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Re: butterfat

Posted: Wed Jan 08, 2014 9:02 pm
by regolith
WalnutCrest wrote:Anyone know if there are any DNA tests for "butterfat content"?

I know UC-Davis tests for A1 v A2 milk ... but wasn't sure if anyone tested for butterfat.


It's one of the traits included in genomic profiling, and no, I don't know the details.
You could get useful information from ancestral indexes, at low reliability. But probably a lot cheaper than doing genomic profiling.

btw, I'm milking one May daughter, she's a little doll but not sure that she's back in calf. She was the youngest of the group and the grazier didn't grow her out properly, he no longer has a job growing yearling heifers. Have some more to calve next year.
The Murmurs will calve next spring, I'm told they will turn into capacious little cows but based on their growth thus far am not keen to use him again.

Some new faces in the bull selection teams in the top AI companies in NZ and things have changed a little since this thread started, for the better we hope.

Re: butterfat

Posted: Wed Jan 08, 2014 9:28 pm
by WalnutCrest
I'm interested in butterfat as I have a dual purpose breed (Aubrac). The French claim they have very high butterfat content milk, and I was curious if there would be an easy way to test this from animal to animal (via hair / blood sample).

Thanks.

Re: butterfat

Posted: Thu Jan 09, 2014 10:21 am
by TexasBred
WalnutCrest wrote:I'm interested in butterfat as I have a dual purpose breed (Aubrac). The French claim they have very high butterfat content milk, and I was curious if there would be an easy way to test this from animal to animal (via hair / blood sample).

Thanks.

Why not test the actual milk from each animal? Take the "estimates" out of the equation.

Re: butterfat

Posted: Thu Jan 09, 2014 10:42 am
by WalnutCrest
If you know how to collect milk from a bull, I'd love to hear about it.

Re: butterfat

Posted: Mon Jan 13, 2014 11:35 am
by TexasBred
WalnutCrest wrote:If you know how to collect milk from a bull, I'd love to hear about it.

You never mentioned "bull" smart be nice. :shock: Do you know how to collect it from a cow?

Re: butterfat

Posted: Mon Jan 13, 2014 12:03 pm
by WalnutCrest
TexasBred wrote:
WalnutCrest wrote:If you know how to collect milk from a bull, I'd love to hear about it.

You never mentioned "bull" smart be nice. :shock: Do you know how to collect it from a cow?


Several things:
* I have no pride as to the relative intelligence of my posterior. I'm sure yours is quite capable, too.
* I have some theories about getting milk from a cow, yes.
* I didn't intend to offend you.

Back to my original questions, if a particular bull (or cow) is genetically predisposed to pass on traits for higher butterfat content, that'd be something I'd like to know about. Is anyone aware of a genetic test (or research working on a genetic test) for butterfat content?

Re: butterfat

Posted: Mon Jan 13, 2014 12:10 pm
by Taurus
Simple way: test the butterfat from the bull's daughters and the bull's dam as well!

Re: butterfat

Posted: Mon Jan 13, 2014 12:34 pm
by WalnutCrest
Taurus wrote:Simple way: test the butterfat from the bull's daughters and the bull's dam as well!


Ok ... not as simple as sending a straw of semen to a lab somewhere though. Thanks.

Re: butterfat

Posted: Mon Jan 13, 2014 3:14 pm
by TexasBred
WalnutCrest wrote:
Taurus wrote:Simple way: test the butterfat from the bull's daughters and the bull's dam as well!


Ok ... not as simple as sending a straw of semen to a lab somewhere though. Thanks.


Actually it is that simple except you send a refrigerated vial of milk to a lab to have it tested. American dairies that are on DHIA program will receive a printout showing butterfat, protein, SCC, Bateria, etc. on every cow individually. Here are some things that can and will affect butterfat in cattle other than breed.


Genetics: 55% of variation in milk composition is due to heredity. Therefore it is important to select for high BF%.

Age of cows: As cows grow older, BF% decreases.

Stage of lactation: First three months of lactation BF% decreases, next three months it remains constant, thereafter it increases again. If a high proportion of your cows all calf at the same time, a low BF% problem may occur two to three months later.

Bred or Open: Pregnancy causes an increase in the BF%. If cows are not pregnant, this increase will not occur.

Level of milk production: Higher production tends to have a diluting effect on BF%. (But not on total BF produced).

Body condition: Thin cows – underfeeding before calving will lead to a lower BF% after calving.

Disease: Will generally lower milk fat. Depressed rumen activity and chronic rumen acidosis lowers BF%. Infections of or injury to the udder (high somatic cell counts, mastitis) lowers BF%.

Re: butterfat

Posted: Tue Jan 14, 2014 7:06 pm
by WalnutCrest
Thanks for the detail. I appreciate it.

With this info, I find myself wondering if there is a standard age that dairy breeds test at ... and/or ... a standard phase in the lactation cycle that dairy breeds test at ... in order to say that Breed X has a ____% butterfat on average?

I would assume there is some sort of well-established protocol for this sort of thing so that the various breeds could be comparing apples to apples.

Re: butterfat

Posted: Tue Jan 14, 2014 7:42 pm
by cow pollinater
Most dairies test weekly. With dairy comp its a real quick glance to see what genetics are doing what across all stages of lactation and you can make it more specific for age and stage of lactation if you feel the need.

Re: butterfat

Posted: Tue May 10, 2016 10:48 am
by Petercoates87
Our new jersey gives almost 4 gallons a day we keep bout 2 gallons for ourselves. When that's scaled I get roughly 3 8oz jars of cream sometimes a Lil more.

Re: butterfat

Posted: Tue May 10, 2016 8:01 pm
by cbcr
WalnutCrest wrote:Anyone know if there are any DNA tests for "butterfat content"?

I know UC-Davis tests for A1 v A2 milk ... but wasn't sure if anyone tested for butterfat.


As the Composite Registries, we use GeneSeek. They have the Crossbred test and if the animals are at least 87% purebred can be tested with the USDA.

With the GeenSeek Crossbred test, instead of the report coming back to us on the 1 - 10 scale, we get the raw data.

There are 15 traits and include Milk, Fat & Protein. Also Kappa Casein, Beta Casein and Beta Lactoglobulin

Re: butterfat

Posted: Tue May 10, 2016 8:09 pm
by cbcr
CRV is selling NZ Jersey as well as the KIWI which is a HOJO cross. https://sires.crv4all.us/shop/us/catalog/JNZ

Viking Genetics- Jersey semen is being distributed by Creative Genetics of California http://creativegeneticsofca.com/

Re: butterfat

Posted: Tue May 10, 2016 8:10 pm
by cbcr
cow pollinater wrote:Most dairies test weekly. With dairy comp its a real quick glance to see what genetics are doing what across all stages of lactation and you can make it more specific for age and stage of lactation if you feel the need.


Dairies that are on DHI test still test once per month.