graze-l July 2006: [SPAM] - Re: [SPAM] - Re: [SPAM] -
Re: [SPAM] - Re: [Graze-l] Crossbreeding - Email found in subject - Email found
in subject - Email found in subject - Email found in subject
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This is true. Let me remind you why we are discussing fertility - it is
mainly because I am claiming that NZ genetics have higher fertility and Dave
disagrees with this thought. Yes It would seem not too beneficial to select
for fertility, but NZ farmers dont directly select for fertility. They are
forced to cull late or empty cows due to their seasonal system, which means
they are indirectly selecting for fertility by culling out the worst cows
each year and keeping the best. This practise has been done for over 50
years by probably 90% of our farmers, therefore our NZ genetics in general
will have higher fertility due to this ongoing selection criteria.
On a slightly different note, our NZ bulls have fertility BVs and there is a
substantial difference between the best and worst fertility bulls. Some
farmers choose their bulls based on this trait if they have fertility
problems in their herd etc and yes perhaps it is management problems for
them rather than genetic, but maybe they dont want to change their
management and would rather improve their cows genetically to suit their
management!
Yes the more traits you select for, the slower the genetic improvement. But
keep in mind that our main breeding companies get to select from nearly all
the dairy cows in NZ (4 million) and when you have that much selection you
are going to get bulls that have great BVs for nearly all their traits.
Thus using these bulls means you are breeding for numerous traits and
getting good genetic improvement in nearly all the traits.
Michelle.
On 7/1/06, Clay & Sue McQuiddy <mcquiddy@getgoin.net> wrote:
>
> If fertility is 5% inheritable and other traits in the herd such as udders
> and production are 45% inheritable, wouldn't it be more profitable to
> concentrate on the higher heritability traits until they are satisfactory
> before addressing something that is only 5% inheritable? Keep in mind
> that
> the more traits you select for, the slower the genetic improvement in
> each
> trait.
>
> Clay
>
> MO Ozarks
>
> ----- Original Message -----
> From: "Shorty" <siesta@ihug.co.nz>
> To: <graze-l@witt.ac.nz>
> Sent: Saturday, July 01, 2006 3:40 AM
> Subject: [SPAM] - Re: [SPAM] - Re: [Graze-l] Crossbreeding - Email found
> in
> subject - Email found in subject
>
>
>
>
> Dave Gneiser wrote:
>
> >
> > We've been there and done the fertility trait discussion. Fertility
is
> a
> > very low inherititble trait. Fertility is more environmental than
> > genetic.
>
> NZ indications show fertility as a 5% inheritable trait. Move that out
> 10 years and my cows are far more fertile. Add breeding and good
> management and the farmer must be a winner.
>
> regards
> Ian Buckingham
> New Zealand
>
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