Feeding sunflower oil enriched with bromoform from Asparagopsis taxiformis impacts young bulls' growth, health, enteric methane production and carbon footprint.

作者：F. Sena, D. Henriques, M. Dentinho, K. Paulos, A. Francisco, A. Portugal, A. Oliveira, H. Ramos, R. Bexiga, S. Moradi, J.J. Correia, D.M. Soares, N. Rodrigues, R. Teixeira, S. Alves, T. Domingos, R. Bessa, J. Santos-Silva · 发表于：Animal · 年份：2025 · DOI：10.1016/j.animal.2025.101681 · 被引用次数：2 · 研究领域：Medicine

Concerns regarding greenhouse gas emissions from the ruminant livestock sector led to research into different anti-methanogenic strategies. One of these strategies involves supplementing ruminant diets with Asparagopsis taxiformis, which produces anti-methanogenic halogenated compounds. The present study focused on the impact of supplementing A. taxiformis macerate with sunflower oil (Bromoil) on enteric methane emissions, whole-system carbon footprint, animal performance, and health. Sixteen Angus-cross young bulls fed a total mixed ration (TMR) diet, comprising haylage and concentrate (50:50 in DM) and 20 g of oil/kg of DM, were randomly assigned to one of three treatments varying in dietary bromoform (CHBr3) concentration: B0 (0 mg/kg DM), B20 (20 mg/kg DM) and B30 (30 mg/kg DM). After a 17-day adaptation period to the diets and experimental conditions, the animals were fed ad libitum for 77 days. Methane emissions were measured using a GreenFeed unit. The animals were weighed every 14 days prior to feed distribution. Treatments were suspended 72 h before slaughter. Physical and chemical traits were evaluated in meat. The half-life of CHBr3 in air-exposed diets was 3.18 h, and at 24 h, about 87% of the CHBr3 had disappeared from the samples. Dry matter intake and feed conversion ratio were not affected by the treatments; however, average daily gain was reduced by 10% in B30 when compared to B0. Methane production per kg of BW gain was reduced by 33% in B20 and by 48% in B3...