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Offline knabe

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double muscling
« on: September 16, 2009, 04:36:12 PM »
hadn't noticed this before.

maine's have two of the disruptive types.

http://us.igenity.com/pdfs/forms/Igenity%20Results%20Key%20Beef.pdf

Myostatin
Myostatin, as part of the IGENITY Profile, analyses for nine different variants of the myostatin gene, even though some may not be found all breeds.
Six variants are classified as disruptive; these cause muscle hypertrophy (double-muscling), larger birth weights, increased dystocia and enhanced tenderness.
Three myostatin variants are referred to as missense, and will increase muscularity and reduce external and intramuscular fat, with no change in birth weight.
For all myostatin variants one copy is intermediate.
Disruptive variants are: Missence variants are:
C313Y nt419                      D182N
E226X nt821                      F94L
E291X Q204x                    S105C
Myostatin results are reported as:
0 None of the nine possible variants are present
1, Variant One copy of the listed variant is present
2, Variant two copies of the listed variant are present

Offline simtal

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Re: double muscling
« Reply #1 on: September 16, 2009, 10:08:49 PM »
what about tenderness? still bad i suppose. 

waygu cross?
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Offline HerefordGuy

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Re: double muscling
« Reply #2 on: September 16, 2009, 11:44:10 PM »
This is great Knabe, thanks for sharing.  With recent advances in sequencing and SNP chips, these marker panels are only going to get better.  Very exciting time in animal breeding.  (clapping)

Offline AAOK

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Re: double muscling
« Reply #3 on: September 17, 2009, 07:53:00 PM »

In my 17 years of breeding high % Maine-Anjou I produce one double muscled calf; FR Magic sire X Patriot x Administrtor Dam.  The bull calf also rolled over at the knee in both front legs.  I got the little rascal up to 1100 pounds while he could still get up and down.  Best meat we ever put in the freezer.

Offline knabe

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Re: double muscling
« Reply #4 on: September 17, 2009, 10:12:54 PM »

In my 17 years of breeding high % Maine-Anjou I produce one double muscled calf; FR Magic sire X Patriot x Administrtor Dam.  The bull calf also rolled over at the knee in both front legs.  I got the little rascal up to 1100 pounds while he could still get up and down.  Best meat we ever put in the freezer.


that is really annoying.

on the face of it, smithbuilt was linebred with supposedly no faults, and i'd hadn't heard either epinal or cunia were double muscle carriers who fill out the cow side of magic.  that means magic may have two faults? potentially SP and DM.  if smithbuilt is a carrier and epinal and touchdown are not, that narrows down a troubling bit of a theory i've had for a while.

was bysantin a double muscle carrier?  this thread might make me cry.  i guess that's ok. i have a way out. but it will have to be verified.  dang, more testing.  hmm.  maybe double muscling was an early quiet exit for some of the early maine's.

was covino III a carrier?

Offline Olson Family Shorthorns

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Re: double muscling
« Reply #5 on: September 18, 2009, 10:04:17 AM »
I know it's in Shorthorns too, we had two calves born with it two years ago, out of the same bull, and vastly different pedigrees on the dam side.  The bull was a Waukaru Goldmine 2109 x IWF Magic. The cows were by JA Wellington and RB Eagle 148 (all thought Eagle bulls were SUPER heavy muscled, diluted Double Muscling? Especially Eagle 256).  Maybe there is a link between the Maine and Shorthorn DM.
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Offline knabe

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Re: double muscling
« Reply #6 on: September 18, 2009, 12:01:19 PM »
diluted Double Muscling?

that is one theory, ie a continuous.

since there are two forms in maine's, it might be more annoying.  they both truncate about a third in in the protein. not as early as the limi one, which is bp94.  need to double check.

Offline Zach

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Re: double muscling
« Reply #7 on: September 18, 2009, 02:57:33 PM »
we had two calves in a row from the same bull same cow. both bull calves. very muscular like their quarters were exploding and they had big muscular toplines, i think they were double muscled.. we just put one in the freezer a few weeks ago. the meat is as good as i can remember anything we have ever had. the bull was a pale face angus and the cow was half shorthorn and some maine in her.
« Last Edit: September 19, 2009, 09:25:20 AM by zach »
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Offline stangs13

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Re: double muscling
« Reply #8 on: September 18, 2009, 09:41:30 PM »
I was reading up on limousins and they can carry a form of double muscling, a diluted gene i would guess, dont remember.
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Offline knabe

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Re: double muscling
« Reply #9 on: September 18, 2009, 10:09:06 PM »
I was reading up on limousins and they can carry a form of double muscling, a diluted gene i would guess, dont remember.

google this.

F94L

Offline Telos

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Re: double muscling
« Reply #10 on: September 19, 2009, 04:41:52 AM »

 

Apparently it was the rule of thumb not to report a DM calf to the Maine Assoc.. Would it be great to be able and ask the AMAA for a list of all their DM carriers.
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Offline phillse

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Re: double muscling
« Reply #11 on: February 15, 2019, 01:59:33 PM »
Bumping this old thread up since the thread http://www.steerplanet.com/bb/the-big-show/list-of-triple-clean-shorthorn-bulls/ is discussing myostatin genes.
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Offline phillse

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Re: double muscling
« Reply #12 on: February 15, 2019, 02:05:45 PM »
hadn't noticed this before.

maine's have two of the disruptive types.

http://us.igenity.com/pdfs/forms/Igenity%20Results%20Key%20Beef.pdf

Myostatin
Myostatin, as part of the IGENITY Profile, analyses for nine different variants of the myostatin gene, even though some may not be found all breeds.
Six variants are classified as disruptive; these cause muscle hypertrophy (double-muscling), larger birth weights, increased dystocia and enhanced tenderness.
Three myostatin variants are referred to as missense, and will increase muscularity and reduce external and intramuscular fat, with no change in birth weight.
For all myostatin variants one copy is intermediate.
Disruptive variants are: Missence variants are:
C313Y nt419                      D182N
E226X nt821                      F94L
E291X Q204x                    S105C
Myostatin results are reported as:
0 None of the nine possible variants are present
1, Variant One copy of the listed variant is present
2, Variant two copies of the listed variant are present


Can anyone shed any light on the Missence variants? 
They are said to increase muscularity and reduce external and intramuscular fat, with no change in birth weight.
Does anyone have any more information or specifics about these :
D182N
F94L
S105C
Wisdom and Patience are both virtues.  However, they are attained only by failures, tests and trials.

Offline Cabanha Santa Isabel - BR

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Re: double muscling
« Reply #13 on: February 15, 2019, 02:15:59 PM »
DM in Shorthorn can came from Chianina and Maines.
UK Shorthorn are full of DM, they used Maine Anjou massivelly as well as some NA genetics with Maine, as Trump on ancestors.
Here, I inspected some calves for register, found 3 DM. Descarded!
Sired by a canadian bull, that show a strong muscle on back.

Offline Willow Springs

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Re: double muscling
« Reply #14 on: February 15, 2019, 11:23:14 PM »
Quote
DM in Shorthorn can came from Chianina and Maines.
UK Shorthorn are full of DM, they used Maine Anjou massivelly as well as some NA genetics with Maine, as Trump on ancestors.
Here, I inspected some calves for register, found 3 DM. Descarded!
Sired by a canadian bull, that show a strong muscle on back.

You've got that backwards - my understanding is that the double muscling in the Maines came from the Durham Shorthorn cattle that were used to create the Maine Anjou breed. That is also where the Belgian Blue got there double muscling. So the cattle in the UK may have gotten it from the Maines that were bred back in, but there was probably some still in their own population.

As to the Canadian bulls siring double muscling - yes there are a few known in very popular bloodlines.

 

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