Effects of dietary crude protein and tannic acid on rumen fermentation, rumen microbiota and nutrient digestion in beef cattle

Effect of Dietary Crude Protein on Productive Efficiency, Nutrient Digestibility, Blood Metabolites and Gastrointestinal Immune Markers in Light Lambs

“…Despite no overall differences being detected, during the finishing phase there was a tendency for greater FCR in the CP20/19 group than in the CP18/17 group. This may be related to a disruption in nitrogen-energy balance in the rumen that could have impaired microbial protein synthesis [27], and consequently, the greater dietary CP in the CP20/19 group was not counterbalanced with an increased growth performance. The last INRA [7] feeding system for ruminants estimates that growing-finishing lambs from 15 to 25 of BW, with 250 g of ADG, requires between 110 and 103 g metabolizable protein PDI (protein digestible in the small intestine)/kg DM intake.…”

“…This calculation suggests that lambs fed CP18/17 CP were more efficient in dietary CP use. The reduction of dietary CP seems a feasible strategy to mitigate the nitrogen gas emissions, as both NH 3 (an environmental acidifier) and N 2 O (a potent warming gas aroused from the NH 4 nitrification-denitrification process) may be reduced [27].…”

A commentary on methodological aspects of hydrolysable tannins metabolism in ruminant: a perspective view

“…Also, in another study, the authors reported the inhibitory effects of TA equal to 16Á9 g kg À1 dry matter (DM) on rumen fermentation and dietary crude protein digestibility (Zhou et al 2019). This could be due to TA metabolites (including pyrogallol, gallic acid (GA) and resorcinol) and the protein-binding effect (Zhou et al 2019). The concentration of TA degradation products (lg ml À1 ) for pyrogallol, GA and resorcinol in rumen fluid were 36Á75, 1Á61 and 0Á35 (lg ml À1 ) respectively (Zhou et al 2019).…”

“…Animal nutritionists, biochemists and microbiologists have focused on the application of dietary feed additives such as plant secondary metabolites in order to modify or manipulate microbial activities of digestive tract of animals (Hassanat and Benchaar 2013;Aguerre et al 2016;Yang et al 2017;Aboagye et al 2018;Costa et al 2018;Salami et al 2018;Focant et al 2019;Wei et al 2019;Zhang et al 2019;Zhou et al 2019). The aim of this manipulation is to enhance feed utilization, reduce greenhouse gas productions and reduce energy loss from animal productions.…”

“…However, feeding ruminants on diets containing plant secondary metabolites, especially tannins, can have both positive and negative impact on the ruminal fermentation and nutrient digestibility, animal performance and animal detoxification systems (Zhu et al 1992;Reed 1995;Frutos et al 2004a;Doce et al 2009;Cipriano-Salazar et al 2018;Zhou et al 2019). For example, Cipriano-Salazar et al (2018) shows that only 20% of the ruminal bacterial isolates have the capacity to tolerate 0Á63 and 1Á25 mg of tannic acid (TA) per litre.…”