“knowing the growth efficiency potential in the lamb crop ”
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“Knowing the Growth Efficiency Potential in the Lamb Crop ”. Dr. Jeff Held South Dakota State University. Flock Management Goals. High ewe reproductive efficiency genetics, nutrition and health Lower unit cost of production reduce feed cost – ewe flock - PowerPoint PPT PresentationTRANSCRIPT
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“Knowing the Growth Efficiency Potential in the
Lamb Crop ”
Dr. Jeff HeldSouth Dakota State
University
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Flock Management Goals
High ewe reproductive efficiency genetics, nutrition and health
Lower unit cost of production reduce feed cost – ewe flock
feed efficiency (F/G) and cost of gain – lamb performance
Lower labor requirementfacilities and feeding managementmore mechanical applications
Risk/marketing management enter marketing agreementsutilize wool LDP and LRP-Lamb
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Lamb Feed Efficiency and Cost of Gain
• Growth performance (ADG)
• Optimum economic finished weight (YG2/3)
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Growth Performance (ADG)
• Genetics / Frame size– Growth trait selection– Crossbreeding (hybrid vigor)
• Sex of animal – R>W>E
• Age
• Health status
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AVERAGE DAILY GAIN
0
0.2
0.4
0.6
0.8
1
1.2
0 20 40 60 80 100 120 130 140 150
Dai
ly G
ain
(lb
)
Live Weight (lb)
Large Frame
Small Frame
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Ave Wt = 91 lb
Sire and Dam were a Wool Breed
No Crossbreeding
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Ave Wt = 99 lb
-Terminal Breed Sired
-Heterosis (6%)
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Heritability of Selected Traits
Lambs born per ewe lambing 10
Pounds of lamb weaned per exposed ewe 20
120 Day weight 20
Post Weaning Gain (60-120 days) 25
Weight of trimmed retail cuts 45
Loin eye area 35
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How do you select the the best terminal sire?
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Terminal SireFarm Flock Performance Information
Individual Sire Performance - Hampshire
ID B Date B Type W Type WW 120- D Wt
WDA PW ADG
301 1/24 S S 110 199 1.66 1.48
201 1/24 TW TW 61 138 1.15 1.28
0.51 0.20
Exp Diff. 0.13 .05
*Pipestone LW Sire Evaluation
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Terminal SireFarm Performance Information
Hampshire Sired Progeny Performance
ID WW Adj. WW Market Wt
Rate of Gain
Days to Market
301 59.4 56 130 0.92 141
201 57.2 54.7 128 0.82 147
*Pipestone LW Sire Evaluation
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Lamb Feed Efficiency (F:G)
Feed
Efficiency
Pounds of
Feed Intake
Cost/
Lamb
Average Daily Gain
Days to Market
4.5:1 270 27.00 1.00 60
5.0:1 300 30.00 0.90 67
5.5:1 338 33.80 0.80 75
6.5:1 387 38.70 0.70 86
7.5:1 450 45.00 0.60 100
9.0:1 540 54.00 0.50 120
Assume Feed Intake 4% BW @ 4.5 lb/hd/d
Feed cost = $0.10 per pound ($200/ton)
Pounds gained = 60 lb (80 lb feeder lamb fed to 140 lb)
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Cost of Gain (CG)
Expression 1 = cents/pound of gain
Expression 2= (feed cost(cents/lb)) * (daily feed intake, lb)
average daily gain (ADG), lbExpression 3
= feed cost(cents/lb) * feed efficiency (F:G)
*CG=Economic Expression For Feed Efficiency
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Key Variables in Cost of Gain
• Feed Costs– Price ingredients on nutrient basis (E, CP)– For every 1% CP + $10-15 per ton– Nutritionally sound and palatable
• Feed Efficiency (F:G)– Ad lib feed intake at 4% of body weight– Growth performance (ADG)
**CG equally affected by $15/ton = 0.1 ADG
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Standard - Corn and Protein Pellet
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Mixed Ingredient Finishing Diet
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Mixed Lamb Finishing Diet - DDGS
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Mixed Diet with DDGS
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High Forage Lamb Diet
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Whole Corn
MDGS
Liquid Supplement
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Relationship of Cost of Gain and Optimum Finished Weight
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USDA Lamb Yield Grades
Yield Grade % Cutability Adj. Fat Depth
1 51.0 0.00-0.15
2 49.7 0.16-0.25
3 48.4 0.26-0.35
4 47.1 0.36-0.45
5 45.8 over 0.45
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USDA YG 2
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USDA YG 4
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Predicting Optimum Economic Lamb Finished Weight
• Following graph illustrates the relationship of dam weights on predicting lamb finished weight at constant lamb carcass merit.
USDA Yield grade 1 (0.15 in. adj. fat depth)
• Average mature weight of the dams for both the ewe and sire breed multiplied by 64 %. (mature body size)For example: Suffolk = 210 lb Hampshires = 190 lb Suffolk-Hamp cross lambs would have a predicted finished weight: ((210+190)/2) x 0.64 = 128 lb
**For every 10 lb increase = 0.1 in. more fat depth
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Using Dam Frame Size to Predict Lamb Finished Weight
Sire Breed Mature Ewe Weight (lb)
Ew
e Breed M
ature Ew
e Weight
(lb)
220 200 180 160 140 120
220 141 135 129 123 117 111
200 135 129 123 117 111 105
180 128 122 116 110 104 98
160 122 116 110 104 98 92
140 115 109 103 97 91 85
120 109 103 97 91 85 79
110 106 100 94 88 82 76
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LAMB PROFIT POTENTIAL
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Price Hist
Cost of gain
Cost of gainSmall frame
Large frame
Live Weight (lb)
Cos
t of
Gai
n/V
alu
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YG 2/3
Frame size
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2007 SDSU She ep S ale Educati on Pr og ra m
LAMB PROFIT POTENTIAL
Live Weight
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st o
f G
ai n
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lue
per
lb
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CG 09 LgFrameCG 07 LgFrame
Large Frame
YG 2/3 YG 2/3
Profit
Feed Cost
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LAMB PROFIT POTENTIAL
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Price Hist
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Live Weight
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Large Frame
YG 1-2
Live Price
YG 2-3
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Key Points:Lamb Profit Potential
• Optimum profit – when live price and cost of gain are equal!!
• Profit – CG less than live price
• Loss – CG greater than live price» ADG less than 0.6 lb/day
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Lamb Profit Summary
• Degree of finish (YG) is an indicator for optimum economic finished weight – 0.25-.30 in. fat depth (YG 2/3)
• Frame-size is the most significant factor to determine the optimum finished weight– Impact on average daily gain
• cost of gain
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Overall Summary
Feed efficiency (F:G) is the profit generator. Growth performance (ADG) is the key variable
in F:G. Select superior growth genetics. Utilize hybrid vigor for growth performance. Recognize the relationship between growth
efficiency, cost of gain and carcass merit. -”Lamb Profit Potential”
Lambs are not created equal!!!
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Questions???????