Alterations in ruminal bacterial populations at induction and recovery from diet-induced milk fat depression in dairy cows

Journal of Dairy Science
D W PittaK J Harvatine

Abstract

Ten ruminally cannulated Holstein cows were used in a crossover design that investigated changes in ruminal bacterial populations in response to induction and recovery from diet-induced milk fat depression (MFD). Further, the effect on the ruminal microbiota of the cows with diet-induced milk fat depression inoculated with rumen contents from non-milk fat-depressed donor cows was evaluated. Milk fat depression was induced during the first 10 d of each period by feeding a low-fiber, high-starch, and high-polyunsaturated fatty acid diet (26.1% neutral detergent fiber, 28.1% starch, 5.8% total fatty acids, and 1.9% C18:2), resulting in a 30% decrease in milk fat yield. Induction was followed by a recovery phase, where all cows were switched to a high-fiber, low-starch, and low-polyunsaturated fatty acid diet (31.8% neutral detergent fiber, 23% starch, 4.2% total fatty acids, and 1.2% C18:2) and were allocated to (1) control (no inoculation) or (2) ruminal inoculation with donor cow digesta (8 kg/d for 6 d). Ruminal samples were collected at the end of induction (d 10) and during recovery (d 13, 16, and 28), separated to solid and liquid fractions, extracted for DNA, PCR- amplified for the V1-V2 region of the 16S rRNA gene, and ana...Continue Reading

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Citations

Jan 23, 2019·Scientific Data·Hui-Zeng SunJianxin Liu
Aug 16, 2019·Current Developments in Nutrition·M Shamimul HasanShengfa F Liao
Apr 25, 2020·Animals : an Open Access Journal From MDPI·Minseok KimHyun-Jeong Lee
Jun 26, 2020·Journal of Animal Science and Biotechnology·Tansol ParkZhongtang Yu
Jun 4, 2018·Journal of Dairy Science·Dipti W PittaGraeme Attwood
Jul 25, 2019·Applied Biochemistry and Biotechnology·Laís Américo SoaresMaria Bernadete Amâncio Varesche
Feb 3, 2021·Animals : an Open Access Journal From MDPI·Henry D R AlbaGleidson G P de Carvalho
Aug 1, 2021·Tropical Animal Health and Production·Nur Atikah IbrahimSaminathan Mookiah

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