Performance and methane emissions in dairy cows fed oregano and green tea extracts as feed additives.
| Autor: | Kolling GJ; Department of Veterinary Medicine, Escola de Medicina Veterinária University Center FACVEST and IMED, Passo Fundo, 99070-220, Rio Grande do Sul, Brazil., Stivanin SCB; Department of Animal Science, Universidade Federal do Rio Grande do Sul, Porto Alegre, 91540-000, Rio Grande do Sul, Brazil., Gabbi AM; Department of Animal Science, Universidade Federal do Rio Grande do Sul, Porto Alegre, 91540-000, Rio Grande do Sul, Brazil., Machado FS; Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Juiz de Fora, 36038-330, Minas Gerais, Brazil., Ferreira AL; Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Juiz de Fora, 36038-330, Minas Gerais, Brazil; Universidade Federal de São João del Rei, São João del Rei, 36307-352, Minas Gerais, Brazil., Campos MM; Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Juiz de Fora, 36038-330, Minas Gerais, Brazil., Tomich TR; Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Juiz de Fora, 36038-330, Minas Gerais, Brazil., Cunha CS; Doctor in Animal Science from Universidade Federal de Viçosa, Viçosa, 36570-000, Minas Gerais, Brazil., Dill SW; Integrated Residency Program in Veterinary Medicine, Universidade Federal do Pampa, Uruguaiana, 97504210, Rio Grande do Sul, Brazil., Pereira LGR; Brazilian Agricultural Research Corporation, Embrapa Dairy Cattle, Juiz de Fora, 36038-330, Minas Gerais, Brazil., Fischer V; Department of Animal Science, Universidade Federal do Rio Grande do Sul, Porto Alegre, 91540-000, Rio Grande do Sul, Brazil. Electronic address: vivinha.fischer@hotmail.com. |
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| Jazyk: | angličtina |
| Zdroj: | Journal of dairy science [J Dairy Sci] 2018 May; Vol. 101 (5), pp. 4221-4234. Date of Electronic Publication: 2018 Feb 21. |
| DOI: | 10.3168/jds.2017-13841 |
| Abstrakt: | Plant extracts have been proposed as substitutes for chemical feed additives due to their potential as rumen fermentation modifiers and because of their antimicrobial and antioxidant activities, possibly reducing methane emissions. This study aimed to evaluate the use of oregano (OR), green tea extracts (GT), and their association as feed additives on the performance and methane emissions from dairy between 28 and 87 d of lactation. Thirty-two lactating dairy cows, blocked into 2 genetic groups: 16 Holstein cows and 16 crossbred Holstein-Gir, with 522.6 ± 58.3 kg of body weight, 57.2 ± 20.9 d in lactation, producing 27.5 ± 5.0 kg/cow of milk and with 3.1 ± 1.8 lactations were evaluated (means ± standard error of the means). Cows were allocated into 4 treatments: control (CON), without plant extracts in the diet; oregano extract (OR), with the addition of 0.056% of oregano extract in the dry matter (DM) of the diet; green tea (GT), with the addition of 0.028% of green tea extract in the DM of the diet; and mixture, with the addition of 0.056% oregano extract and 0.028% green tea extract in the DM of the diet. The forage-to-concentrate ratio was 60:40. Forage was composed of corn silage (94%) and Tifton hay (6%); concentrate was based on ground corn and soybean meal. Plant extracts were supplied as powder, which was previously added and homogenized into 1 kg of concentrate in natural matter, top-dressed onto the total mixed diet. No treatment by day interaction was observed for any of the evaluated variables, but some block by treatment interactions were significant. In Holstein cows, the mixture treatment decreased gross energy and tended to decrease the total-tract apparent digestibility coefficient for crude protein and total digestible nutrients when compared with OR. During the gas measurement period, GT and OR increased the digestible fraction of the ingested DM and decreased CH (Copyright © 2018 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.) |
| Databáze: | MEDLINE |
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