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Global fertility in cows has steadily decreased over the last few years. In the UK, for example, first service calving rates fell from 55, 6 to 39, 7% between 1975-1982 and 1995-1998 - a 1% annual decline in first service pregnancy rate. In Spain the fertility indexes in cows have fallen over the last 10 years ago, accompanied by a frequency in the rate of postpartum disturbances and culling from...
The study investigated the relationship between estrus intensity and conception rates in dairy cows and heifers as well as between the level of physical constitution and conception rates in cows measured on the day of artificial insemination (AI). Females were submitted for AI after confirming standing estrus, and just prior to insemination the estrus intensity was investigated and classified as strong...
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