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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
The Journal of Agricultural Science ( IF 2 ) Pub Date : 2021-06-21 , DOI: 10.1017/s0021859621000459
L. de O. Queiroz , A. M. Barbosa , G. B. Mourão , M. A. Fonseca , L. F. B. Pinto , J. M. da Silva Júnior , T. M. Silva , A. G. V. O. Lima , L. R. Bezerra , R. L. Oliveira

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.

中文翻译:

饲喂不同粗饲料的羔羊的性能、胴体性状和肉质:与可变物理有效中性洗涤纤维含量相关的浓缩比

本研究评估了粗饲料:浓缩物 (R:C) 比率与草料 (Tifton-85 干草) 中物理有效的中性洗涤纤维 (peNDF8) 的可变粒径对羔羊的生产性能、胴体性状和肉质的影响. 72 只 4 个月大、未阉割的 Santa Ines 雄性羔羊 (23.5 ± 2.32 kg BW) 以完全随机设计分布,采用 2 × 2 因子排列 [两种 peNDF8 干草颗粒大小(13 和 6 毫米)和两个 R:C 比(总共 700:300 和 500:500 g/kg 干物质)]。DMI、DM、NFC 和 TDN 消化率、N 摄入量和 N 粪便排泄量受 R:C 比的影响(< 0.05)。然而,N-retained 不受研究变量的影响(> 0.05)。观察到交互作用(< 0.05) 最终体重、平均日增重 (ADG)、颜色参数和 24 小时 pH 值的 peNDF8 和 R:C 比率之间。较低的粗饲料比率提供较大的 (< 0.05) C14:1、C16:1 的浓度–顺式9、C18:1–顺式9、ΣMUFA、Σn–6n–3和低胆固醇血症/高胆固醇血症指数、酶活性Δ9去饱和酶-C16和-C18。饲喂低粗饲料日粮的羔羊提高了生产性能和饲料效率,但是,肉中的多不饱和脂肪酸 (PUFA) 浓度降低,尤其是 Σn–3家庭。较高的粗饲料日粮和较大的 peNDF8 粒径提高了 PUFA 的浓度,同时降低了 Σn–6n–3肉中的比例。较大的 peNDF8 粒径与较高的粗饲料比例相关,降低了动物的生产性能,但它增加了蛋白质浓度、a* 和 C* 颜色参数,而不影响动物的脂肪酸谱腰最长肌肌肉。
更新日期:2021-06-21
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