Effects ofLive Cells onOat Straw Rumen Fermentation

Asian-Australasian Journal of Animal Sciences

Michael E. Hume¹  Jaime Salinas²  Manuel Murillo³  Mateo Itza⁴  Yamicela Castillo⁴  Agustín Corral⁵  Claudio Arzola⁵  Eduviges Burrola⁵ 

[1] Agricultural Research Service, Southern Plains Research Center, Food and Feed Safety Research Unit, United States Department of Agriculture, College Station, TX 77843, .USA;College of Veterinary Medicine and Animal Science, Autonomous University of Tamaulipas, Cd. Victoria, Tamps. 87000, .México;College of Veterinary Medicine and Animal Science, Juarez University of Durango State, Durango, Dgo. 34000, .Mexico;Department of Veterinary Medicine, Multidisciplinary Division, Autonomous University of Juarez City, Nuevo Casas Grandes, Chih. 31803, .México;;

关键词: Rumen;    Fermentation;    Yeast;    Oat Straw;    Methane;   

DOI  :  10.5713/ajas.15.0166

来源: DOAJ

【 摘 要 】

This study evaluated the effect of Candida norvegensis (C. norvegensis) viable yeast culture on in vitro ruminal fermentation of oat straw. Ruminal fluid was mixed with buffer solution (1:2) and anaerobically incubated with or without yeast at 39°C for 0, 4, 8, 16, and 24 h. A fully randomized design was used. There was a decrease in lactic acid (quadratic, p = 0.01), pH, (quadratic, p = 0.02), and yeasts counts (linear, p<0.01) across fermentation times. However, in vitro dry matter disappearance (IVDMD) and ammonia-N increased across fermentation times (quadratic; p<0.01 and p<0.02, respectively). Addition of yeast cells caused a decrease in pH values compared over all fermentation times (p<0.01), and lactic acid decreased at 12 h (p = 0.05). Meanwhile, yeast counts increased (p = 0.01) at 12 h. C. norvegensis increased ammonia-N at 4, 8, 12, and 24 h (p<0.01), and IVDMD of oat straw increased at 8, 12, and 24 h (p<0.01) of fermentation. Yeast cells increased acetate (p<0.01), propionate (p<0.03), and butyrate (p<0.03) at 8 h, while valeriate and isovaleriate increased at 8, 12, and 24 h (p<0.01). The yeast did not affect cellulolytic bacteria (p = 0.05), but cellulolytic fungi increased at 4 and 8 h (p<0.01), whereas production of methane decreased (p<0.01) at 8 h. It is concluded that addition of C. norvegensis to in vitro oat straw fermentation increased ruminal fermentation parameters as well as microbial growth with reduction of methane production. Additionally, yeast inoculum also improved IVDMD.

【 授权许可】

Unknown