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 Dave.Seymour@mail.wvu.edu 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

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MEAT GOAT SIRE EVALUATION TEST USING THE GROWSAFE 4000 SYSTEM

David Seymour

WVU Extension Agent – Pendleton County

Dave.Seymour@mail.wvu.edu 304-358-2286


Objective

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


GrowSafe System

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


GrowSafe System


Adapting to Goats:

Was a challenge


GrowSafe System(adaptive for goats)


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?

  • Feed Efficiency Data / Residual Feed Intake (RFI)


Understanding RFI and its Implications

Residual Feed Intake


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

  • 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?

  • 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

  • RFI (actual – expected)

    • Considerable individual animal variation in feed intake above and below what is expected based on size and growth


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 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

  • 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

  • The trial demonstrated the GroSafe feeding system with modifications can be used to test meat goats.


Questions??


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