How to compare different breed EPD's

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denoginnizer

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OK, before you have a coniption fit I know you are not suppose to do this. But If you had to pick a angus bull and a charloais bull that would throw the same size calf from the same cow how would you go about picking the bulls. The calves from these bulls would have the same birthweight, same weaning weight, same lack of trouble to the cow during birthing.
 

MikeC

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denoginnizer":1ezaadvf said:
OK, before you have a coniption fit I know you are not suppose to do this. But If you had to pick a angus bull and a charloais bull that would throw the same size calf from the same cow how would you go about picking the bulls. The calves from these bulls would have the same birthweight, same weaning weight, same lack of trouble to the cow during birthing.

There is an across breed epd chart somewhere. I'll see if I can find it.
 

MikeC

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001 ACROSS BREED EPD ADJUSTMENTS - Scott Greiner, Extension Animal Scientist, Beef, VA Tech

The table of adjustment factors to estimate across-breed expected progeny differences for various beef cattle breeds was released at the Beef Improvement Federation Annual Meeting in San Antonio, Texas on July 13. By using the across breed adjustment factors, animals of different breeds can be compared on the same EPD scale. The adjustment factors are based on comparative studies of the breeds conducted at the U.S. Meat Animal Research Center in Clay Center, Nebraska.

To calculate across breed EPDs, simply add the adjustment factor found in the table to the existing within-breed EPD for the animals of interest. For example, consider a Simmental bull with a WW EPD of +30 and a Charolais bull with WW EPD of +15. Would we expect the progeny out of different breed of dam for these two bulls to weigh about the same? To fairly compare the WW EPDs of these two bulls of different breeds, the EPDs must first be adjusted using the across-breed table. Using the table, the Simmental bull would have an across-breed WW EPD of +50.7 (30 + 20.7 = 60.4) and the Charolais bull an across-breed WW EPD of +52.7 (15 + 37.7 = 59.8). In this example, we would expect progeny of the Simmental bull and Charolais bull to be very similar on the average for weaning weight (across breeds EPDs of 50.7 vs. 52.7, for only a two pound difference) when mated to cows of a different breed.

The adjustment factors may also be useful in managing uniformity when breeds are rotated in a crossbreeding system to avoid large fluctuations in traits such as birth weight and milk. For example, using these adjustments, it can be demonstrated that a Gelbvieh bull with a milk EPD of +7 will add similar milk genetics when compared with an Angus bull with a milk EPD of +20 (both the bulls would be +20 on an across-breed basis). This demonstrates the differences between the breeds that exist- as a Gelbvieh bull with a +7 milk EPD ranks in the lower 5% of the Gelbvieh breed for milk genetics, whereas the Angus bull with a milk EPD of +20 ranks in the top 20% of the breed. With this in mind, a Gelbvieh bull can be selected to compliment an Angus cow base that will add a moderate amount of milk. Similar calculations can be made for birth weight and growth. The key is to recognize the basic genetic differences between breeds, and then select of bulls within those breeds with optimum genetics while avoiding extremes.
2001 Adjustment Factors to Add to EPDs of Various Breeds to Estimate Across-Breed EPDs
Breed Birth wt. Weaning wt. Yearling wt. Milk
Hereford 3.6 0.4 -8.8 -14.4
Angus 0.0 0.0 0.0 0.0
Shorthorn 7.4 28.0 39.1 13.1
South Devon 6.8 20.1 36.0 2.2
Brahman 13.1 34.1 -9.1 24.6
Simmental 6.8 20.7 18.1 13.2
Limousin 5.9 22.1 16.2 -1.0
Charolais 10.5 37.7 50.8 6.0
Maine Anjou 6.5 16.0 0.7 10.8
Gelbvieh 5.8 8.1 -19.9 13.1
Pinzgauer 7.6 26.1 21.3 7.2
Tarentaise 3.7 28.5 10.5 17.2
Salers 5.1 26.9 35.1 12.4
Red Angus 3.3 -4.0 -5.7 ---
 
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denoginnizer

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Thanks that was very helpful. Where would I look to find the current average actual birthweight for each breed? For example if the number is +5 what is 0. Is 0 the average for every breed?
Also I noticed CED wasnt listed on the comparsion charts can someone shed some light?
 

ollie

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denoginnizer":39xp0we5 said:
Thanks that was very helpful. Where would I look to find the current average actual birthweight for each breed? For example if the number is +5 what is 0. Is 0 the average for every breed?
Also I noticed CED wasnt listed on the comparsion charts can someone shed some light?
Epd's are not a tool to use when trying to find a bull with a certain birthweight. They will never tell you what the average calf from bull (A) will weigh. If you are wanting a bull with a heavier ww for example there is no epd in the world that will tell you which bull will increase your ww by 50lbs. Actual data however is a valuable compairison. If you are weaning 600 lb calves and want to be able to wean 650 lb calves you need to find a bull that is raised in an environment similiar to yours under management similiar to yours and choose a bull with a weaning weight of 700lbs. Epd's are ONLY to be used as a compairison between two bulls (they are better if they are two bulls of the same breed) if they are any value at all.CED is a epd that isn't included on some breeds epd's.
 

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