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Breeding / Calving Issues
Inducing Cows to Calve Early
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<blockquote data-quote="simme" data-source="post: 1817456" data-attributes="member: 40418"><p>Maybe or probably. In order to affect the numbers, a person would need other calves sired by other bulls and report the numbers together. If several calves by bull A were induced early and several calves by bull B were not induced and birth weights were similar on both sets, then the epd calculations would show that the bulls have similar effects on the calves bw within a pasture group. So, inaccuracy and misleading there for sure. But what is the overall effect on bull A's bw epd from this? depends on the quantity of early induced calves from bull A compared to the number of full term calves reported from all herds in the registry. The BW epd for the Charlo bull for instance is based on the reported bw of 4930 calves, so a few induced calves would not have much effect. If the reputation of the bull is such that many or most calves are induced, then definitely presents an inaccurate epd.</p><p></p><p>For this bull, both the CE and BW epd's are very good. It is the CEM epd that suggests that keeping replacements might carry some risk. That CEM epd is based on 1255 daughters that had calving ease reported. For people that don't value epds, they might disregard both the bad epds and the good ones. But, if someone told me that had calved out 1255 daughters of this bull and pulled way more than average, I would tend to avoid him. Purebred or commercial.</p><p></p><p>EPD's on a low accuracy bull are like the 10 day weather forecast. EPD's on a high accuracy bull are more like the next day forecast. Trusting epd's without looking at accuracies is like cutting hay based only on the 10 day forecast. Might work and might not.</p></blockquote><p></p>
[QUOTE="simme, post: 1817456, member: 40418"] Maybe or probably. In order to affect the numbers, a person would need other calves sired by other bulls and report the numbers together. If several calves by bull A were induced early and several calves by bull B were not induced and birth weights were similar on both sets, then the epd calculations would show that the bulls have similar effects on the calves bw within a pasture group. So, inaccuracy and misleading there for sure. But what is the overall effect on bull A's bw epd from this? depends on the quantity of early induced calves from bull A compared to the number of full term calves reported from all herds in the registry. The BW epd for the Charlo bull for instance is based on the reported bw of 4930 calves, so a few induced calves would not have much effect. If the reputation of the bull is such that many or most calves are induced, then definitely presents an inaccurate epd. For this bull, both the CE and BW epd's are very good. It is the CEM epd that suggests that keeping replacements might carry some risk. That CEM epd is based on 1255 daughters that had calving ease reported. For people that don't value epds, they might disregard both the bad epds and the good ones. But, if someone told me that had calved out 1255 daughters of this bull and pulled way more than average, I would tend to avoid him. Purebred or commercial. EPD's on a low accuracy bull are like the 10 day weather forecast. EPD's on a high accuracy bull are more like the next day forecast. Trusting epd's without looking at accuracies is like cutting hay based only on the 10 day forecast. Might work and might not. [/QUOTE]
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