By Regan McCorquindale, FarmWise consultant.
We are seeing growth rates exceeding demand which is
allowing us to get to our fastest rounds and reduce supplements where possible.
Being based in the Waikato a lot of farmers have managed to
carry really high covers through winter. A challenge on farm can be managing
the quality and getting those residuals back to target. It is always key to
reinforce with yourself and/or your team the importance of hitting those target
residuals and the implications that will follow the next round if they aren’t
A few numbers on this
If your herd’s diet consists of mainly pasture now at 18kgDM
offered at 12.0ME, 216 MJME (Mega joules of Metabolic Energy) is available for
the animal’s daily requirements. Taking off maintenance and activity at ~60
MJME/day leaves 156 MJME available for milk production. 1kgMS requires
approximately 80 MJME (breed dependent). Based off these assumptions your cows
could produce ~1.95kgMS/c/d off this high quality pasture.
If residuals are
left poor for the following round those same pastures could drop to 11.0ME. The
same amount of feed offered is now only worth 198 MJME. With the same
requirements of the animal, this leaves 138 MJME available for milk production
which would allow them to produce approximately 1.72kgMS/c/d.
Multiplying these numbers out over any size of herd puts the
importance of hitting those targets into context. Ensure all your team is on
board in achieving this.
Using these assumed figures above and New Zealand’s average herd
size of 431 cows – DairyNZ Economic Survey (DairyNZ, 2018), the estimated cost
a day is as follows:
- 1.95kgMS – 1.72kgMS = 0.23kgMS/c/d
- 0.23kgMS/c/d x $6.75 (Fonterra forecast pay out
2019/20) = $1.55
- $1.55 x 431 cows = $669/day
This should emphasise the importance of keeping management
ahead of the 8 ball. Obviously this is not always attainable – the environment
can adversely affect these results too.
We often refer to pasture management as one of the 101 basics
of farming but it requires a lot of attention to detail and ensuring pre and
post grazing residuals are kept to the highest quality.
Post peak decline is a huge area of opportunity with a lot of farms ranging
from 20-30% to December. Top operators can manage 8-15%. A key driver of this
is ensuring we are offering the best pasture possible reinforced by continual
pasture walks, allocating feed, identifying surpluses in advance and not
letting silage get too long and losing quality. Would you rather have smaller
and more frequent cuts of good quality silage that you can utilise later to
boost milk production late lactation, or large quantities of below average
quality that will likely hold or impede production later in the season? Food
Preventing a post peak decline begins with your management
decisions now. This is obviously season dependent but a good idea is to work
out what you have done the last few years and set a new target for yourself and/or
the team to work towards.
Another key aspect to evaluate on your farm at the moment if
you are feeding supplement is ensuring you are either matching or improving the
nutritive value of your cows’ diets in relation to pasture quality. Adding a
low ME, low crude protein feed in at this time of year can be counterproductive
to your milksolid production. If your current pasture production and stocking
rate support the change it would be best to reallocate this feed to extend
lactation and/or contribute towards body condition gain later in the season.
An interactive task that you could do to educate members of
your team or to refresh your own memory is to calculate the different leaf
stages of the pasture sward. Remembering pasture quality and production is best
maximised at the 2.5-3 leaf stage for pre-grazing covers. Grazing before this
stage will delay regrowth as the energy stores of the plant have been eaten off
while beyond this stage the canopy closure occurs which will cause tillers to
die and increase shading and stem production, in turn reducing overall pasture
Anyway, enough from me. Hope calving finished
off well and you’ve managed to get a bit of a breather before mating.
Get in touch if you have any questions,
Regan – 027 650 7157