Evaluation of a dietary blend of essential oils and polyphenols on methane emission by ewes
A. S. Atzori
A * , M. A. Porcu A , F. Fulghesu A , A. Ledda A and F. Correddu A
A Dipartimento di Agraria, Sezione di Scienze Zootecniche, Università di Sassari, viale Italia 39, 07100 Sassari, Italy.
Animal Production Science 63(15) 1483-1493 https://doi.org/10.1071/AN23070
Submitted: 1 July 2022 Accepted: 30 July 2023 Published: 29 August 2023
Abstract
Decreasing enteric methane emissions from small ruminants is important because methane is a greenhouse gas and a major contributor to global warming.
The objective of this work was to test the effect of a dietary premix consisting of a blend of essential oils, bioflavonoids and chestnut tannins (EOP, essential oils and polyphenols) on methane emission from dry non-pregnant ewes.
Twenty-four dry Sarda ewes were allocated to two homogenous groups: control and treatment groups. Both were fed with a total mixed ration, and the treatment group was supplemented with 1 g/day.ewe of EOP blend. Each animal followed a 20-day adaptation period before methane emission measurements. Methane emissions were measured using a ventilated hood system equipped with a digital gas analyser.
The addition of a dietary EOP blend to the total mixed ration did not affect feed intake and nutrient digestibility. Ewes that received the EOP blend had a 13% lower methane yield than ewes that received the control diet (22.4 vs 25.5 g of CH4 per kg of dry matter intake; P < 0.05, respectively). The EOP blend had no impact on daily methane emission when calculated as g CH4/ewe or g CH4/kg bodyweight.
The EOP blend at a daily dose of 1 g/day.ewe decreased methane yield under the experimental conditions described in this work.
Feeding an EOP dietary blend to ewes can decrease methane emission. These results were obtained in vivo with typical farm conditions, suggesting that a similar response may occur in field conditions.
Keywords: digestibility, enteric emissions, essential oils, feed intake, methane, sheep, tannins, ventilated hood.
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