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Developmental Stages of Lambs
Dr. Dan Morrical Iowa State University
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Development Stages of Lamb Digestive System
Birth - 3 weeks pre-ruminant 3-8 weeks - psuedo ruminant 8 weeks & on - ruminant
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Birth: Solely dependent on milk
Composition of ewes milk: 18.2% dry matter 5-7% fat 24.7% crude protein 26.4% lactose 1400 IU / liter Vit A 15 IU / liter Vit E
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Milk Yield and Composition Impact Lamb Performance
•Higher milk fat leads to increase energy intake •ISU creep trials: 16, 21 & 26% CP No variation in performance •Megalac increases milk fat
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Creep Diets Palatable -Corn -Soybean meal -Molasses -DDGS
-Soybean hulls Roughage is of minimal value Lambs get adequate roughage intake from ewe diets
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Creep Diets •Easily digestible •15-20% crude protein •Added fat
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Creep Ration Corn 1470 SBM 49% 370 Molasses 100 Limestone 40
Big GainTM salt 10 Ammonium Chloride 10 CTC 50 grams Selenium .2 grams Vitamin A 1,000,000 IU Vitamin D 100,000 IU Vitamin E 50,000 IU Zinc 136 grams Crude protein 16.7% TDN 83.4% Calcium .84% Phosphorous .38%
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Ration Physical Characterics
Very young lambs Meal form 3-8 weeks Medium grind 8-12 weeks Coarse grind >12 weeks Whole grains
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Nutrient Requirements
Factors : Sex Lean Growth Potential Weight
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Composition of Gain Rams Lambs Superior Wethers Intermediate
Ewe Lambs Poorest
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Mature Size Lambs are market ready at 65% of average mature weight of ewes of parent breeds. 220 lb. sire lb. dam = 400 ÷ 2 = 200. 200 x .65% = 130.
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% Protein Concentration of Lamb Rations
ADG Lamb Wt
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Protein Quantity and Quality
Very young lambs - solely dependent on feed protein for quality and quantity Ruminant -Protein quality depends on Feed origin Bacterial origin
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Ruminant - Protein Quantity
•Intake •Microbial yield -impacted by energy intake -rumen ammonia level -liquid dilution rate
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Rumen Bacteria Cellulolytic - Fiber digesters
Amylolytic - Starch digesters Proteolytic - Bacterial protein digesters
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Lamb Intake Controlled by: Low concentrate diets -- fill
Energy Low concentrate diets -- fill High concentrate diets -- energy
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Specific Nutrients Vit E. 40,000 IU/ton Se .3 ppm Ca .48 P .24
Salt %
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What Type of Ration 1. Targeted marketing date.
2. Relative costs of nutrients. 3. Compositional goal. 4. Facility size. 5. Feed processing equipment & storage. 6. Feeding system.
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Simplest System Whole corn: Pelleted Protein Supplement. Advantages:
-Superior feed efficiency -Self fed -Low processing costs -Low cost diet -Acidosis risk
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Simplest System...continued
Disadvantages: -Sorting -Slower gains -Quality of protein supplement -Cash expense for protein pellet
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High Hay Rations Advantages: -Minimal cash outlay
-Value added to hay crop -Improved composition Disadvantages: -Lower ADG -More facilities, bunks and pens -Hay waste
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Weaned Lamb Performance on Grass
Factors - Forage Species Grass vs. legumes -Age of lamb -Health of lambs -Condition of lambs
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Lamb Gains on Straight Grass
pounds per day w/pound supplementation Conversion 1:10 to 1:5
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Escape Protein for Pasture Lambs
Sources: •Blood Meal •Fish Meal •Corn Gluten Meal
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Nursing Lamb Performance on Grass
Milk Production is Key 1. Rotational grazing a. high quality and quantity of forage b. reduced competition between ewe & offspring 2. Creep Feeding a. improved growth b. allows coccidia control c. increases cost of production
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Internal Parasite Control Strategies
1. Clean pasture 2. Clean sheep 3. Sheep age & resistance
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Clean Pasturers 1. Not grazed by sheep for six months.
Hay ground Cattle pasture 2. Rotate sheep & cattle middle of growing season. 3. Turn our clean sheep to minimize contamination.
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Clean Sheep Older sheep are more resistant.
Young lambs evaluate frequently until 6 months of age. Treat before turn-out, retreat at 21-days. Multiple water sources.
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Coddidia Control 1. Multiple water sources 2. Ionophores in mineral ?
3. Clean out ewes prelambing 4. Clean water source
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