Effect of Varying Dietary Crude Protein Level on Feed Intake, Nutrient Digestibility, Milk Production, and Nitrogen Use Efficiency by Lactating Holstein-Friesian Cows
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Experimental Animals
2.2. Treatment Diets and Experimental Design
2.3. Feeding Management and Measurements
2.4. Statistical Analysis
3. Results and Discussion
3.1. Feed Intake and Apparent Total-Tract Digestibility
3.2. Milk Yield, Components and Milk Components Yield
3.3. Milk N Secretion, and N Excretion in Feces and Urine
3.4. Optimal Dietary CP Level
4. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Concentrate | |||
---|---|---|---|
Ryegrass Silage | Low Protein | High Protein | |
Ingredient, % DM | |||
Wheat | 24.5 | 22.0 | |
Barley | 23.5 | 21.9 | |
Sugar beet pulp | 20.2 | 2.0 | |
Maize gluten | 12.5 | 4.0 | |
Soya bean hulls | 8.1 | 7.6 | |
Calcium salts of palm fatty acid | 2.7 | 1.6 | |
Rapeseed meal | 2.0 | 10.2 | |
Soya bean meal feed dehulled | 2.0 | 26.3 | |
Calcium carbonate | 1.4 | 1.4 | |
Acid Buf 1 | 1.4 | 1.4 | |
Sodium chloride | 0.7 | 0.7 | |
Super dairy 2 | 0.5 | 0.5 | |
Magnesium oxide | 0.3 | 0.3 | |
ActiSaf 3 | 0.1 | 0.1 | |
Chemical composition | |||
DM, g/kg | 336 ± 19.3 | 906 ± 5.2 | 903 ± 2.8 |
CP, g/kg DM | 154 ± 8.9 | 134 ± 2.9 | 252 ± 1.5 |
Rumen-degraded protein (RDP) 4, g/kg CP | 765 | 688 | 693 |
Rumen-undegraded protein (RUP) 4, g/kg CP | 235 | 312 | 307 |
NDF, g/kg DM | 554 ± 16.7 | 283 ± 10.5 | 243 ± 5.7 |
ADF, g/kg DM | 314 ± 12.9 | 134 ± 3.6 | 106 ± 10.6 |
Water-soluble carbohydrates (WSC), g/kg DM | 104 ± 1.1 | 55 ± 5.9 | 79 ± 1.9 |
Ash, g/kg DM | 81 ± 4.6 | 75 ± 4.2 | 81 ± 3.9 |
pH | 4.6 | - | - |
Total ammonia N, % total N | 6.6 | - | - |
Lactic acid, %DM | 12.2 | - | - |
Acetic acid, %DM | 3.8 | - | - |
Butyric acid, %DM | 0.57 | - | - |
Dietary CP Content, g/kg DM | ||||
---|---|---|---|---|
141 | 151 | 177 | 201 | |
Ingredient, % of TMR DM | ||||
Ryegrass silage | 47.3 | 47.9 | 47.7 | 47.5 |
Low protein concentrate | 52.7 | 43.0 | 22.0 | 3.0 |
High protein concentrate | 0.0 | 9.1 | 30.3 | 49.5 |
Chemical composition 1 | ||||
DM, g/kg | 507 | 513 | 510 | 508 |
CP, g/kg DM | 141 | 151 | 177 | 201 |
RDP, g/kg CP | 103 | 109 | 127 | 144 |
RUP, g/kg CP | 39 | 41 | 49 | 56 |
NDF, g/kg DM | 411 | 408 | 399 | 388 |
ADF, g/kg DM | 218 | 218 | 214 | 209 |
WSC, g/kg DM | 81 | 82 | 86 | 90 |
Ash, g/kg DM | 78 | 78 | 80 | 81 |
Dietary CP Content, g/kg DM | SEM | p-Value | ||||||
---|---|---|---|---|---|---|---|---|
141 | 151 | 177 | 201 | Diet | Linear | Quadratic | ||
DM intake, kg/day | ||||||||
Silage | 9.1 b | 9.1 b | 10.7 a | 9.4 b | 0.359 | 0.014 | 0.138 | 0.011 |
Concentrate | 10.1 b | 9.9 b | 11.8 a | 10.4 b | 0.383 | 0.012 | 0.147 | 0.017 |
Total | 19.2 b | 18.9 b | 22.5 a | 19.8 b | 0.730 | 0.011 | 0.136 | 0.013 |
OM intake, kg/day | 17.7 b | 17.4 b | 20.7 a | 18.2 b | 0.665 | 0.012 | 0.152 | 0.013 |
CP intake, kg/day | 2.72 b | 2.86 b | 3.98 a | 3.95 a | 0.132 | <0.0001 | <0.0001 | 0.015 |
NDF intake, kg/day | 7.91 b | 7.72 b | 8.98 a | 7.68 b | 0.309 | 0.026 | 0.700 | 0.015 |
ADF intake, kg/day | 4.19 b | 4.12 b | 4.83 a | 4.15 b | 0.183 | 0.039 | 0.516 | 0.021 |
Apparent total-tract digestibility | ||||||||
DM, g/kg | 707 | 719 | 715 | 715 | 13.1 | 0.890 | 0.773 | 0732 |
OM, g/kg | 728 | 737 | 737 | 734 | 12.6 | 0.922 | 0.778 | 0.624 |
CP, g/kg | 571 c | 611 b,c | 641 b | 695 a | 16.8 | 0.0002 | <0.0001 | 0.928 |
NDF, g/kg | 604 | 623 | 607 | 590 | 20.9 | 0.640 | 0.391 | 0.524 |
ADF, g/kg | 613 | 626 | 618 | 591 | 20.6 | 0.556 | 0.289 | 0.414 |
Dietary CP Content, g/kg DM | SEM | p-Value | ||||||
---|---|---|---|---|---|---|---|---|
141 | 151 | 177 | 201 | Diet | Linear | Quadratic | ||
Milk yield | ||||||||
Milk, kg/day | 23.7 b | 24.5 b | 28.6 a | 25.3 a,b | 1.29 | 0.048 | 0.153 | 0.044 |
4% FCM, kg/day | 25.6 | 26.6 | 31.1 | 28.1 | 1.56 | 0.094 | 0.114 | 0.079 |
Milk/DIM | 1.27 | 1.29 | 1.28 | 1.28 | 0.072 | 0.997 | 0.969 | 0.868 |
FCM/DIM | 1.37 | 1.40 | 1.40 | 1.41 | 0.082 | 0.987 | 0.754 | 0.920 |
Milk components | ||||||||
Fat, g/kg | 45.6 | 45.9 | 45.5 | 47.5 | 0.779 | 0.254 | 0.121 | 0.252 |
Lactose, g/kg | 47.8 | 47.9 | 47.7 | 48.3 | 0.600 | 0.910 | 0.682 | 0.627 |
Protein, g/kg | 34.1 c | 34.8 b,c | 37.2 a,b | 37.5 a | 0.834 | 0.023 | 0.004 | 0.359 |
Casein, g/kg | 27.1 b | 28.1 a,b | 28.7 a | 29.3 a | 0.475 | 0.029 | 0.005 | 0.445 |
Urea-N, mg/kg | 105 c | 110 c | 189 b | 205 a | 4.04 | <0.0001 | <0.0001 | 0.003 |
Milk components yield | ||||||||
Fat yield, kg/day | 1.09 | 1.16 | 1.22 | 1.21 | 0.059 | 0.383 | 0.151 | 0.323 |
Lactose yield, kg/day | 1.15 | 1.23 | 1.28 | 1.23 | 0.060 | 0.493 | 0.367 | 0.212 |
Protein yield, kg/day | 0.81 | 0.89 | 0.99 | 0.96 | 0.049 | 0.061 | 0.022 | 0.116 |
Casein yield, kg/day | 0.64 | 0.72 | 0.77 | 0.75 | 0.032 | 0.051 | 0.028 | 0.070 |
Urea-N yield, g/day | 2.52 b | 2.99 b | 5.05 a | 5.22 a | 0.233 | <0.0001 | <0.0001 | 0.007 |
Dietary CP Content, g/kg DM | p-Value | |||||||
---|---|---|---|---|---|---|---|---|
141 | 151 | 177 | 201 | SEM | Diet | Linear | Quadratic | |
Total N intake, g/day | 436 b | 457 b | 637 a | 633 a | 21.1 | <0.0001 | <0.0001 | 0.015 |
Urinary excretion | ||||||||
Urine output, kg/day | 18.5 b | 18.6 b | 24.7 a | 24.1 a | 0.978 | <0.0001 | <0.0001 | 0.054 |
Urinary N, g/day | 146 c | 156 c | 243 b | 287 a | 13.8 | <0.0001 | <0.0001 | 0.652 |
Urinary N, % N intake | 33.7 b | 35.0 b | 38.7 a,b | 45.6 a | 2.58 | 0.008 | 0.001 | 0.501 |
Fecal excretion | ||||||||
Fecal DM output, kg/day | 5.61 | 5.23 | 6.39 | 5.7 | 0.275 | 0.051 | 0.174 | 0.119 |
Fecal N, g/day | 185 b | 175 b | 234 a | 193 b | 11.8 | 0.016 | 0.110 | 0.023 |
Fecal N, % N intake | 42.2 a | 38.7 a,b | 36.7 b | 30.2 c | 1.55 | <0.0001 | <0.0001 | 0.551 |
Manure N, g/day | 331 b | 332 b | 480 a | 481 a | 22.7 | 0.0002 | <0.0001 | 0.116 |
Manure N, % N intake | 75.7 | 73.7 | 75.5 | 75.8 | 3.19 | 0.948 | 0.806 | 0.836 |
Milk N secretion | ||||||||
Milk N 1, g/day | 127 b | 138 a,b | 161 a | 149 a,b | 7.68 | 0.033 | 0.022 | 0.048 |
Milk N, % N intake | 29.6 a | 29.9 a | 25.5 a,b | 23.3 b | 1.62 | 0.021 | 0.003 | 0.953 |
Equation | Maximum 1 | p-Value 2 | ||||||
---|---|---|---|---|---|---|---|---|
Intake | ||||||||
DM, kg/day | = | −55.380 | + | 0.876 CP | − | 0.00249CP 2 | 176 | 0.013 |
OM, kg/day | = | −50.385 | + | 0.800CP | − | 0.00228CP 2 | 175 | 0.013 |
CP, kg/day | = | −12.008 | + | 0.160CP | − | 0.00040CP 2 | 200 | 0.015 |
NDF, kg/day | = | −18.823 | + | 0.318CP | − | 0.00092CP 2 | 173 | 0.015 |
ADF, kg/day | = | −8.400 | + | 0.149CP | − | 0.00043CP 2 | 173 | 0.021 |
Milk yield | ||||||||
Milk, kg/day | = | −116.980 | + | 1.652CP | − | 0.00470CP 2 | 176 | 0.044 |
4% FCM, kg/day | = | −133.510 | + | 1.860CP | − | 0.00526CP 2 | 177 | 0.079 |
Milk components | ||||||||
Urea-N, mg/kg | = | −940.340 | + | 11.152 | − | 0.02711CP 2 | 206 | 0.003 |
Milk components yield | ||||||||
Casein yield, kg/day | = | −4.358 | + | 0.058CP | − | 0.00016CP 2 | 182 | 0.070 |
Urea-N yield, g/day | = | −50.378 | + | 0.596CP | − | 0.00159CP 2 | 187 | 0.007 |
N excretion | ||||||||
Urine output, kg/day | = | −97.997 | + | 1.315CP | − | 0.00352CP 2 | 187 | 0.054 |
Fecal N, g/day | = | −1290.370 | + | 17.312CP | − | 0.04927CP 2 | 176 | 0.023 |
Milk N, g/day | = | −475.590 | + | 6.927CP | − | 0.01893CP 2 | 183 | 0.048 |
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Katongole, C.B.; Yan, T. Effect of Varying Dietary Crude Protein Level on Feed Intake, Nutrient Digestibility, Milk Production, and Nitrogen Use Efficiency by Lactating Holstein-Friesian Cows. Animals 2020, 10, 2439. https://doi.org/10.3390/ani10122439
Katongole CB, Yan T. Effect of Varying Dietary Crude Protein Level on Feed Intake, Nutrient Digestibility, Milk Production, and Nitrogen Use Efficiency by Lactating Holstein-Friesian Cows. Animals. 2020; 10(12):2439. https://doi.org/10.3390/ani10122439
Chicago/Turabian StyleKatongole, Constantine Bakyusa, and Tianhai Yan. 2020. "Effect of Varying Dietary Crude Protein Level on Feed Intake, Nutrient Digestibility, Milk Production, and Nitrogen Use Efficiency by Lactating Holstein-Friesian Cows" Animals 10, no. 12: 2439. https://doi.org/10.3390/ani10122439