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Risk factors for post partum ovarian dysfunction in high producing dairy cows in Belgium: a field study.
- G. Opsomer, Y. Gröhn, J. Hertl, M. Coryn, H. Deluyker, A. de Kruif
- 1 March 2000
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
Body condition related to ketosis and reproductive performance in Norwegian dairy cows.
The relationships between body condition score (BCS) and ketosis, and between BCS and reproductive performance in 732 moderate yielding, dual-purpose cows were studied. The cows were of the breed… Expand
Effects of milk fever, ketosis, and lameness on milk yield in dairy cows.
The effects of milk fever, ketosis, and lameness were studied using data from 23,416 Finnish Ayrshire cows that calved in 1993 and were followed for one lactation (i.e., until culling or the next… Expand
The effect of lameness on milk production in dairy cows.
Data were collected prospectively for 1.5 yr on two New York dairy farms to investigate the effect of lameness on milk production. The numbers of study cows (percentages treated at least once for… Expand
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
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
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
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
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
Cow- and quarter-level risk factors for Streptococcus uberis and Staphylococcus aureus mastitis.
- R. Zadoks, H. G. Allore, +4 authors Y. H. Schukkent
- Biology, Medicine
- Journal of dairy science
- 1 December 2001
This study was designed to identify risk factors for intramammary infections with Streptococcus uberis and Staphylococcus aureus under field conditions. An 18-mo survey with sampling of all quarters… Expand