Dixon Springs Fescue Grazing Study
Graduate Student: Bain Wilson
Advisor: Frank Ireland
Mentor: Dr. Daniel Shike
Project Overview
Tall fescue is a very hardy forage found across the United
States. Fescue’s drought and pest-resistance
result from its endophytic fungus, Acremonium coenophialium. However,
this ergot alkaloid producing endophyte also causes negative effects on
animals, known as fescue toxicosis. The main ergopeptide found in tall fescue
is ergovaline. Fescue toxicosis inhibits the animal’s thermoregulation and
decreases growth.
During the grazing trial, there will be three testing groups
of cattle receiving two different treatments of forages & two control
groups receiving only endophyte-infected fescue or novel endophyte-infected
fescue.
Other forages to be used include a sudangrass with the brown
mid rib gene and crabgrass mix.
To evaluate the different grazing systems, differences will
be measured in forage availability, forage nutrient content, calf ADG, symptoms
of thermal stress, and calf activity level.
My Hypothesis
I hypothesize the cattle grazing on endophyte-infected
fescue will display more symptoms of thermal stress and poorer overall
performance during Period 2 than those grazing on the other forages.
Objectives
Determine which forage type yields the cattle with best
performance, specifically, by measuring differences in:
- Forage Availability
- Forage Nutrient Content
- Calf Average Daily Gain (ADG)
- Symptoms of Thermal Stress
- Calf Activity Level
Determine if novel endophyte-infected fescue or warm season
annuals are suitable alternative to endophyte-infected fescue in a rotational
grazing system.
4 grazing treatments with two replicates of each treatment
per year will be utilized:
Period 1 = May 1 –
July 15
Period 2 = July 15
– October 2
Four different forages will be used, including the negative
control of endophyte infected fescue (KY-31) (E+), the positive control of
novel endophyte infected fescue (Max Q Jesup) (NE), and a sudangrass with the
brown mid rib gene and crabgrass mix
(Red River and Quick N Big) (SC).
Six steer calves will be used as tester animals for each
treatment. Six calves will be added to each treatment group to be used as “put
and take” animals in order to maintain grazing pressure across all treatments.
Each pasture is divided into six 1.5 acre paddocks which the calves are rotated
into every 5 days.
The proposed treatments are as follows:
Treatment #
|
Period 1
|
Period 2
|
1
|
E+
|
E+
|
2
|
NE
|
NE
|
3
|
E+
|
NE
|
4
|
E+
|
SC
|
Differences in the following areas will be measured as
follows:
1. Forage availability
- Use rising plate at beginning of grazing in each pasture and again at the end of each rotation
- Measure forage mass in four randomly chosen sites within each pasture at beginning of trial and again every 30 days
2. Forage Nutrient
Content
- Clip samples while measuring forage mass
- Dry samples and send to forage analysis lab to determine nutrient content
3. Calf Average
Daily Gain:
- Double-weigh calves at beginning of Period 1
- Reweigh calves between Periods 1 & 2 and also at the end of the trial in August
4. Symptoms of Thermal Stress
- Measure respiration rate for tester cattle in each treatment
- Take blood on the 1st & 2nd of May, June, July, and August and again on August 31st to measure serum prolactin levels
- Assess hair coat and assign body conditioning scores at each weighing and bleed point
5. Calf Grazing Behavior
- Measure amount of steps taken by attaching pedometers to the legs of the tester animals in each treatment
Lastly, all data will be assessed to determine the effects of
each grazing treatment. Based on these
results, we will determine which forage or combination of forages yields the
most positive overall effects on the tester cattle.
Period 2 Update
- Due to the drought, Period 1 has been extended at least 15 days to allow the warm season treatment to grown in.
- The sudangrass was also replanted June 7th and 8th at 25 lbs/acre. This regrowth must reach a height of 18-20 inches before grazing to reduce the prussic acid toxicity.
- If Period 2 begins July 15th, the end date of the trial will be pushed back to October 2nd or 3rd.
- If an adequate forage amount for this treatment is not achieved, the project will be thrown out for this summer.
Deliverables & Outcomes
- Bain Wilson will present the research at the Midwest Conference
- More information on the effects and alternatives to endophyte-infected fescue will be available
- Producers will have more evidence to support switching their pastures to an alternative forage and avoid the profit losses caused by fescue toxicosis
Eileen and I are also trying to create a companion animals
program here. So, each week we take a day to visit a local shelter, vet clinic,
or pound to assess the needs down here. By the end of the summer, based on the
feedback we have received from these places, we will hold an event or create
educational pamphlets for the local pet owners. Some ideas that we’re throwing
around is a spay/neuter weekend, free microchipping, or creating pamphlets on
the importance of flea and tick prevention, heartworm prevention, spay/neuter,
and other responsibilities that pet owners have.
So far, we have visited an animal shelter in Metropolis, a
vet clinic in Vienna, and the City of Harrisburg Animal Control. We actually
volunteered at Project Hope, the shelter in Metropolis, after church today. It
was great to see that a few of the dogs that we met during our last visit had
been adopted, including Jax (the husky) and
2 of 3 other puppies that I had played with.
Anyways, my dad came down to visit me last weekend for
Father’s Day. I don’t think I have ever been so excited to see someone. I had
so much fun showing him my steer calves and all the other bulls and heifers,
demonstrating my cattle callin’ abilities, and exploring the area. Him and I had a deja vu when I saw that one of my calves had made it through the fence and was catchin up with his buddies across the lane. It took me back to when we were "camping" but were actually just sleeping in a tent outside the house. Dad woke me up and got me outside the tent. Pointing towards the farm shop, he asked, "Are you seeing what I'm seeing?" Yes I was. It was our miniature donkey, Eeyore. He had gotten out of his pen, made his way up the driveway, and was wishing us good morning.
I’m so glad he got to come down to see all that I have been
working on and everything I have been telling him about in person. I really do
love it down here. It reminds me of my years on the farm, except now I'm old enough to have more responsibilities and I don't get to eat the "dud" apple cider donuts. Even on my days off work, I usually end up stopping in at
the lab to say hi to the guys and see if I can do anything. I can’t believe how
fast this summer has gone. To be honest, it makes me sad to think I’ll be
heading back at the beginning of August. But I know the memories will outlast
the summer.
All the ladies at the fence after I sent out my cow call |