Week 7
Dairy: Lactating Cows |
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Protein
Text
Transcript
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Protein Requirements
- Maintenance
- Growth
- Up 20% (1st lact) to 10% (2nd lact) above maintenance (0.2 lb/d)
- Milk Yield
- Reproduction
- 2 lb/d last two months of pregnancy
- Weight Gain
Protein Requirements
Protein in a Ruminant
Protein Fractions
- Rumen Degradable Protein (RDP)
- Degraded to ammonia by microbes
- Microbial growth is depends on amount of CHO fermented in the
rumen
- Microbial CP (g/day) = 0.130 x kg TDN
- Soluble protein (urea < 0.4 lb/d)
- Rumen Undegradable Protein (RUP)
- Pass from rumen to small intestine
Microbial Yield (Grams of Cells/Gram of Substrate) vs. pH
Response to RDP & RUP
Protein Fractions
Protein Supplements
Protein Supplements
| |
CP (% DM) |
Soluble (% CP) |
RDP (% CP) |
RUP (% CP) |
Brewers |
30 |
4 |
34 |
66 |
Canola |
40 |
32 |
63 |
37 |
CS Meal |
46 |
20 |
57 |
43 |
Distillers |
30 |
6 |
26 |
74 |
48% SBM |
55 |
20 |
65 |
35 |
RUP Sources
RUP Sources
Source |
CP (% DM) |
RUP (% CP) |
Blood Meal |
93 |
75 |
CG Meal |
67 |
59 |
Feather Meal |
86 |
70 |
Fish Meal |
67 |
65 |
Prolak |
72 |
66 |
Soy Plus |
47 |
55 |
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