Is Grass Fed Really the Best Option for Dairy Cows?


Lately there has been a lot of interest in grass-fed milk or milk that is produced by cows fed only grass on pasture or hay. The idea being that grain is evil and bad for the cows and the milk they produce.  I’d argue that this is one of the new marketing tactics for the dairy industry and may not be the best option for all dairy cows.

brown cow 

A couple of years ago I became interested enough in the concept of grass-fed to do some research. I milk Jersey cows and I was curious if I would save enough money to offset the loss of milk production and income I would suffer if I didn't feed my cows grain. Milk production can drop by 30 percent or more when cows are no longer fed grain. It seemed like a fairly simple equation to solve, until I asked my vet, who is a very progressive practitioner. He studies holistic treatments and works extensively with organic dairies.  When I asked him about switching to only grass-fed, he urged me not to.  He said my cows were already thin enough and thought they would become dangerously thin if I stopped feeding them grain. Not only would their milk production drop but also they could develop breeding problems and not be able to regain the body condition needed when they become pregnant again. Dairy farmers call that getting bred back. 

I was a bit surprised and inquired about all the farmers he knows who have stopped feeding their cows grain. My vet told me he knew of a few farms that tried to go grain-less but he didn't know of any that had succeeded. And we live in Vermont. So what gives? 

brown cow2

Based upon my continued research I have come to the following conclusion: beef cattle and dual purpose breeds of cows that have been bred for both milk and beef can sustain themselves on just grass and hay. They retain a healthy portion of the feed for their body condition. They put it on their back as fat. But cows that have been bred to maximize milk production, like Holsteins, Jerseys, and Guernseys are bred to convert the feed they eat into the milk they produce. They are not bred to put fat on their backs. They are bred to make milk. 

It is very difficult to fatten up a cow that produces a lot of milk. They will stay skinny and only begin to put on weight during the last few months of their lactation and during their dry period before they calve again.  It is essential that they do have good body condition when they calve so they have the reserves required to make all the milk they need without turning into skin and bones. A good dairy cow already looks like it is just skin and bones to the untrained eye.

12/9/2015 12:03:41 AM

The comment by CaseyT is correct. I milk healthy Guernseys in Michigan and they are 100% grass fed. They consume high quality hay from different fields (lessening the chances of mineral deficiency from the soil) for 6 months of the year, pasture for the other 6 months. They are all very healthy (never thin!) with robust calves, and give a good quantity of high quality milk. Our pregnant cows get about 2 cups of oats or barley a few days/week with mineral supplements and herbs to support pregnancy near calving time. "Grass fed" is not a fad -- It's the diet ruminants have evolved to utilize. Your cows are likely thin because the quantity and/or quality of pasture and hay they get is not sufficient. Increase the amount and quality and you will get better milk production on a grass diet.

4/30/2015 11:31:18 AM

The author's assumption that specific milking breeds don't do well on strictly grass comes from trying to transition dairy cows too quickly from grain to just grass. Please do not conclude that Jerseys cannot thrive on grass alone. They can. Jerseys that have been fed grass their whole lives can and do maintain good body conditions on strictly grass. If you want a successful grass-fed dairy operation, you need to pay close attention to the genetics and lineage history of the cows you bring into your herd. Expecting grain-fed cows to quickly transition to eating strictly grass was an ill-advised experiment that was doomed from the start.

4/29/2015 2:54:51 AM

I'm getting ready to buy a Jersey for milking. What types of grain should I feed it?

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