meat goat sire evaluation test using the growsafe 4000 system
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MEAT GOAT SIRE EVALUATION TEST USING THE GROWSAFE 4000 SYSTEM. David Seymour WVU Extension Agent – Pendleton County [email protected] 304-358-2286. Objective. Determine the feasibility of adapting the GroSafe system to meat goat bucks for collecting data for a sire performance test .

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meat goat sire evaluation test using the growsafe 4000 system

MEAT GOAT SIRE EVALUATION TEST USING THE GROWSAFE 4000 SYSTEM

David Seymour

WVU Extension Agent – Pendleton County

[email protected] 304-358-2286

objective
Objective
  • Determine the feasibility of adapting the GroSafe system to meat goat bucks for collecting data for a sire performance test.
growsafe system
GrowSafe System

GrowSafe Systems collect individual feed data to measure feed efficiency in terms of net feed intake.

slide5
Adapting to Goats:

Was a challenge

2006 buck feeding trial
2006 Buck Feeding Trial
  • 23 commercial bucks from one commercial herd were evaluated on the GrowSafe system for 41 days.
  • ADG ranged from 0.46 to 1.12 lbs/day with the group averaging 0.67 lbs/day.
  • Ultrasound carcass data from the rams on the trial, adjusted to 80.43 pounds, ranged from 0.04-0.12 inches for backfat and 1.27-1.93 square inches for LEA.
what makes this performance test unique
What makes this performance test unique?
  • Feed Efficiency Data / Residual Feed Intake (RFI)
relationship of adg w maturity
Relationship of ADG w/ Maturity

ADG →

Must grow to larger size to equal stage of finish. i.e. greater mature size

Physiological maturity →

genetic scaling theory
Genetic Scaling Theory
  • Increased growth rate leads to increased mature weight and a consequent increase in maintenance requirements.
  • In most ruminant production systems 65-75% of the total lifetime dietary energy is used for maintenance
    • Only 5-22% is used for protein deposition.
    • Maintenance energy requirements have been shown to be moderate to highly heritable (h2=0.22-0.71)
if so important then why have we waited until now
If so important then why have we waited until now?
  • Difficulty in obtaining necessary measurement:
    • Gain
    • Individual feed intakes
      • ??? validity of data under non-production environment.
      • Understand what the data means and what concerns there are with the data generated.
efficiency of conversion of feed
Efficiency of Conversion of Feed
  • RFI (actual – expected)
    • Considerable individual animal variation in feed intake above and below what is expected based on size and growth
rfi the practice
RFI –The Practice
  • Increase in weight over time is measured with multiple observations and modeled by regression.
    • Normalization of the growth curve to avoid periods of morbidity or restriction.
    • Initial weight, ADG, midpoint weight and final weight are calculated from the regression.
    • Intake is regressed on mid BW+ ADG
      • Mid BW is very important!
      • This gives us an expected value for animals of similar weights and rates of gain.
rfi the theory
RFI – The Theory
  • RFI is independent of growth and maturity patterns.
  • RFI is a more sensitive and precise measure of feed quality based on energy intake and requirements.
  • Uses accurate contemporaries for comparison
    • Positive RFI indicates less efficient use of energy compared to contemporaries
    • Negative RFI indicates greater efficiency
  • RFI has been shown to have a heritability coefficient near .45, similar to growth.
results
Results
  • Residual Feed Intake (RFI), ranged from 3.24 to (-)2.54 lbs/day. The buck with the RFI value of (-) 2.54 was more efficient and consumed 2.54 pounds less feed than was expected per day.
  • Difference between the most and least efficient bucks was 5.78 lbs of feed per day (a cost of $ .65 per day
result
Result
  • The trial demonstrated the GroSafe feeding system with modifications can be used to test meat goats.
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