Supplementary data to publication "Feeding dairy cows bakery by-products enhanced nutrient digestibility, but impacted fecal microbial composition and pH in a dose-dependent manner"

Kaltenegger, A.

doi:10.17632/bm2jpcsr7s.1

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“…Cows received a TMR during the entire experiment, consisting of 50% pelleted concentrate mixture (30% grains or BP and 20% protein-mineral supplement), 25% corn silage, and 25% grass silage (on DM basis). The detailed ingredients and chemical composition of the diets are shown in Kaltenegger et al (2020) and listed in the Supplemental Table S1 (https: / / dx .doi .org/ 10 .17632/ bm2jpcsr7s .1; Kaltenegger, 2021). The BP used were collected from Viennese bakeries and supermarkets by a local feed company (Königshofer GmbH) that dried, milled, and pelleted the concentrate feed together with the other ingredients.…”

Section: Animals Diets and Experimental Designmentioning

confidence: 99%

“…Furthermore, the relative abundance of uncultured Peptococcaceae (r = 0.56) and Parasutterella (r = 0.80) was positively correlated with the proportion of the VFA valerate as well as negatively correlated with the proportion of acetate in feces (Peptococcaceae: r = −0.40 and Parasutterella: r = −0.60). The results of the regression analysis are shown in Supplemental FigureS1(https: / / dx .doi .org/ 10 .17632/ bm2jpcsr7s .1,Kaltenegger, 2021), indicating a negative effect of sugar and EE intake on the relative abundance of the genus Fibrobacter.…”

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Feeding dairy cows bakery by-products enhanced nutrient digestibility, but affected fecal microbial composition and pH in a dose-dependent manner

Kaltenegger

Humer

Pacífico

et al. 2021

Journal of Dairy Science

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We reported recently that adding bakery by-products (BP) to the diets of dairy cows up to 30% improved performance and rumen pH, but caused major shifts in the nutrient profile and availability, likely modifying nutrient degradation patterns throughout the gastrointestinal tract. The aim of this study was to investigate the effects of the gradual replacement of cereals by BP on the apparent total-tract digestibility (ATTD), the fermentation patterns, and the microbial community in feces of dairy cows. Twenty-four mid-lactating Simmental cows (149 ± 22.3 days in milk, 756 ± 89.6 kg of initial body weight) were fed a total mixed ration ad libitum (fresh feed was offered twice per day) containing a 50:50 ratio of forage to concentrate (dry matter basis) throughout the experiment. The trial lasted 5 wk, whereby the first week was used for baseline measurements, in which all cows received the same diet, without BP. Cows were then randomly allocated into 3 groups differing in the BP content of diets (0% BP, 15% BP, and 30% BP on a DM basis) and fed for 4 wk. Fecal samples were taken for analysis of pH, volatile fatty acids (VFA), and 16S rRNA gene sequencing. The inclusion of BP resulted in an increase of ether extract and sugars, and a reduction of starch and neutral detergent fiber in the diet. Feeding BP linearly increased the ATTD of almost all nutrients resulting in up to 2 kg more digestible organic matter intake (DOMI). Increasing BP level up to 30% increased fecal total VFA concentration and decreased the pH. The proportion of butyrate in feces increased linearly, but the proportion of all other VFA was not affected by BP-feeding. The richness and diversity indices of the fecal microbiota linearly declined by the inclusion of BP. The cellulolytic phyla Fibrobacteres decreased, whereas amylolytic phyla, such as Proteobacteria, increased. Overall, re-sults showed that feeding BP linearly increased ATTD and DOMI, but impaired fecal microbial diversity and pH. In the interest of the optimization of BP inclusion in the dairy cows' feeding, a dietary level between 15 to 30% of BP might be a better compromise than 30% in terms of an enhanced DOMI and performance with still lowered risk of hindgut dysbiosis, but this will require further investigations.

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Section: Animals Diets and Experimental Designmentioning

confidence: 99%

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confidence: 99%