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- W89764659 abstract "To evaluate reproductive performance and quantify factors that may affect it requires accurate data and valid analytical techniques. Unfortunately, many studies have drawn inferences from data on calving interval or herd average days open, both of which suffer from bias, lag, and momentum (Stewart et al., 1994). Other reports have focused on conception risk (CR) as a measure of fertility, but at best this only reflects part of the process of making open cows pregnant, in that it does not account for cows that were not inseminated, or for when insemination occurred. The best available single measure of overall reproductive performance at the herd level is pregnancy risk (PR), commonly called pregnancy rate (LeBlanc, 2005). The pregnancy, insemination, and conception risks in a large sample of Ontario dairy herds over the last six years are presented in Figure 1. There was no significant decrease in any of the parameters over this period. However, a longer time span and further analyses are needed to determine whether there is a trend for decreased pregnancy rate over time, and to measure the associations of physiologic and management influences on reproductive performance." @default.
- W89764659 created "2016-06-24" @default.
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- W89764659 date "2005-02-16" @default.
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- W89764659 title "Overall Reproductive Performance of Canadian Dairy Cows: Challenges We Are Facing" @default.
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