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What are Lead Factors?
- A method used to enhance the group average milk production per day by formulating lactation rations to facilitate a higher milk production level than the average of the latation group.
- Feeding to the greatest producing cow
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What is the Lead Factor for a 1 group system?
30% lead Factor or 1.3
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What is the Lead Factor for a 2 group system?
20% lead factor or 1.2
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What is the Lead Factor for a 3 group system?
10% Lead Factor or 1.1
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Draw the the Lactation curve, the dry matter intake curve and th body wight loss and gain curve of a dairy cow. diagram each curve and explain the significance of the curves during the three phases of the lactation period.
draw
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Name the six phases of a producing dairy cow during a calendar year.
- Phase 1: Far-off, 1st 45+ days dry
- Phase 2: Close-up, Last 14-21 days dry
- Phase 3: Fresh, 0 -14 days of Lactation
- Phase 4: Peak Milk, 14 - 70 days of lactation
- Phase 5: Peak DMI, 70 - 140 days of lactation
- Phase 6: Late Lactation, 140 - 305 days of lactation
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On Lactation curve chart what phase startes at month 0?
Phase 3: Fresh, 0-14 days
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On the lactation curve chart what is the second phase, what is its begininning month and ending month?
- Phase 4 Peak Milk 14 -70 days
- Starts middle of month 1
- ends just before month 3
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On the Lactation curve chart what is the third phase, when does it start and finish?
- Phase 5 Peak DMI, 70 - 140
- start just before third month
- ends just before 7th month
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On the Lactation curve chart what is the fourth phase, when does it start and finish?
- Phase 4 late Lactation, 140 - 305 days
- start just before the 7th month
- finishes just before the 10th month
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On the Lactation curve chart what is the fifth phase, when does it start and finish?
- Phase 1 Far-off, 1st 45+ days dry
- starts just before the 10th month
- ends at the 11th month
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On the Lactation curve chart what is the six than final phase, when does it start and finish?
- Phase 2 Close-up, last 14 - 21 days dry
- starts month 11
- Ends month 12
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During phase 4 Peak milk what month does production peak on the Lactation curve chart?
Month 2, same time body weight loss turn into gain
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During phase 5 "peak DMI" what month does intake peak on the lactation curve chart?
Month 5
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During phase 4 "peak milk" 14-70 days when does body weight begin to increase again on the Lactation curve chart?
Month 2, same time as milk production peaks
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During which period of production cycle do peak milk yeilds occur?
Phase 4 "Peak milk" 14-70 days
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During which period of the production cycle do peak dry matter intakes occur?
Phase 5 "Peak DMI" day 70-140
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Body wight decreases to the largest extent during the first 70 days of lactation. Why?
- Negative Energy Balance
- due to depressed DMI or greater nutrient requirements for milk production in early lactation
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