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This presentation was given at the International Goat Symposium in Lindsay, Ontario, Canada on September 19, 2007. “Profits Through Genetics”. Genetic Improvement Through Central Buck Testing Lessons and Opportunities.

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This presentation was given at the International Goat Symposium in Lindsay, Ontario, Canada on September 19, 2007.

“Profits Through Genetics”

genetic improvement through central buck testing lessons and opportunities

Genetic Improvement Through Central Buck TestingLessons and Opportunities

Susan SchoenianSheep and Goat SpecialistWestern Maryland Research & Education CenterUniversity of Maryland Cooperative Extensionhttp://www.mdgoattest.blogspot.com

www.sheepandgoat.com

which buck is better
Which buck is “better?”

I’m a pretty boy!

Yes, but what’s your average daily gain and how many times have you been dewormed?

You can’t judge a book by its cover.

the u s meat goat industry
Lags behind other animal industries in the use of performance records.

Selection decisions are made primarily on the basis of appearance.

The U.S. Meat Goat Industry
methods of genetic improvement
On-farm performance record keeping

Adjusted weights, ratios, indexes

Central performance testing

Ram, buck, bull, and boar tests

Progeny

Central performance record keeping

BLUP -- EPD’s and EBV’s

Across herd, across breed

Methods of genetic improvement
central performance testing
Central Performance Testing
  • "A central performance test is where animals from different herds are brought to one central location where performance is recorded. The rationale is that observed differences are more likely due to genetic differences, which will be passed onto offspring, rather than environmental differences, which will not be passed onto offspring. The goal of a central performance test is to identify genetic differences among animals." -- Dr. Dan Waldron, Texas A&M University
western maryland pasture based meat goat performance test
Western Maryland Pasture-Based Meat Goat Performance Test
  • Established in 2006
  • Up to 50 male goats
  • Pasture-only diet1
  • Graze early-June through early-October (~112 days)
  • Collect data on growth, parasite resistance and resilience, and carcass merit.

12007 drought necessitated use of nutritional tubs and hay.

resources for test
Resources for test
  • Pasture
    • 10-acre pasture system
    • Divided into five 2-acre paddocks
    • Cool season grass pastures: Max Q™ tall fescue, orchardgrass, and chicory.
    • Warm season grass: field of pearl millet added in 2007 (~1.5 additional acres).
  • Fencing
    • Perimeter fencing: 6-strand, high-tensile, electric.
    • Interior fencing: 2 to 4 strand electric.
    • Pearl millet fenced with electric netting.
resources for test9
Resources for test
  • Central laneway
    • 3 port-a-hut shelters
    • Two mineral feeders
    • Water troughs
    • Handling system with work platform
test requirements goats
Test requirements: goats
  • Male goats (bucks or wethers)
  • Any breed or cross
  • Born between December 15 and March 15
  • Vaccinated two times for CD-T.
  • Weaned for at least 2 weeks prior to test.
  • Hooves in condition to stand in foot bath.
  • Free from contagious diseases.
  • Appropriate size (weight) for age.
  • National scrapie ID.
  • Health papers.
results participation
Results: Participation

Kiko, Boer, Kiko x Boer, dairy x meat

upon arrival to test site
Upon arrival to test site
  • Unload into handling system.
  • Stand in footbath of zinc sulfate for 10 minutes
  • Secure in head gate on elevated ramp for close inspection
  • Collect fecal sample
  • Determine FAMACHA© score
  • Determine body condition score
  • Deworm with Moxidectin
  • Delouse, if necessary
  • Treat for coccidiosis in water for first three days of test
test protocol management
Managed as a single group on pasture.

Rotationally grazed.

Checked 1 to 2 times per day.

Handled every two weeks for data collection and general health monitoring.

Test protocol/management
reports to consigners
Reports to consigners
  • Every 2 weeks
  • Created a blog to communicate with producers and anyone else interested in test.

http://mdgoattest.blogspot.com

data collection
Data collection
  • Growth
    • Weigh every 14 days
  • Parasite resilience
    • Determine FAMACHA© scores every 14 days
    • Evaluate body condition score every 14 days
  • Parasite resistance
    • Collect fecal samples at 0, 28, and 56 days
  • General health
    • Treat problems and note in records
  • Carcass merit
    • Ultrasound scanning for backfat thickness and rib eye area
  • Scrotal circumference
growth performance average daily gain adg pounds grams per day
Growth PerformanceAverage daily gain (ADG) – pounds (grams) per day
  • Goats are weighed every 14 days.
    • Initially, they were weighed every 28 days.
  • First two weeks serves as an adjustment period.
results growth performance
Results: growth performance

Average daily gain (ADG)

2006 – 0.190 lbs. (86 g) per day2007 – 0.235 lbs. (107 g) per day

parasite resilience ability to maintain production in the face of infection with parasites
FAMACHA© scores every two weeks.

1,2 – do not deworm

4,5 – deworm with moxidectin

3 - ?????

Previous scores

Scores of other goats

Body condition score

Average daily gain

Condition of hair coat

Parasite resilience Ability to maintain production in the face of infection with parasites.

FAMACHA© scores estimate packed cell volume (PCV) [blood hematocrit.

results parasite resilience
Results: parasite resilience

20

20

11

Anthelmintic treatments

2006 – 1.65 treatments per goat2007 – 0.09 treatments per goat

parasite resistance ability of host to prevent infection
Parasite resistanceAbility of host to prevent infection
  • Fecal samples collected from rectum of each goat.
    • 0 days
    • 28 days
    • 56 days
    • 96 days (2007)
  • Fecal egg count (FEC) determined using modified McMaster technique.
  • Eggs per gram (EPG)
general health and thriftiness
General health and thriftiness
  • Goats have been treated for:
    • Fever
    • Respiratory symptoms
    • Ear infections
    • Scours
    • Bloat
    • Lice
zero tolerance for cl caseous lymphadenitis
Zero tolerance for CLcaseous lymphadenitis
  • Goats with abscesses are isolated for testing or sent home.
  • Abscesses are lanced and tested.
  • Goats with CL are sent home or to market.
  • Goats with non-CL abscesses can return to the test.

Non-CL abscess

what it costs to run
What it costs to run

Annual costs

  • Fertilization program for pasture
  • Pasture renovation
  • Fencing repairs
  • Anthelmintics and other medicine
  • Fecal testing
  • Ultrasound scanning
  • Daily goat care
  • Miscellaneous
current funding
Current funding
  • Producers pay a testing fee of $75 per goat
    • $20 due at time of nomination.
    • Balance ($55) due when goats are delivered to test site.
  • Grant funds have paid for shelters, handling system, some fencing, and two years of labor.
  • In 2007, producers were able to consign additional goats for $30 per goat in order to meet the goal of having 50 goats in the test.
  • Two 4-H consigners paid a reduced fee of $50 per goat to have their goats tested.
lessons what we ve learned
Lessons: what we’ve learned
  • We can monitor performance better if we weigh the goats every 14 days vs. 28-day intervals.
  • We were deworming the goats too much the first year; FAMACHA© scores of 3 do not usually need dewormed.
  • The FAMACHA© system is an effective system for monitoring and controlling internal parasites (barber pole worm) in meat goat kids grazing summer pastures.
challenges
Challenges
  • Must have the right person taking care of the goats.
  • The test needs to pay for itself.
  • Getting enough goats for test.
  • Getting producers to understand and use performance data when buying and/or selecting meat goats.
opportunities
Opportunities
  • Most meat goat producers do not understand how to make genetic improvement in their herds.
  • Most meat goat producers do not value performance testing.
  • Most meat goat producers do not understand central performance testing.
  • Boer goat breeders are less interested in performance testing (on pasture) than Kiko breeders.

I’m not just a pretty boy.

opportunities29
Opportunities
  • It will take years to develop this performance testing program and for it to gain acceptance among the widespread meat goat industry.
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Thank you for your attention.

QUESTIONS?

http://mdgoattest.blogspot.com

http://www.sheepandgoat.com

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