johndeereboy
Well-known member
I am new to the whole registered herd thing. I have 7 cows, and 3 of them have calved. How do I figure out the Epd's of the Calves?
Please help.
Please help.
johndeereboy":f4vg6fuo said:I am new to the whole registered herd thing. I have 7 cows, and 3 of them have calved. How do I figure out the Epd's of the Calves?
Please help.
Alan":20fv0udf said:I have found that adding the 2 parents and dividing by 2 doesn't work that often. Seems like by the time I get the current EPD's back from the association they are off as much as 2 to 4 numbers. It's close enough to guess but a long way from accurate. Not sure as to why the big difference, but one thought is that the sires and dams EPD's a ever changing. Or that in different EPD categories it not a 50/50 split, meaning, the dam or sire may have more enfluence in a certain area.... just a guess.
Alan
Alan":2gk570sz said:I have found that adding the 2 parents and dividing by 2 doesn't work that often. Seems like by the time I get the current EPD's back from the association they are off as much as 2 to 4 numbers. It's close enough to guess but a long way from accurate. Not sure as to why the big difference, but one thought is that the sires and dams EPD's a ever changing. Or that in different EPD categories it not a 50/50 split, meaning, the dam or sire may have more enfluence in a certain area.... just a guess.
Alan
MikeC":q2zjx1jk said:Alan":q2zjx1jk said:I have found that adding the 2 parents and dividing by 2 doesn't work that often. Seems like by the time I get the current EPD's back from the association they are off as much as 2 to 4 numbers. It's close enough to guess but a long way from accurate. Not sure as to why the big difference, but one thought is that the sires and dams EPD's a ever changing. Or that in different EPD categories it not a 50/50 split, meaning, the dam or sire may have more enfluence in a certain area.... just a guess.
Alan
This method is used only as an "Interim" EPD, until a new Sire Summary is computed using all the available data.
The time lag between the computations (my breed assoc. computes twice per year) is what is making them look inaccurate or different.
Alan":269nrjil said:When the association computes the EPD on a calf, is it a 50/50 split between the sire and the dam or will one have more of an influence on a certain EPD?
Thanks,
Alan
Aero":2y1bm0zt said:Alan":2y1bm0zt said:When the association computes the EPD on a calf, is it a 50/50 split between the sire and the dam or will one have more of an influence on a certain EPD?
Thanks,
Alan
50/50
MikeC":2a30tb66 said:Aero":2a30tb66 said:Alan":2a30tb66 said:When the association computes the EPD on a calf, is it a 50/50 split between the sire and the dam or will one have more of an influence on a certain EPD?
Thanks,
Alan
50/50
I agree with you Matt. But would the "Heritability" of certain traits from the Sire or Dam play a factor in the computations?
MikeC":2kmt7tf6 said:I agree with you Matt. But would the "Heritability" of certain traits from the Sire or Dam play a factor in the computations?
jnowack":2iupbn89 said:Alan,
Traits are infuenced by genetics, environment, and heterosis. The amount of variation in the trait that is caused by genetics is the heritability. The remainder of the variation is caused by environment or heterosis.
When animals are raised in the same environment or contemporary group, the environmental variation is eliminated and the remaining variation in traits such as ww, yw etc can attributed to the genetics of the individuals and compared using ratios that will be used in calculating the EPD's.
As for the heterosis it is minimal in purebreds, I think is just ignored. However I think they have some heterosis adjustment factors for some of the composites such as Balancers so that they can be ratioed against purebreds.
Aero":104239uy said:jnowack":104239uy said:Alan,
Traits are infuenced by genetics, environment, and heterosis. The amount of variation in the trait that is caused by genetics is the heritability. The remainder of the variation is caused by environment or heterosis.
When animals are raised in the same environment or contemporary group, the environmental variation is eliminated and the remaining variation in traits such as ww, yw etc can attributed to the genetics of the individuals and compared using ratios that will be used in calculating the EPD's.
As for the heterosis it is minimal in purebreds, I think is just ignored. However I think they have some heterosis adjustment factors for some of the composites such as Balancers so that they can be ratioed against purebreds.
there is no EPD component for variation. EPDs by nature are averages over large groups. they would need another value like Acc to express variance of the calves.
johndeereboy":10tpe9gk said:so what i should do is turn the birthweight and the birthdate of the calf into the Angus Association, and they will figure it out for me?