Effects of supplemental methionine sources in finishing pig diets on growth performance, carcass characteristics, cutting yields, and meat quality.

IF 1.3 Q3 AGRICULTURE, DAIRY & ANIMAL SCIENCE Translational Animal Science Pub Date : 2024-05-27 eCollection Date: 2024-01-01 DOI:10.1093/tas/txae088

Hannah M Remole, John K Htoo, S M Mendoza, Casey L Bradley, Ryan N Dilger, Anna C Dilger, Bailey N Harsh

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Abstract

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 (N = 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 (P = 0.34) between treatments (LM 104.5 kg; DLM 103.0 kg; MHA 101.5 kg), moreover, loin eye area was not different (P = 0.98) between treatments (LM 52.65 cm²; DLM 52.49 cm²; MHA 52.81 cm²). Boneless carcass-cutting yield was not different (P = 0.56) between treatments (LM 54.97 kg; DLM 54.82 kg; MHA 54.52 kg). Loin pH was not different (P = 0.24) between treatments (LM 5.45; DLM 5.48; MHA 5.45). However, drip loss tended to be reduced (P = 0.11) by the DLM treatment (5.58%) compared with LM (7.03%) and MHA (6.68%) treatments. Shear force was not different (P = 0.85) between treatments (LM 3.03 kg; DLM 3.06 kg; MHA 3.10 kg). However, cook loss tended to be reduced (P = 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.

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育成猪日粮中补充蛋氨酸来源对生长性能、胴体特征、切割产量和肉质的影响。

补充蛋氨酸（Met）在养猪业中被广泛使用；然而，有关蛋氨酸来源对胴体可切割性和肉质影响的数据却很有限。本研究旨在确定育成猪日粮中 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%）对胴体特征和肉质的影响。9周龄的猪（N = 240）被分配到 60 个单性猪栏中，进行为期 104 天的四阶段育成猪试验。猪在第 56 天之前饲喂普通生长猪日粮，第 56 天后，猪栏中的猪被随机分配到三种试验日粮中的一种。在育成期剩余的 7 周内，猪只（体重 = 79.9 ± 0.80 kg）饲喂含有 LM、DLM 或 MHA 的日粮，补充的 Met 来源为标准回肠可消化 (SID) Met + 半胱氨酸 (Cys) 需求量的 25%，根据 MHA 与 LM 或 DLM 相比 65% 的生物效价计算。在研究结束时（第 104 天），每栏屠宰一头猪，并将胴体左侧切成次初级切块，以确定胴体切割产量。对包括近似成分和剪切力在内的里脊肉质量进行了测量。不同处理之间的热胴体重量没有差异（P = 0.34）（LM 104.5 千克；DLM 103.0 千克；MHA 101.5 千克），此外，不同处理之间的腰眼面积也没有差异（P = 0.98）（LM 52.65 平方厘米；DLM 52.49 平方厘米；MHA 52.81 平方厘米）。不同处理的去骨胴体切割产量无差异（P = 0.56）（LM 54.97 千克；DLM 54.82 千克；MHA 54.52 千克）。不同处理之间的里脊肉 pH 值没有差异（P = 0.24）（LM 5.45；DLM 5.48；MHA 5.45）。然而，与 LM（7.03%）和 MHA（6.68%）相比，DLM 处理（5.58%）的滴水损失有减少的趋势（P = 0.11）。不同处理（LM 3.03 千克；DLM 3.06 千克；MHA 3.10 千克）的剪切力没有差异（P = 0.85）。然而，与 LM（18.18%）和 MHA（18.50%）处理相比，DLM 处理（16.20%）有减少熟化损失的趋势（P = 0.06）。这些数据表明，当 MHA 的生物效价为 65% 时，相对于 L-Met 或 DL-Met，育成猪日粮中 Met 来源对胴体可切割性和肉质的影响微乎其微。

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来源期刊

Translational Animal Science Veterinary-Veterinary (all)

CiteScore

2.80

自引率

15.40%

发文量

149

审稿时长

8 weeks

期刊介绍： Translational Animal Science (TAS) is the first open access-open review animal science journal, encompassing a broad scope of research topics in animal science. TAS focuses on translating basic science to innovation, and validation of these innovations by various segments of the allied animal industry. Readers of TAS will typically represent education, industry, and government, including research, teaching, administration, extension, management, quality assurance, product development, and technical services. Those interested in TAS typically include animal breeders, economists, embryologists, engineers, food scientists, geneticists, microbiologists, nutritionists, veterinarians, physiologists, processors, public health professionals, and others with an interest in animal production and applied aspects of animal sciences.