Relationship between in vitro and in vivo methane production measured simultaneously with different dietary starch sources and starch levels in dairy cattle
| Autor: | Hatew, B., Cone, J. W., Pellikaan, W. F., Podesta, S. C., Bannink, A., Hendriks, W. H., Dijkstra, J., LS Voeding, Faculty of Veterinary Medicine Research Groups, Advances in Veterinary Medicine, FAH AVM |
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| Přispěvatelé: | LS Voeding, Faculty of Veterinary Medicine Research Groups, Advances in Veterinary Medicine, FAH AVM |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Animal Nutrition
Silage Starch ruminal fermentation Starch fermentability volatile fatty-acids Randomized block design Rumen chemistry.chemical_compound Animal science In vitro fermentation characteristics Botany In vivo Dairy cow Dry matter production profiles Beet pulp Dairy cattle degradation gas-production technique emissions food and beverages Diervoeding rumen microbial-population chemistry kinetics WIAS Departement Dierwetenschappen Fermentation Animal Science and Zoology protein Methane Department of Animal Sciences |
| Zdroj: | Animal Feed Science and Technology, 202, 20. Elsevier Animal Feed Science and Technology, 202, 20-31 Animal Feed Science and Technology 202 (2015) |
| ISSN: | 0377-8401 |
| Popis: | To investigate the relationship between in vitro and in vivo methane (CH4) production measured simultaneously using the same rumen-fistulated cows in both experiments, four dietary treatments based on concentrate that accounted for 400g/kg of the mixed diet DM, were formulated to contain starch varying in rate of fermentation (slowly (S) vs. rapidly (R): native vs. gelatinized maize grain) and level of inclusion (low (L) vs. high (H): 270 vs. 530g/kg of concentrate DM). Sixteen rumen-fistulated lactating dairy cows were used in a complete randomized block design with these treatments replicated in four periods of 17d each. In experiment 1, after 12d of adaptation, the cows were housed in respiration chambers for 5d to measure CH4 production. In experiment 2, in each period in vitro gas and CH4 production were measured (in duplicate per period) for mixed diet samples from the same diet as fed to the donor cows using rumen inocula adapted to the respective diets for an average of 16d. In addition, samples of two concentrate ingredients, viz. grass silage and beet pulp, were incubated with four different inocula obtained from individual donor cows. Gas production (GP) was measured using automated GP system with CH4 measured at distinct time points. In vitro (24-h) CH4 production of mixed diet was lower with R than S (42.9 vs. 49.5ml/g of incubated organic matter (OM); P=0.004), and higher with L than H (49.8 vs. 42.6ml/g of incubated OM; P=0.002). A significant interaction effect between source and level of starch (P=0.015) was also found, indicating the CH4 production of the RH diet decreased in particular. In vivo, an increased rate of starch fermentation resulted in a lower CH4 per unit of estimated rumen-fermentable OM (eRFOM; 55.6 vs. 61.2ml/g of eRFOM; P=0.007), and higher level of starch tended (P=0.089) to reduce CH4 per unit of eRFOM, but dietary starch level and source did not affect CH4 per unit of OM consumed. Across the diets tested, 24-h in vitro CH4 (ml/g of incubated OM) correlated well with in vivo CH4 expressed per unit of eRFOM (R2=0.54; P=0.040), but not when expressed per unit of OM ingested (R2=0.04; P=0.878). For grass silage (the same trend for beet pulp), inocula adapted to R- and H-based diets compared with S- and L-based diets resulted in a lower CH4 production (36.1 vs. 44.8ml/g of incubated OM, R vs. S; and 37.4 vs. 43.4ml/g of incubated OM, H vs. L; P |
| Databáze: | OpenAIRE |
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