disturbances was carried out on 334 high-yielding dairy cows in 6 well-managed Belgian herds. Ovarian activity was closely monitored… Expand
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Effect of pathogen-specific clinical mastitis on milk yield in dairy cows.
Our objective was to estimate the effects of the first occurrence of pathogen-specific clinical mastitis (CM) on milk yield in 3071 dairy cows in 2 New York State farms. The pathogens studied were… Expand
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Effect of diseases on the culling of Holstein dairy cows in New York State.
The effect of seven diseases on culling was measured in 7523 Holstein cows in New York State. The cows were from 14 herds and had calved between January 1, 1994 and December 31, 1994; all cows were… Expand
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The cost of generic clinical mastitis in dairy cows as estimated by using dynamic programming.
The objective of this study was to estimate the cost of generic clinical mastitis (CM) in high-yielding dairy cows given optimal decisions concerning handling of CM cases. A specially structured… Expand
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The cost of different types of lameness in dairy cows calculated by dynamic programming.
Traditionally, studies which placed a monetary value on the effect of lameness have calculated the costs at the herd level and rarely have they been specific to different types of lameness. These… Expand
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The association between previous 305-day milk yield and disease in New York State dairy cows.
Logistic regression was used to examine the association between milk yield and disease. We studied 8070 cows of second or higher parity from 25 New York State Holstein herds, calving between June… Expand
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Effect of clinical mastitis on the lactation curve: a mixed model estimation using daily milk weights.
The objective of this study was to estimate the milk production losses associated with clinical mastitis using mixed linear models and correlation structures that have not been available previously.… Expand
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Effects of clinical mastitis caused by gram-positive and gram-negative bacteria and other organisms on the probability of conception in New York State Holstein dairy cows.
The objective of this study was to estimate the effects of different types of clinical mastitis (CM) on the probability of conception in New York State Holstein cows. Data were available on 55,372… Expand
  • 106
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Effect of repeated episodes of generic clinical mastitis on milk yield in dairy cows.
Our objective was to estimate the milk losses associated with multiple occurrences of generic bovine clinical mastitis (CM) within and across lactations. We studied 10,380 lactations from 5 large,… Expand
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Effects of repeated episodes of generic clinical mastitis on mortality and culling in dairy cows.
Bovine clinical mastitis (CM) can be detrimental to a dairy farm's profitability, not only in terms of lost production and treatment costs, but also because of the loss of the cows themselves. Our… Expand
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