Remole Hannah M, Htoo John K, Mendoza S M, Bradley Casey L, Dilger Ryan N, Dilger Anna C, Harsh Bailey N
Department of Animal Sciences, University of Illinois, Urbana, IL, USA.
Evonik Operations GmbH, Hanau-Wolfgang, Germany.
Transl Anim Sci. 2024 May 27;8:txae088. doi: 10.1093/tas/txae088. eCollection 2024.
Supplemental methionine (Met) is widely used within the swine industry; however, data are limited regarding the effect of Met sources on carcass cutability and meat quality. The objective was to determine the effects of L-Met (LM, 99%), DL-Met (DLM, 99%), or calcium salt of DL-Met hydroxyl analog (MHA, 84%) in finishing pig diets on carcass characteristics and meat quality. At 9 weeks of age, pigs ( = 240) were allocated to 60 single-sex pens for a four-phase finishing trial that lasted 104 d. Pigs were fed a common grower diet until day 56 where pens were randomly allotted to one of the three experimental diets. For the remaining 7 wk of the finisher phase, pigs (BW = 79.9 ± 0.80 kg) were fed diets containing LM, DLM, or MHA, with the supplemental Met source providing 25% of standardized ileal digestible (SID) Met + cysteine (Cys) requirement based on 65% bioefficacy for MHA in comparison with LM or DLM. One pig per pen was slaughtered at the study conclusion (on day 104), and the left sides of carcasses were fabricated into subprimal cuts to determine carcass-cutting yields. Loin quality including proximate composition and shear force were measured. Hot carcass weight was not different (= 0.34) between treatments (LM 104.5 kg; DLM 103.0 kg; MHA 101.5 kg), moreover, loin eye area was not different (= 0.98) between treatments (LM 52.65 cm²; DLM 52.49 cm²; MHA 52.81 cm²). Boneless carcass-cutting yield was not different (= 0.56) between treatments (LM 54.97 kg; DLM 54.82 kg; MHA 54.52 kg). Loin pH was not different (= 0.24) between treatments (LM 5.45; DLM 5.48; MHA 5.45). However, drip loss tended to be reduced (= 0.11) by the DLM treatment (5.58%) compared with LM (7.03%) and MHA (6.68%) treatments. Shear force was not different (= 0.85) between treatments (LM 3.03 kg; DLM 3.06 kg; MHA 3.10 kg). However, cook loss tended to be reduced (= 0.06) by the DLM treatment (16.20%) compared with LM (18.18%) and MHA (18.50%) treatments. These data suggest that only minimal differences in carcass cutability and meat quality can be attributed to Met source in finishing pig diets when using 65% bioefficacy for MHA relative to L-Met or DL-Met.
在养猪行业中，蛋氨酸（Met）被广泛应用；然而，关于蛋氨酸来源对胴体可切割性和肉质影响的数据却很有限。本研究的目的是确定在育肥猪日粮中添加L-蛋氨酸（LM，99%）、DL-蛋氨酸（DLM，99%）或DL-蛋氨酸羟基类似物钙盐（MHA，84%）对胴体特性和肉质的影响。9周龄时，将240头猪分配到60个单性别猪栏中，进行为期104天的四阶段育肥试验。在第56天之前，给猪饲喂普通生长育肥猪日粮，之后将猪栏随机分配到三种试验日粮中的一种。在育肥阶段的剩余7周内，给体重为79.9±0.80千克的猪饲喂含有LM、DLM或MHA的日粮，与LM或DLM相比，添加的蛋氨酸来源提供基于MHA 65%生物学效价的25%的标准回肠可消化（SID）蛋氨酸+半胱氨酸（Cys）需求量。在试验结束时（第104天），每个猪栏屠宰一头猪，将胴体左侧制成主要切块以确定胴体切割产量。测定了猪里脊肉的品质，包括近似成分和剪切力。各处理间热胴体重差异不显著（P = 0.34）（LM为104.5千克；DLM为103.0千克；MHA为101.5千克），此外，各处理间猪里脊肉面积差异不显著（P = 0.98）（LM为52.65平方厘米；DLM为52.49平方厘米；MHA为52.81平方厘米）。各处理间去骨胴体切割产量差异不显著（P = 0.56）（LM为54.97千克；DLM为54.82千克；MHA为54.52千克）。各处理间猪里脊肉pH值差异不显著（P = 0.24）（LM为5.45；DLM为5.48；MHA为5.45）。然而，与LM（7.03%）和MHA（6.68%）处理相比，DLM处理（5.58%）的滴水损失有降低趋势（P = 0.11）。各处理间剪切力差异不显著（P = 0.85）（LM为3.03千克；DLM为3.06千克；MHA为3.10千克）。然而，与LM（18.18%）和MHA（18.50%）处理相比，DLM处理（16.20%）的熟肉损失有降低趋势（P = 0.06）。这些数据表明，当相对于L-蛋氨酸或DL-蛋氨酸使用MHA 65%的生物学效价时，育肥猪日粮中蛋氨酸来源对胴体可切割性和肉质的影响差异极小。
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