Remus Aline, Hauschild Luciano, Corrent Etienne, Létourneau-Montminy Marie-Pierre, Pomar Candido
Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, Sherbrooke, Quebec, J1M 0C8 Canada.
2Département des sciences animales, Université Laval, Quebec City, Quebec, G1V 0A6 Canada.
J Anim Sci Biotechnol. 2019 Feb 22;10:16. doi: 10.1186/s40104-019-0328-7. eCollection 2019.
There is large variation in amino acids requirements among pigs, hence feeding pigs individually with daily tailored diets or in groups with a single feed may require different levels of nutrients. Thus, the response to different threonine levels (70%, 85%, 100%, 115%, and 130% of the ideal threonine:lysine protein ratio of 0.65) was studied in growing pigs raised in a conventional group phase-feeding (GPF) system or fed individually using individual precision-feeding (IPF) techniques. In a 21-day trial, 110 barrows (25 ± 0.80 kg body weight) were housed in the same room and fed using electronic feeders. Five pigs per treatment were slaughtered at the end of the trial.
Threonine intake increased linearly for the IPF and GPF pigs ( < 0.05). Lysine intake was similar across the treatments. Average daily gain, gain:feed ratio, and protein deposition were affected linearly by threonine level ( < 0.05) in both feeding systems. Protein deposition in the GPF pigs was maximized at 150 g/d and a 0.65 threonine:lysine ratio, whereas protein deposition increased linearly in the IPF pigs. Plasma Met and serine levels were 11 and 7% higher, respectively, in the IPF pigs than in the GPF pigs ( < 0.05). Dietary threonine increased ( < 0.05) threonine concentration in the longissimus dorsi in a quadratic manner in the IPF pigs, whereas there was no effect in the GPF pigs. Longissimus dorsi collagen decreased as dietary threonine increased in the IPF and GPF pigs ( < 0.10). Carcass muscle crude protein was 2% higher in the GPF pigs than in the IPF pigs ( < 0.05).
Individual pigs are able to modulate growth and the composition of growth according to threonine intake. The average amino acid ratio value that is currently used for GPF cannot be used for IPF.
猪对氨基酸的需求量差异很大，因此单独给猪投喂每日定制日粮或给猪群投喂单一饲料可能需要不同水平的营养素。因此，研究了在传统群体分阶段饲养（GPF）系统中饲养的生长猪或使用个体精准饲养（IPF）技术单独饲养的生长猪对不同苏氨酸水平（理想苏氨酸：赖氨酸蛋白质比0.65的70%、85%、100%、115%和130%）的反应。在一项为期21天的试验中，110头公猪（体重25±0.80千克）被安置在同一房间，并使用电子饲喂器进行饲喂。试验结束时，每个处理组宰杀5头猪。
IPF猪和GPF猪的苏氨酸摄入量呈线性增加（P<0.05）。各处理组的赖氨酸摄入量相似。两个饲养系统中，平均日增重、增重：饲料比和蛋白质沉积均受苏氨酸水平的线性影响（P<0.05）。GPF猪的蛋白质沉积在150克/天和苏氨酸：赖氨酸比为0.65时达到最大值，而IPF猪的蛋白质沉积呈线性增加。IPF猪的血浆蛋氨酸和丝氨酸水平分别比GPF猪高11%和7%（P<0.05）。日粮苏氨酸使IPF猪背最长肌中的苏氨酸浓度呈二次方增加（P<0.05），而对GPF猪没有影响。在IPF猪和GPF猪中，随着日粮苏氨酸的增加，背最长肌胶原蛋白减少（P<0.10）。GPF猪胴体肌肉粗蛋白比IPF猪高2%（P<0.05）。
个体猪能够根据苏氨酸摄入量调节生长和生长组成。目前用于GPF的平均氨基酸比值不能用于IPF。
