Lyu Zhiqian, Zang Jianjun, Lai Changhua, Li Ping, Ma Dongli, Zhao Jinbiao, Zhang Shuai, Huang Chengfei
State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China.
Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou, China.
J Anim Physiol Anim Nutr (Berl). 2019 Nov;103(6):1895-1907. doi: 10.1111/jpn.13197. Epub 2019 Sep 5.
The objectives of this study were (a) to investigate the effect of body weight (BW) on available energy in fibre-rich diets containing two NDF levels; and (b) to evaluate the effect of fibre type and NDF level on AA digestibility. In Exp. 1, barrows (24 at 33.4 ± 1.1 kg; 24 at 86.8 ± 3.3 kg) were randomly allotted to 4 diets containing a high protein basal (HPB), a low protein basal (LPB), 70% HPB + 30% wheat bran (WB) (HPB-WB) and 70% LPB + 30% sunflower meal (SFM) (LPB-SFM). In Exp. 2, barrows (24 at 33.5 ± 1.8 kg; 24 at 87.0 ± 3.8 kg) were randomly allotted to 4 diets containing no SFM with 12% NDF (SFM0LF), no SFM with 16% NDF (SFM0HF), 24% SFM with 12% NDF (SFM24LF) and 24% SFM with 16% NDF (SFM24HF). In Exp. 3, twelve barrows (35.5 ± 3.4 kg) fitted with T-cannulas were allotted to two 6 × 4 Youden square design with 6 diets (4 same diets as in Exp. 2 and 2 nitrogen-free diets). The concentration of DE, ME and ATTD of GE, CP, NDF and ADF in diets was greater (p < .01) when fed to 90 kg pigs compared with 30 kg pigs. The ME in ingredients was not affected by BW. The ATTD of NDF was negatively correlated with the CF (r = -.98; p < .01), ADF (r = -.99; p < .01) and ADL content (r = -.96; p < .01). The ME of diets was negatively correlated with the ATTD of CF (r = -.98; p < .01). The addition of SFM increased the standardized ileal digestibility (SID) of Met (p < .05). In conclusion, diets rich in fibre had different nutritional values at different pig weight stages. The AA digestibility depends mainly on chemical composition of diets.
(a) 研究体重（BW）对含有两种中性洗涤纤维（NDF）水平的高纤维日粮中可利用能量的影响；(b) 评估纤维类型和NDF水平对氨基酸消化率的影响。在试验1中，将仔猪（24头，体重33.4±1.1千克；24头，体重86.8±3.3千克）随机分配到4种日粮中，分别为高蛋白基础日粮（HPB）、低蛋白基础日粮（LPB）、70%HPB + 30%麦麸（WB）（HPB-WB）和70%LPB + 30%向日葵粕（SFM）（LPB-SFM）。在试验2中，将仔猪（24头，体重33.5±1.8千克；24头，体重87.0±3.8千克）随机分配到4种日粮中，分别为不含SFM且NDF含量为12%的日粮（SFM0LF）、不含SFM且NDF含量为16%的日粮（SFM0HF）、含24%SFM且NDF含量为12%的日粮（SFM24LF）和含24%SFM且NDF含量为16%的日粮（SFM24HF）。在试验3中，将12头安装了T型套管的仔猪（体重35.5±3.4千克）按照6×4尤登方设计分配到两种日粮中，共有6种日粮（4种与试验2中的相同日粮和2种无氮日粮）。与30千克的猪相比，日粮中消化能（DE）、代谢能（ME）以及总能（GE）、粗蛋白（CP）、NDF和酸性洗涤纤维（ADF）的表观全肠道消化率（ATTD）在饲喂90千克猪时更高（p<0.01）。日粮中各成分的ME不受体重影响。NDF的ATTD与粗纤维（CF）（r=-0.98；p<0.01）、ADF（r=-0.99；p<0.01）和酸性洗涤木质素（ADL）含量（r=-0.96；p<0.01）呈负相关。日粮的ME与CF的ATTD呈负相关（r=-0.98；p<0.01）。添加SFM提高了蛋氨酸的标准回肠消化率（SID）（p<0.05）。总之，富含纤维的日粮在不同体重阶段的猪具有不同的营养价值。氨基酸消化率主要取决于日粮的化学成分。
