Wintering practices important for farm economics and environment
Bala Tikkisetty
The weather already this year has been a mixed bag of wet and dry. The winter season is now around the corner and who
knows what that will bring!
Soil health damage during winter has been recognised as a significant issue for the farming community. It coincides with
high stock densities and high soil moisture conditions.
It’s general practice during winter to graze stock intensively on winter forage crops supplying large quantities of feed
in a relatively small area.
But wet soils, heavy grazing and the resulting compaction/pugging can reduce future pasture growth and impact negatively
on farm productivity. So now is the right time for farmers to consider the impact of stock wintering practices on soil
health and water quality.
These practices can impact surface and ground water quality, as well as soil quality due to heavy concentrations of dung
and urine, the creation of bare ground and the risk of run off in wet weather. Many studies have shown that water
quality guidelines and standards have been exceeded as a result of intensive agricultural activities.
Livestock density is not the only factor affecting water quality – site selection and management of wintering systems
are also important considerations.
Here are some stock wintering options that achieve good environmental results, are animal-friendly and make economic
sense.
Feed and stand-off pads protect soil physical structure over wet periods. The feed pad is a dedicated concrete platform
where supplementary feeds are brought to the stock. It has higher feed efficiency as the wastage is reduced to about 5
per cent compared with 20 per cent or more when silage is fed in paddocks.
Stand-off pads are a dedicated loafing area for stock. These pads are constructed using a softer, free-draining surface
utilising materials like wood chips. As stock can be withheld from pasture for longer periods of time, the area required
per cow has to be bigger, say about 8m2. Capture of effluent is an important aspect of stand-off pads. It requires the
humped and hollowed base to be sealed underneath, either with compact clay or artificial liner or concrete, and the
captured effluent directed to a treatment system.
Animal shelters are gaining popularity. Herd homes are a combination of a feeding platform, stand-off facility and
animal shelter. Sheltered feeding for stock takes place over slatted concrete floors. As the cows stand on the
reinforced slatted floors, their effluent drops through and into a concrete-lined bunker below.
Composting barns are another type of stock wintering option, with the composting occurring in-situ. The cows roam freely
in the barn and lie on a mix of wood chips and straw. The beds must be kept dry by providing adequate ventilation and
aeration.
As a last resort, sacrifice paddocks can be used when other options are not available to stand animals off when it is
very wet, or as an area to feed animals hay and silage. However, there is a risk of soil structure damage and animal
health problems, such as lameness and mastitis. If soil potassium levels become too great (potassium is excreted in
urine) it may predispose the calving cow to metabolic problems. These come with a very high risk of discharges of
contaminants to water so must be sited well away from waterways, with an area of rank growth to trap any sediment or
dung that washes off.
Build your wintering pad well away from waterways and allow for solid and liquid waste disposal into your effluent
disposal system for the dairy shed. Don’t use supplementary feeds in areas where run off may reach any water body.
By planning now and implementing proper stock wintering management practices, you can play an important part in
improving water quality and soil health.
Bala Tikkisetty is a sustainable agriculture advisor at Waikato Regional Council