Effects on rumen microbiome and milk quality of dairy cows fed a grass silage-based diet supplemented with the macroalga Asparagopsis taxiformis

作者：S.J. Krizsan, Mohammad Ramin, Juana Catarina Cariri Chagas, Anni Halmemies‐Beauchet‐Filleau, Abhijeet Singh, Anna Schnürer, Rebecca Danielsson · 发表于：Frontiers in Animal Science · 年份：2023 · DOI：10.3389/fanim.2023.1112969 · 被引用次数：57 · 研究领域：Ruminant Nutrition and Digestive Physiology、Pasture and Agricultural Systems、Bioenergy crop production and management

The objective was to determine the effects on rumen microbiome and milk quality of reducing the methane (CH 4 ) produced from enteric fermentation by the addition of Asparagopsis taxiformis (AT) to the diets of dairy cows. Six Nordic Red cows at 122 ± 13.7 (mean ± SD) days in milk, of parity 2.7 ± 0.52 and producing 36 kg ± 2.5 kg milk per day at the start of the trial were divided into three blocks by milk yield and assigned to an extra-period Latin-square change-over design comprising two dietary treatments. An extra period of observation was added to the Latin-square change-over design to control for carry-over effects. The dietary treatments were a diet consisting of grass silage and a commercial concentrate mixture (60:40) either not supplemented or supplemented with 0.5% AT on an organic matter intake basis. On average, daily CH 4 production, CH 4 yield, and CH 4 intensity decreased by 60%, 54%, and 58%, respectively, in cows fed the diet supplemented with AT. Furthermore, hydrogen gas emitted by cows fed diets supplemented with AT increased by more than five times compared with cows fed a non-AT-supplemented diet. Feed intake was decreased and milk production altered, reflecting a decreased yield of milk fat in cows fed an AT-supplemented diet, but feed efficiency increased. Rumen fermentation parameters were changed to promote propionate rather than acetate and butyrate fermentation. The most prominent change in milk quality was an increase in bromine and iodine when ...