[PMID]: | 28237592 |
[Au] Autor: | Klop G; Dijkstra J; Dieho K; Hendriks WH; Bannink A |
[Ad] Endereço: | Animal Nutrition Group, Wageningen Livestock Research, Wageningen University and Research, PO Box 338, 6700 AH Wageningen, the Netherlands. |
[Ti] Título: | Enteric methane production in lactating dairy cows with continuous feeding of essential oils or rotational feeding of essential oils and lauric acid. |
[So] Source: | J Dairy Sci;100(5):3563-3575, 2017 May. |
[Is] ISSN: | 1525-3198 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Rumen microbes can adapt to feed additives, which may make the decrease in enteric CH production upon feeding an additive a transient response only. This study investigated alternate feeding of 2 CH mitigating feed additives with a different mode of action on persistency of lowering CH production compared with feeding a single additive over a period of 10 wk. Four pairs of cows were selected, and within pairs, cows were randomly assigned to either the control (AR-AR) or the alternating (AR-LA) concentrate treatment. The AR concentrate contained a blend of essential oils (Agolin Ruminant, Agolin SA, Bière, Switzerland; 0.17 g/kg of dry matter) and the LA concentrate contained lauric acid (C12:0; 65 g/kg of dry matter). A basal concentrate without Agolin Ruminant and lauric acid was fed during the pretreatment period (2 wk). Thereafter, the cows assigned to the AR-AR treatment received the AR concentrate during all 10 treatment weeks (5 periods of 2 wk each), whereas cows assigned to the AR-LA treatment received AR and LA concentrates rotated on a weekly basis. Methane emission was measured in climate respiration chambers during periods 1, 3, and 5. From period 3 onward, dry matter intake and milk protein concentration were reduced with the AR-LA treatment. Milk fat concentration was not affected, but the proportion of C12:0 in milk fat increased upon feeding C12:0. Molar proportions of acetate and propionate in rumen fluid were lower and higher, respectively, with the AR-LA than with the AR-AR treatment. Methane yield (g/kg of dry matter intake) and intensity (g/kg of fat- and protein-corrected milk yield) were not affected by treatment. Methane yield and intensity were significantly lower (12 and 11%, respectively) in period 1 compared with the pretreatment period, but no significant difference relative to pretreatment period was observed in period 3 (numerically 9 and 7% lower, respectively) and in period 5 (numerically 8 and 4% lower, respectively). Results indicate a transient decrease in CH yield and intensity in time, but no improvement in extent or persistency of the decline in CH due to rotational feeding of essential oils and C12:0 in lactating dairy cows. |
[Mh] Termos MeSH primário: |
Lactação Óleos Voláteis/metabolismo
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[Mh] Termos MeSH secundário: |
Ração Animal Animais Bovinos Dieta/veterinária Feminino Ácidos Láuricos Metano/biossíntese Leite/metabolismo Rúmen/metabolismo
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[Pt] Tipo de publicação: | JOURNAL ARTICLE; RANDOMIZED CONTROLLED TRIAL |
[Nm] Nome de substância:
| 0 (Lauric Acids); 0 (Oils, Volatile); OP0UW79H66 (Methane) |
[Em] Mês de entrada: | 1705 |
[Cu] Atualização por classe: | 170522 |
[Lr] Data última revisão:
| 170522 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 170227 |
[St] Status: | MEDLINE |
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