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Performance, carcass traits and meat quality of lambs fed with different roughage: concentrate ratios associated with variable physically effective neutral detergent fibre content

Published online by Cambridge University Press:  21 June 2021

L. de O. Queiroz
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
A. M. Barbosa*
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
G. B. Mourão
Affiliation:
University of São Paulo, Luiz de Queiroz College of Agriculture, Av. Pádua Dias, 11, Piracicaba, 13418900, São Paulo, Brazil
M. A. Fonseca
Affiliation:
Department of Agriculture, Nutrition & Veterinary Science, University of Nevada, Reno, 1664 N. Virginia St., Mail Stop 202, Sarah Fleischmann Bldg., Main Campus, 89557, Reno, USA
L. F. B. Pinto
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
J. M. da Silva Júnior
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
T. M. Silva
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
A. G. V. O. Lima
Affiliation:
Federal University of Maranhão, Agricultural and Environmental Sciences Centre, BR-222, 1600, 65500000, Chapadinha, Maranhão, Brazil
L. R. Bezerra
Affiliation:
Department of Animal Science, Federal University of Campina Grande, Avenida Universitária, s/n - Jatobá, 58708110, Patos, Paraiba, Brazil
R. L. Oliveira
Affiliation:
Department of Animal Science, Federal University of Bahia, Av. Adhemar de Barros, 500, Ondina, 40170110, Salvador, Bahia, Brazil
*
Author for correspondence: A. M. Barbosa, E-mail: [email protected]

Abstract

This study evaluated the effect of roughage:concentrate (R:C) ratio associated with a variable particle size of physically effective neutral detergent fibre (peNDF8) in the forage (Tifton-85 hay) on the performance, carcass traits and meat quality of lambs. Seventy-two 4-month-old, non-castrated Santa Ines male lambs (23.5 ± 2.32 kg BW) were distributed in a completely randomized design, in a 2 × 2 factorial arrangement [two peNDF8 hay particle sizes (13 and 6 mm) and two R:C ratios (700:300 and 500:500 g/kg DM total)]. DMI, DM, NFC and TDN digestibility's, N-intake and N-faecal excretion were affected by the R:C ratio (P < 0.05). However, the N-retained was not affected by the studied variables (P > 0.05). It was observed an interaction (P < 0.05) between the peNDF8 and R:C ratios for final BW, average daily gain (ADG), colour parameters and pH 24 h. The lower roughage ratio provided greater (P < 0.05) concentrations of C14:1, C16:1–cis9, C18:1–cis9, ΣMUFA, Σn–6n–3 and hypocholesterolemic/hypercholesterolemic index, enzymatic activity Δ9desaturase-C16 and -C18. Lambs fed a lower roughage diet had improved performance and feed efficiency, however, presented reduced polyunsaturated fatty acids (PUFA) concentrations in the meat, especially Σn–3 family. Higher roughage diet and larger peNDF8 particle size improved the concentrations of PUFA while decreased Σn–6n–3 ratio in meat. Larger peNDF8 particle size associated with higher roughage proportion, have reduced animal performance however, it increased protein concentration, a* and C* colour parameter without affecting fatty acids profile of Longissimus lumborum muscle.

Type
Animal Research Paper
Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press

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