Tannins from Mimosa tenuiflora in the diet improves nutrient utilisation, animal performance, carcass traits and commercial cuts of lambs
Ana Carolina Caldas A , José Pereira Filho A , Daniel Menezes
A , Iara Cavalcante A , Joyce Fernandes A , Juliana Oliveira A , Ronaldo Oliveira C , Jose Fabio Moura A and Leilson Bezerra A D
+ Author Affiliations
- Author Affiliations
A Federal University of Campina Grande, Department of Animal Science, Avenuenida Universitária, s/n – Jatobá, 58708110, Patos city, Paraiba State, Brazil.
B Federal University of São Francisco Valley, Department of Veterinary Science, Rodovia BR 407, 56300000, Petrolina city, Pernambuco State, Brazil.
C Federal University of Bahia, Department of Animal Science, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador city, Bahia State, Brazil.
D Corresponding author. Email: leilson@ufpi.edu.br
Animal Production Science 61(13) 1373-1384 https://doi.org/10.1071/AN20468
Submitted: 19 August 2020 Accepted: 11 March 2021 Published: 23 April 2021
Abstract
Context: Tannins are polyphenolic compounds found in legumes, trees and forage shrubs, such as Mimosa tenuiflora, and form hydrogen bonds with proteins.
Aims: The objective of the present study was to determine the optimal dietary concentration of natural tannins from M. tenuiflora for enhancing intake, digestibility, nitrogen (N) and tannin physiological balance, performance, carcass traits and commercial cuts of lambs.
Methods: Forty-eight uncastrated Santa Ines lambs were distributed between two experiments, each with four diets containing natural tannins (1.21 (control), 9.29, 17.4 and 25.4 g/kg dry matter (DM) total) from M. tenuiflora hay.
Key results: With increasing level of inclusion of natural tannins from M. tenuiflora hay in the diet, there were quadratic increases (P ≤ 0.05; up to 17.4 g/kg DM inclusion) in the daily nutrient intake, N faecal excretion, N urinary excretion, performance, carcass traits and rib and loin commercial cut weights of lambs. However, intake, faecal excretion, physiological balance of tannins and carcass leg circumference increased (P ≤ 0.05) linearly with an increasing inclusion of tannins from M. tenuiflora hay. Furthermore, there were linear decreases (P ≤ 0.05) in the digestibility of DM, crude protein, neutral detergent fibre corrected for ash and protein, acid detergent fibre, non-fibrous carbohydrate and total digestible nutrients and decreases in faecal excretion of total phenolic compounds and feeding efficiency in lambs with increasing dietary concentration of tannins.
Conclusions: It is recommended that M. tenuiflora hay replace Brachiaria decumbens hay at 250 g/kg of dietary roughage, corresponding to 17.4 g/kg DM of tannins, in the diet of Santa Ines finishing lambs because the resulting increased bioavailability of tannins improves nutrient intake, N retention, average daily gain, carcass weight and the weights of the most profitable cuts (leg, loin and rib).
Implications: The use of M. tenuiflora legume (which is common in the Caatinga biome) as hay roughage in the lamb diet increases tannin bioavailability and the efficiency of protein use, consequently improving performance and contributing to the economic viability of sheep production in the region.
Keywords: gain, protein, sheep, tannin.
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