How genetics contributes to business

18 Sep, 2018 04:00 AM
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Our higher BPI cows have proven they are more profitable.

ImProving Herds was a three-year project that studied the contribution of herd improvement to Australian dairy businesses.

At the heart of the project were 34 inspiring Focus Farmers who agreed to put their farm, herd and financial records under the spotlight. Seven were Herd Test Focus Farmers and 27 were Genetics Focus Farmers. This is one of a series of case studies about their experiences of ImProving Herds Focus Farmers.

We farm at Allansford in Western Victoria and milk 700 Holstein cows. Our home farm, Ballyvernstown, is 319 hectares. We also have two run-off blocks - Clonleigh at 210ha and Rosyth Park at 100ha - that are used to grow our young stock.

I've been dairyfarming for 20 years and started with 180 Holstein, Jersey and crossbred cows on 100ha. We've slowly grown our herd for 15 years and kept the number stable for the past five years. We've chosen to have a closed herd so we rely on breeding our own replacements. Keeping a closed herd has been an important biosecurity tool and also means we have full histories on all our cows.

We run our milkers as one herd and have a seasonal calving pattern because we are totally dependent on rainfall. Last season, our herd averaged 8100 litres/cow and 590 kilograms of milk solids.

Our herd has used only Holstein genetics for the past 18 years. We are big users of artificial insemination and sexed semen. We have used 100 per cent AI on the cows for the past five years. I don't like having bulls in the milking herd for occupational health and safety reasons and as the herd has grown we had to run more bulls.

BPI means business

Our ImProving Herds results have clearly shown that high genetic cows - based on Balanced Performance Index (BPI) - contribute more to the farm business than the cows with the lower BPI figures in our herd.

The top 25 per cent of our herd, based on BPI, are producing an extra 377 litres of milk, 31kg protein and 46kg fat than the 25 per cent of cows with the lowest BPI figures.

The top 25 per cent of cows produce $356 a year more milk income after feed and herd costs compared with the cows in the bottom 25 per cent. They also last three months longer in the herd, which is equivalent to a third of a lactation more.

When you consider those differences across a herd of 700 cows, it adds up to a significant benefit in having cows with high BPI and selecting high BPI bulls to breed replacements. We need to be breeding and keeping heifers with higher BPI figures.

Our breeding program

Our key criteria when selecting bulls is production. We want bulls to be positive for fat and protein percentages and have good daughter fertility. I look at the all the key traits, but we particularly want good udders and type.

We use the Good Bulls app to get a short list of the bulls I will consider for using over the cows and the heifers. Once I have a list of suitable bulls, I will talk to both Tim Sedgely and Graeme Heaver as these semen reps have been working with our herd for a number of years. I also talk to Pete Williams at DataGene to run a bull team past him for his thoughts.

Our cow breeding program uses 600 doses of sexed semen and 800 doses of conventional semen with a synchronisation program using prostaglandin (PG).

We put our heifers through a Fixed Time AI (FTAI) program on the run-off blocks, but we don't do them all at the same time; we run them through in small mobs.

Most of the fresh sexed semen is used in our heifer AI program. We get the best conception rate with fresh sexed semen, but the number of bulls available for sexed semen can limit bull choices and the selection pressure for traits such as BPI.

We weigh and monitor our heifers regularly once they get to about 200kg and we grow them out on the run-off blocks in groups of 60-75. We have found the heifers do better in smaller groups and are easier to monitor. We keep the heifers in these mobs for synchronising and joining because one mob is a comfortable day's work between milkings and we want to make sure we minimise stress.

With an FTAI program, the heifers will go through the yards four to five times so I want them to be relaxed. By handling the heifers in batches, we end up joining 250-300 heifers in the different mobs over four separate days.

We then use Jersey bulls as mop-up bulls for the heifers. Sexed semen is expensive so if I use it in the main herd, I:

  • Only use sexed semen for the first two rounds of joining, i.e. the cow has to have calved in the first month of calving.
  • Only use sexed semen on younger cows, i.e. second and third calvers.
  • Only use on cows that have no history of calving issues before or after calving.
  • Only use it in cows that will be in the herd for the next 12 months.
  • We Metricheck all cows soon after calving to make sure they have cleaned up. We don't want to waste sexed semen on a cow if it has a reduced chance of conception. We don't have the option of carrying a cow over because we are a seasonal herd.

    Last season we joined 280 replacement heifers. We sold 60 and calved down 220; 140 calves were heifers. In the mature cows, we calved down 460 cows and had 310 heifer calves.

    All up, we had 450 heifer calves from 680 calvings. Of 450 heifer calves born last year, we will sell the late calves that are sired by conventional semen (in the cows) or by mop-up bulls (in the heifers), which leaves about 300 heifer calves that we genomically tested as part of ImProving Herds. We have recently been accepted as a Ginfo project herd and will be testing every heifer every year from now on. We use genomic testing as a tool to help make decisions earlier on which heifers to cull, which can be invaluable if we have a dry season or there are strong export prices if we have surplus heifers.

    This season we started calving on March 2 and by April 18, we had calved down 510 cows for a total of 375 heifer calves. That included 160 maiden heifers joined to sexed semen (140 heifer calves, 10 bull calves and 10 losses). At the time of writing this story, we still have 220 to calve. Genomic testing gives us a prediction on a number of key traits even before the heifer milks. If we have a surplus, we can sort out who to sell and who to keep at a younger age, which has helped pay to run our heifer blocks and cover the cost of genomic testing.

    Genomic testing has also proven to have real value in verifying the parentage of calves. We can all make mistakes when cows are joined in big numbers and then there is always a degree of mis-mothering when cows calve down in big numbers. Genomic testing gets rid of these errors.

    Our herd size can vary from 630 to 730 cows depending on the season. We drop herd numbers back in a dry season, which then gives us an opportunity to put a lot more selection pressure on the herd. Having a large number of heifer calves also means we can ramp up cow numbers quickly if we need to.

    Ideally, we want 220-230 heifers going into the herd each year to keep the age of the herd down and genetic progress heading in the right direction.

    Financial gains with sexed semen

    Having 150 surplus heifer calves to sell has made a big difference to our income streams in the business with stock sales now making up 25 per cent of the farm income, while milk accounts for 75 per cent. It's been a big change - we traditionally relied on 90 per cent of our income from milk sales and 10 per cent from livestock sales based on cull cows and low-value bobby calves.

    Making stock sales a growing part of the business has also been a valuable tool to manage income risk, which has been particularly important given the recent falls in the milk price.

    We have reared our bull calves for the past six years to sell to local farmers for use as commercial bulls. There is also scope for us to identify some genetically superior bulls as potential mop-up bulls for use in our heifer joinings, which, in turn, could generate more heifer calves.

    Increasing our income from the sale of surplus heifers and improving the value of our bobby calves has helped pay to run our heifer blocks and cover the cost of genomic testing.

    For more information, contact DataGene, phone (03) 9032 7191 or email abv@datagene.com.au.

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