Our operation consist of 50 beef cows and 50 breeding ewes. The grant focuses on grazing 20 sheep in the neighbors vineyard.
Grape vines are a perennial crop planted on average 8-12 foot spacing. Grapes require good air flow to reduce fungus, which means the space under and between plants must be kept as open as possible. For erosion and soil health, Lac qui Parle Vineyards keeps their rows in a sod mix of bluegrass, fescue and dutch white clover, while the space directly under the grapes is either sprayed or cultivated to keep weeds down and air-flow good. This project proposes to accomplish sod and weed management with sheep rather than with farm labor and inputs by rotationally grazing ewes using a New Zealand grazing muzzle that will restrict them from eating forage higher than ground level. This will increase soil health with animal impact and manure, decrease chemical and fossil fuel inputs for the vineyard, and save money by reducing these inputs and harvesting the cover for forage. Finally, it will build community by neighbors working cooperatively together to improve their management and profitability.
- Evaluate if ewes can be grazed for the summer season in Northern vineyards to control ground vegetation.
- Measure the effectiveness of using WineBaa muzzles to allow ewes to graze ground vegetation of the vineyard without eating grapevines or fruit.
- Identify the ideal rate of animal units per acre in vineyard.
Three acres of the vineyard will be fenced with a perimeter and cross electric net fencing into 4 paddocks to ensure sheep stay in correct location and prevent predators (coyotes) from attacking and water tank in each paddock. A portable corral will be used to pen sheep when rotating sheep and if the grapes must be sprayed with a biologic (they have a 24 hour grazing restriction). Daily observation of the grape vines and ground vegetation to ensure ewes are eating grass and not vines. A grazing stick will determine how much forage is available and how much has been consumed and help determine the stocking rate of the vineyard. Ewes will be weighed and given body condition score at the beginning and end of grazing period.
WineBaa muzzles allow ewes to graze the ground but when a sheep lifts it’s head, the muzzle prevents it from eating foliage and fruit. Sheep will graze from May to August, because in August the vineyard is netted to prevent grapes from being eaten by bird and the nets are dangerous to sheep. The majority of the vegetation growth is complete by the end of summer so removing the sheep from the vineyard at this time would be appropriate for the goals.
The vineyard operator, will record hours being spent on traditional vegetation management (mowing, sucker remover, etc.) on the traditional managed portion of the vineyard verses the vineyard that will be grazed by sheep. Iowa Custom Rates will be used to value traditional practices versus the cost of rotational grazing sheep over a 5 year period and compare which is more economical from a labor cost.
Cornell Soil Assessment test will be collected on grazed paddocks and non-grazed paddocks in the spring and fall of 2019 and 2020 to compare any changes in the soil.
Educational & Outreach Activities
At this point, we are re-evaluating our objectives and hope to share our results from our reduced grazing project of 60 inch vines for summer of 2020. We hope to do a field day in the fall of 2020 if the sheep are successful on 60 inch vines. If too much damage is being done, the sheep will be removed and we will share our results in an article.
We released the ewes into the vineyard Mid-May after the vineyard perimeter was fenced with electric net fencing and cross divided into 3 paddocks. The sheep were rotated from paddock 1 to paddock 2 after 7 days, the sheep were rotated from paddock 2 to paddock 3 after 7 days. We had to re-adjust the muzzles 2 times on some of the sheep but overall the muzzles seem to fit well. I was out of the country for a week and Jon (owner of the vineyard) and my husband were observing the sheep.
When I returned home, I went to look at the project. Jon, Mark and I noticed that the vines in paddock 3 had no growth. We had not seen any grazing of the vines by the sheep and started to think it was winter kill of the vines (it was very common in the 2019 MN grapevines) or deer. I rotated the sheep back to paddock 1. The next day I went to observe the sheep again. It became apparent that the sheep were eating the new growth of the vines. The sheep were penned into the holding pen, loaded up and the grant was discontinued from the year.
The grapes had a big production setback after losing the 1st cycle of vegetation. However, the plants grew a second round of vegetation for the year but this caused approximately a 40 percent reduction in yield.
After much discussion, we decided the vines are too low at 42 inches from the ground to the lowest wire for the vines to grow on. More and more vineyards are going to 60-inch vines to increase air flow and ease of working underneath the vines. The Lac qui Parle vineyard has a few rows of 60-inch vines. We plan on running a few ewes for a short time on the 60-inch vines in the fall of 2020 (so they cannot eat growing or producing vines) for a few days to see if the can not eat the vines. I hope that at this height the project works because we have seen good results from grazing the vegetation and controlling suckers.
The project did achieve ground vegetation control; we were rotating every 7 days along with the sheep eating the sucker growth from the grape vine. Vegetation samples were collected to determine the amount of dry matter intake, but due to ending the project early in the season, we were unable to determine the grazing capacity of the summer. However, I did see an Avg. Gain of 6 pounds per ewe in the 22 days of grazing.