Comparison of fermentation of diets of variable composition and microbial populations in the rumen of sheep and Rusitec fermenters. II. Protozoa population and diversity of bacterial communities

Journal of Dairy Science
M E MartínezM D Carro

Abstract

Four ruminally and duodenally cannulated sheep and 8 Rusitec fermenters were used to determine the effects of dietary characteristics on microbial populations and bacterial diversity. The purpose of the study was to assess how closely fermenters can mimic the differences between diets found in vivo. The 4 experimental diets contained forage to concentrate (F:C) ratios of 70:30 (high forage; HF) or 30:70 (high concentrate; HC) with either alfalfa hay (A) or grass hay (G) as the forage. Total bacterial numbers were greater in the rumen of sheep fed HF diets compared with those fed HC diets, whereas the opposite was found in fermenters. The numbers of cellulolytic bacteria were not affected by F:C ratio in any fermentation system, but cellulolytic numbers were 2.7 and 1.8 times greater in sheep than in fermenters for HF and HC diets, respectively. Neither total bacterial nor cellulolytic numbers were affected by the type of forage in sheep or fermenters. Decreasing F:C ratio increased total protozoa and Entodiniae numbers in sheep by about 29 and 25%, respectively, but it had no effect in fermenters. Isotrichidae and Ophryoscolecinae numbers in sheep were not affected by changing F:C ratio, but both disappeared completely from fer...Continue Reading

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Citations

Jan 28, 2014·Journal of Animal Physiology and Animal Nutrition·L AbeciaE Molina-Alcaide
Jul 13, 2019·Journal of Animal Physiology and Animal Nutrition·S Leanne DillardKathy J Soder
Jun 9, 2018·Asian-Australasian Journal of Animal Sciences·Chaowarit Mapato, Metha Wanapat
Dec 19, 2019·Frontiers in Microbiology·Thomas HartingerKarl-Heinz Südekum
May 6, 2020·Animals : an Open Access Journal From MDPI·Sonia TassonePier Giorgio Peiretti
Aug 25, 2018·Journal of Microbiological Methods·Tansol Park, Zhongtang Yu
May 27, 2021·Annual Review of Microbiology·Simone RenwickEmma Allen-Vercoe

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