The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey
Greenhouse gas (GHG) emissions from livestock are an important consideration in environmental science. Estimating GHG production can be problematic at a farm or animal level, and requires controlled conditions to produce real data. An in vitro gas production technique (IVGPT) was developed to evalua...
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Brill
2021-08-01
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| Series: | Journal of Applied Animal Nutrition |
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| Online Access: | https://www.wageningenacademic.com/doi/10.3920/JAAN2021.0006 |
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| author | N.D. Meads R. Tahmasbi N. Jantasila |
| author_facet | N.D. Meads R. Tahmasbi N. Jantasila |
| author_sort | N.D. Meads |
| collection | DOAJ |
| description | Greenhouse gas (GHG) emissions from livestock are an important consideration in environmental science. Estimating GHG production can be problematic at a farm or animal level, and requires controlled conditions to produce real data. An in vitro gas production technique (IVGPT) was developed to evaluate forage-based total mixed rations in digestion kinetics and GHG production. Two hundred and sixty samples of complete mixed rations (MR), which included a pasture component used in commercial lactating dairy herds, were collected around NZ across three calendar years, 2017-2019. Twenty of the 260 samples were 100% total mixed rations (TMR) with no pasture content. The samples were submitted for proximate analysis as well as IVGPT to generate GHG production figures. The results showed an average total gas production (TGP) of 129.82 ml/g dry matter (DM), 78.6% true digestibility (TDMD), 125.06 mg/g DM microbial biomass (MB), 20.16 g CH4/kg DM, and 12.8 MJME/kg DM. The average nutrient composition was dry matter (DM) 31.55%, crude protein (CP) 21.85%, neutral detergent fibre (NDF) 44.35%, and starch 7.03%. The IVGPT CH4 production was negatively correlated to NDF (r=-0.312), ADF (r=-0.193), TGP (r=-0.216), and was positively correlated with TDMD (r=0.250), apparent digestibility (ADMD) (r=0.614), starch (r=0.117) and volatile fatty acids (r=0.538). The MR diet showed a strong positive relationship with ADMD digestibility (P=0.01) and a negative relationship with fibre content (NDF, P=0.01 and ADF, P=0.01). However, CH4 production reduced linearly with increasing TGP (P=0.01). The results indicated that a greater CH4 production may be related to higher digestibility of mixed ration. |
| format | Article |
| id | doaj-art-6dfc38a4e4e44596accd3ada73cd894c |
| institution | Kabale University |
| issn | 2049-257X |
| language | English |
| publishDate | 2021-08-01 |
| publisher | Brill |
| record_format | Article |
| series | Journal of Applied Animal Nutrition |
| spelling | doaj-art-6dfc38a4e4e44596accd3ada73cd894c2025-01-02T22:46:40ZengBrillJournal of Applied Animal Nutrition2049-257X2021-08-01929910310.3920/JAAN2021.0006The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical surveyN.D. Meads0R. Tahmasbi1N. Jantasila2Alltech New Zealand, P.O. Box 69 170, Glendene, Auckland 0645, New Zealand.Alltech Lienert Australia, 8 Roseworthy Road, Roseworthy SA 5371, Australia.Alltech New Zealand, P.O. Box 69 170, Glendene, Auckland 0645, New Zealand.Greenhouse gas (GHG) emissions from livestock are an important consideration in environmental science. Estimating GHG production can be problematic at a farm or animal level, and requires controlled conditions to produce real data. An in vitro gas production technique (IVGPT) was developed to evaluate forage-based total mixed rations in digestion kinetics and GHG production. Two hundred and sixty samples of complete mixed rations (MR), which included a pasture component used in commercial lactating dairy herds, were collected around NZ across three calendar years, 2017-2019. Twenty of the 260 samples were 100% total mixed rations (TMR) with no pasture content. The samples were submitted for proximate analysis as well as IVGPT to generate GHG production figures. The results showed an average total gas production (TGP) of 129.82 ml/g dry matter (DM), 78.6% true digestibility (TDMD), 125.06 mg/g DM microbial biomass (MB), 20.16 g CH4/kg DM, and 12.8 MJME/kg DM. The average nutrient composition was dry matter (DM) 31.55%, crude protein (CP) 21.85%, neutral detergent fibre (NDF) 44.35%, and starch 7.03%. The IVGPT CH4 production was negatively correlated to NDF (r=-0.312), ADF (r=-0.193), TGP (r=-0.216), and was positively correlated with TDMD (r=0.250), apparent digestibility (ADMD) (r=0.614), starch (r=0.117) and volatile fatty acids (r=0.538). The MR diet showed a strong positive relationship with ADMD digestibility (P=0.01) and a negative relationship with fibre content (NDF, P=0.01 and ADF, P=0.01). However, CH4 production reduced linearly with increasing TGP (P=0.01). The results indicated that a greater CH4 production may be related to higher digestibility of mixed ration.https://www.wageningenacademic.com/doi/10.3920/JAAN2021.0006in vitro rumen fermentationdigestion kineticsdairy performancemethane production |
| spellingShingle | N.D. Meads R. Tahmasbi N. Jantasila The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey Journal of Applied Animal Nutrition in vitro rumen fermentation digestion kinetics dairy performance methane production |
| title | The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey |
| title_full | The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey |
| title_fullStr | The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey |
| title_full_unstemmed | The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey |
| title_short | The nutritional evaluation of forage-based mixed rations in New Zealand using an in vitro gas production technique. 1: analytical survey |
| title_sort | nutritional evaluation of forage based mixed rations in new zealand using an in vitro gas production technique 1 analytical survey |
| topic | in vitro rumen fermentation digestion kinetics dairy performance methane production |
| url | https://www.wageningenacademic.com/doi/10.3920/JAAN2021.0006 |
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