Methane Emission and Milk Production of Dairy Cows Grazing Pastures Rich in Legumes or Rich in Grasses in Uruguay
Abstract
:Simple Summary
Abstract
1. Introduction
2. Materials and Methods
2.1. Experimental Treatments and Design
2.2. Herbage Measurement
2.3. Digestibility Trial
2.4. Measurements on Dairy Cows
2.5. Chemical Analysis
2.6. Statistical Analysis
3. Results and Discussion
3.1. Sward Characteristics and Herbage Defoliated
1 Above the motor scythe cutting height (5 cm). | |||
Pasture treatment | |||
Sward parameters | Legume | Grass | P |
Herbage mass (kg DM/ha) | 4,335 | 3,499 | 0.0002 |
Herbage mass above 5 cm (kg DM/ha) | 2,309 | 2,021 | 0.2201 |
Sward height (cm) | 31 | 28 | 0.5153 |
Botanical composition 1 | |||
Grass/Legume ratio (%DM) | 40/60 | 76/24 | <0.0001 |
Chemical composition 1 (g/kg DM) | |||
DM (g/kg) | 276 | 384 | 0.0008 |
OM (g/kg DM) | 920 | 903 | 0.0461 |
CP | 204 | 102 | <0.0001 |
Condensed tannins | 4.6 | 2.8 | 0.0205 |
aNDFom | 469 | 540 | 0.0260 |
ADFom | 265 | 312 | 0.0618 |
Lignin (sa) | 76 | 62 | 0.1149 |
GE (kJ/kg DM) | 18.1 | 16.7 | 0.0017 |
In vivo digestibility 1 (g/kg) | |||
DM | 689 | 616 | 0.0006 |
OM | 698 | 659 | 0.0103 |
aNDFom | 633 | 566 | 0.0016 |
ADFom | 525 | 489 | 0.1516 |
Pasture treatment | |||
Legume | Grass | P | |
Herbage allowance 1,2 (kg DM/ cow/day) | 35 | 45 | 0.0226 |
Depth of defoliation (cm) | 11 | 8 | 0.6436 |
Herbage utilization 1 (%) | 46 | 37 | 0.2650 |
Chemical composition 1 (g/kg DM) | |||
DM (g/kg) | 894 | 898 | 0.4399 |
OM | 923 | 926 | 0.4481 |
CP | 180 | 133 | 0.0225 |
Condensed tannins | 2.2 | 2.5 | 0.5119 |
aNDFom | 464 | 482 | 0.6946 |
ADFom | 264 | 259 | 0.8578 |
Lig (sa) | 47 | 38 | 0.0582 |
GE (kJ/kg DM) | 18.7 | 19.0 | 0.5954 |
3.2. Herbage Intake at Grazing
Pastures treatment | |||
Legume | Grass | P | |
Faecal output (kg OM/d) | 4.5 | 4.6 | 0.8476 |
Herbage OM digestibility (g/kg OM) | 711 | 704 | 0.1996 |
Herbage OM intake (kg/cow/day) | 15.9 | 15.5 | 0.7558 |
Herbage DM intake (kg/cow/day) | 17.3 | 16.8 | 0.7556 |
Total digestible OM intake (kg/cow/day) | 11.4 | 10.9 | 0.6191 |
3.3. Milk Production and Composition, and Live Weight Variation
Pastures treatment | |||
Legume | Grass | P | |
Milk yield (kg/cow/day) | 20.7 | 19.9 | 0.7508 |
Fat content (g/kg) | 37.7 | 36.5 | 0.5030 |
Fat yield (g/day) | 772 | 711 | 0.3630 |
Protein content (g/kg) | 34.0 | 32.5 | 0.1068 |
Protein yield (g/day) | 699 | 636 | 0.3728 |
Fat corrected milk (FCM 4%) (kg/cow/day) | 19.9 | 18.7 | 0.5173 |
Live weight variation (kg/cow) | +12 | +20 | 0.2317 |
3.4. Methane Emission and Methane Yield
Pastures treatment | |||
Legume | Grass | P | |
Methane emission (g/cow/day) | 364 | 372 | 0.7237 |
Methane emission (L/cow/day) | 510 | 521 | |
Methane emission (g/kg FCM 4%) | 18.6 | 20.6 | 0.3517 |
Methane yield | |||
as Gross Energy intake (Ym) | 6.4 | 6.7 | 0.5971 |
as g methane/kg DMI | 21.6 | 22.7 | 0.5821 |
4. Conclusions
Acknowledgments
Conflict of Interest
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Dini, Y.; Gere, J.; Briano, C.; Manetti, M.; Juliarena, P.; Picasso, V.; Gratton, R.; Astigarraga, L. Methane Emission and Milk Production of Dairy Cows Grazing Pastures Rich in Legumes or Rich in Grasses in Uruguay. Animals 2012, 2, 288-300. https://doi.org/10.3390/ani2020288
Dini Y, Gere J, Briano C, Manetti M, Juliarena P, Picasso V, Gratton R, Astigarraga L. Methane Emission and Milk Production of Dairy Cows Grazing Pastures Rich in Legumes or Rich in Grasses in Uruguay. Animals. 2012; 2(2):288-300. https://doi.org/10.3390/ani2020288
Chicago/Turabian StyleDini, Yoana, José Gere, Carolina Briano, Martin Manetti, Paula Juliarena, Valentin Picasso, Roberto Gratton, and Laura Astigarraga. 2012. "Methane Emission and Milk Production of Dairy Cows Grazing Pastures Rich in Legumes or Rich in Grasses in Uruguay" Animals 2, no. 2: 288-300. https://doi.org/10.3390/ani2020288