Impact of a tannin extract on animal performance and nitrogen excretion of dairy cows grazing a tropical pasture
T. Orlandi A , C. A. Pozo A , J. Schiavo B , L. Oliveira B and G. V. Kozloski A CA Departamento de Zootecnia, Universidade Federal de Santa Maria, Santa Maria, RS, 97105-900, Brazil.
B Departamento de Ciências Agrárias, Universidade do Noroeste do Estado do Rio Grande do Sul, Ijuí, RS, 98700-000, Brazil.
C Corresponding author. Email: gilberto.kozloski@ufsm.br
Animal Production Science 60(9) 1183-1188 https://doi.org/10.1071/AN18726
Submitted: 23 November 2018 Accepted: 2 December 2019 Published: 3 March 2020
Abstract
Context: Tannin extracts have been investigated as natural feed additives with the potential to decrease the enteric emission of methane and urinary N and to improve the productive performance of ruminants. However, the impact of this additive in dairy cattle grazing tropical grass pastures has not been extensively evaluated.
Aims: To evaluate the impact of the Acacia mearnsii bark extract (TA) on productive and nutritional variables in dairy cows grazing a Cynodon dactylon pasture and receiving supplementary corn silage and concentrate.
Methods: Fourteen multiparous Holstein dairy cows were assigned in a randomised block design to either of the following two treatments: concentrate without TA (control) or with 10 g of TA/kg dry matter (DM). The concentrate and corn silage accounted for ~0.30 and 0.30 of total DM intake respectively.
Key results: The dietary concentration of TA was 2.9 g/kg DM and it did not affect nutrients intake, milk production and composition, rumen microbial protein synthesis, plasma urea concentration or faecal N excretion. Total N and urea N excreted in urine were higher, whereas total N excreted in manure tended to be higher in TA treatment.
Conclusions: No productive advantage was obtained by including TA in the diet of dairy cows grazing Cynodon dactylon pasture. Instead, it increased the excretion of labile urinary N.
Implications: The effect of the use of TA as a feed additive for cows fed tropical grass-based diets is negative from the environmental point of view.
Additional keywords: Acacia mearnsii, Cynodon dactylon, excretions, milk yield, nitrogen utilisation.
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