Effects of forage family on apparent ruminal synthesis of B vitamins in lactating dairy cows

Journal of Dairy Science
D S CastagninoC L Girard

Abstract

Effects of forage family (legume vs. grass) on apparent ruminal synthesis (ARS) and postruminal supply of B vitamins were evaluated in 2 experiments. Diets containing either alfalfa (AL) or orchardgrass (OG) silages as the sole forage were offered to ruminally and duodenally cannulated lactating Holstein cows in crossover design experiments. Experiment 1 compared diets containing AL and OG [~23% forage neutral detergent fiber (NDF) and ~27% total NDF] offered to 8 cows in two 15-d treatment periods. Experiment 2 compared diets containing AL and OG (~25% forage NDF and ~30% total NDF) offered to 13 cows in two 18-d treatment periods. Thiamin, riboflavin, niacin, vitamin B6, folates, and vitamin B12 were analyzed in feeds and duodenal digesta. Apparent ruminal synthesis was calculated as the duodenal flow of each vitamin minus its intake. Forage family affected B vitamin intakes, duodenal flow, and ARS. In both experiments, AL diets increased vitamin B6 and decreased folate intakes. In experiment 1, riboflavin and niacin intakes were greater with the OG diet, whereas in experiment 2 thiamin intake was greater but riboflavin intake was smaller with the OG diet. In spite of the low contribution of either silage to the dietary folat...Continue Reading

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Citations

Aug 31, 2016·Animal : an International Journal of Animal Bioscience·D S CastagninoC L Girard
Jul 11, 2018·The British Journal of Nutrition·Xiaohua PanBenhai Xiong
Sep 3, 2019·The British Journal of Nutrition·Juncai ChenGuozhong Dong
Mar 5, 2020·MSystems·Julian Franco-LopezJennifer Ronholm
Feb 19, 2019·Animal : an International Journal of Animal Bioscience·M DuplessisC L Girard
May 10, 2020·Animals : an Open Access Journal From MDPI·Julien SoulatIsabelle Dufrasne
Jun 3, 2020·Methods : a Companion to Methods in Enzymology·C L Girard, B Graulet
Mar 7, 2021·Animals : an Open Access Journal From MDPI·Mélissa DuplessisJennifer Ronholm

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