کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2421082 1552491 2007 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Varying endophyte status and energy supplementation of fresh tall fescue in continuous culture
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Varying endophyte status and energy supplementation of fresh tall fescue in continuous culture
چکیده انگلیسی
Eight dual-flow continuous culture vessels (700 ml) were used to compare in vitro effects of toxic, endophyte-infected (E+), endophyte-free (E−), and non-toxic, endophyte-infected (EN) Jesup tall fescue (vegetative stage) on ruminal fermentation at 4 levels (0, 150, 300, and 450 g kg−1 DM) of concentrate supplementation (ground corn) for a total of 12 experimental diets in a randomized incomplete block design with 2 replicates. Each culture vessel was offered a total of 15 g DM d−1. Forage was fed in four equal portions (fed at 03:00, 09:00, 15:00, and 21:00 h); and corn was fed in two equal portions (fed at 09:00 and 21:00 h). Headspace gas and liquid samples were analyzed for methane, ruminal culture pH, ammonia-N, and volatile fatty acid production. Ammonia-N output (g d−1) varied by grass; EN had lower values compared to those of E+ and E−. Increasing the level of grain linearly decreased ruminal culture pH, ammonia-N, acetate production, and the acetate-to-propionate ratio, whereas propionate and butyrate production increased with higher grain supplementation. Ruminal fermentation was minimally altered by the presence of the endophyte; however, for the highest level of grain fed (450 g kg−1 DM fed) the methane production pattern for all three grasses was altered. In addition to having the lowest ruminal ammonia-N accumulation, the non-toxic, endophyte-infected fescue resulted in the lowest methane production measured.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Animal Feed Science and Technology - Volume 132, Issues 1–2, 1 January 2007, Pages 123-136
نویسندگان
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