In:
The Journal of Agricultural Science, Cambridge University Press (CUP), Vol. 159, No. 3-4 ( 2021-04), p. 293-303
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– cis 9, C18:1– cis 9, ΣMUFA, Σ n–6 :Σ n–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 Σ n–3 family. Higher roughage diet and larger peNDF8 particle size improved the concentrations of PUFA while decreased Σ n–6 :Σ n–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 of Medium:
Online Resource
ISSN:
0021-8596
,
1469-5146
DOI:
10.1017/S0021859621000459
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
2021
detail.hit.zdb_id:
1498349-7
