New Zealand
February 19, 2-26
Modern proprietary cultivars backed by independent data are the strong preference for Waikato dairy farmer Mike McGehan when he needs reliable and targeted pasture performance.
McGehan farms 135ha in the Scotsman Valley and runs a crossbred herd of 400 cows, fitted with collars, on a System 3-4 operation.
The herd is on track to achieve record production of around 185,000kg milksolids for the season after he dropped beef genetics in favour of short-gestation semen at mating. The move significantly tightened the herd’s calving spread to 92% of the cows calving in the first six weeks.
For his re-grassing programme, he looks closely at the National Forage Variety Trials (NFVT) data and also considers feedback from his network before choosing specific cultivars that will deliver the high-quality feed he needs at critical times in the season, to maintain cow condition and production.
A large area of the farm previously had whey spread on it which boosted soil fertility to very high levels.
“Our strategy is to pull some of the levels down because they can be a challenge, particularly Potassium levels on the effluent blocks,” he says.
The original effluent block is being continually cropped followed by an annual grass to lower its fertility to more sensible levels.
“We’re trying to get 30 tonnes/ha average of forage off those paddocks but this can be a challenge because we are direct drilling maize to preserve the soil structure because it’s also the main area for our springer cows,” he says.
“In total, we’re doing around 20-22ha of summer crop each year and I’m probably under-sowing another 20-30ha on the dairy platform.”
By selecting proprietary cultivars off the NFVT list for his region, he can consider which ryegrass options best suit individual paddocks, depending on a range of criteria, including soil type, contour, drainage, and aspect.
“Because we’re now calving over a much shorter period of time, we’re starting to use more of the early-heading ryegrass varieties, and there are some good ones out there at the moment,” he says.
Another example of dialling in cultivars is a leased block of rolling clay country at the rear of the farm which is exposed to the westerly wind and prone to drying out.
“Down there, we’ve been using a fescue hybrid that seems hardier and drought tolerant.”
One area of the farm can flood after heavy rain, so Mike adopts a specific strategy for any regrassing where he is prepared to use lower-value seed options.
“I’ve experimented with different options on the area that can get wet in a big rain event, but I definitely wouldn’t use low-cost seed in other areas where I expect it to be in grass for a long time.
He admits that having his own drill means he is more inclined to try different options in the same paddock to see what works best.
“I’m still targeting a kind of grass that I want for that particular paddock so we are able to utilise it best at the time of year it’s required.”
Once a cultivar decision is made, timing of sowing is critical to maximising pasture growth and future milk production. He always aims to get at least one grazing in before winter.
Gaps in pasture supply are filled with bought-in feed and a combination of maize and summer turnips grown on the property.
“Apart from pasture, we’re also typically feeding between 500-800kg/cow of meal blend, which is mostly palm kernel, and we grow around 250-300 tonnes of maize silage each year on the farm,” he says.
He uses farm maps to keep track of his drilling plan through the seasons so he knows what is sown in each paddock in his re-grassing or cropping programme.
“The hard part is, when the companies are bringing new grasses out every few years, I have to try them all out!”
To access the latest National Forage Variety Trial results for any region, head to pbra.co.nz and click on the Trial Data tab or click this link https://www.pbra.co.nz/trial-data/forage-grasses/
About the NZ PBRA
The organisation represents plant breeders, intellectual property owners and managers of proprietary agricultural seed. The Association’s members are companies whose primary focus is the development and marketing of plant intellectual property through demonstrating the strength of research-proven standards of performance.
By investing in the development and supply of improved and innovative plant cultivars and endophytes to farmers, PBRA members contribute to the continued success of New Zealand’s world-leading agricultural sector.
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