The objective of this analysis was to investigate the effect of pig phenotype on growth restriction and compensatory ability after receiving a nutrient-deficient (97% corn) diet for 3 or 6 weeks. Sixteen hundred and sixty mixed-sex pigs (DNA Genetics, Columbus, NE) were tagged with radio frequency identification tags (LeeO, Prairie Systems, Spencer, IA) at birth with litter information and body weight (BW) measured at birth, weaning, and the end of the nursery phase. At a starting BW of 73.5 ± 2.2 kg, pigs were blocked by BW to 140 pens and assigned to a 2:3:1 factorial. The seven treatments were comprised of a combination of 2 restriction lengths (3 weeks vs. 6 weeks) and 3 lysine inclusion levels at re-alimentation (Lys:ME of 100%, 110%, or 120% of the genetic margin over feed curve), and a control that remained nutrient unrestricted. Individual BW was measured on trial d 0, 21, 41, and market to calculate individual average daily gain (ADG) for each phase. Percent change in ADG between each phase was calculated using the previous ADG of each pig. Observational analysis was conducted in SAS 9.4 (Cary, NC) with pig as the observational unit. When fed the restrictive diet, gilts had a greater reduction in ADG (P < 0.01) than barrows (64 vs. 59 % decrease in ADG from previous period). Furthermore, pigs with lower birth weight, thus lighter starting trial weight, had a greater decrease (P < 0.01) in growth in response to nutrient restriction. Validating the biological requirements of finishing pigs, animals with a greater lysine requirement, gilts, and lighter weight pigs had a more severe reduction in growth than those with a decreased lysine requirement.

中文翻译：

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161 性别、出生体重和营养密度对三周或六周营养限制期后育成猪生长受限和代偿性增益的影响

该分析的目的是研究猪在接受营养缺乏（97% 玉米）日粮 3 或 6 周后表型对生长受限和补偿能力的影响。1660 头混合性别的猪（DNA 遗传学，哥伦布，NE）在出生时被贴上射频识别标签（LeeO，Prairie Systems，Spencer，IA），并在出生、断奶、和育儿阶段的结束。在 73.5 ± 2.2 kg 的起始体重时，猪被 BW 阻止到 140 个猪栏，并分配到 2:3:1 的因子。七种处理包括 2 种限制长度（3 周对 6 周）和 3 种赖氨酸包含水平的组合（赖氨酸：ME 为饲料曲线上遗传裕度的 100%、110% 或 120%） )，以及保持营养不受限制的对照。在试验 d 0、21、41 和市场上测量个体 BW，以计算每个阶段的个体平均日增重 (ADG)。使用每头猪之前的 ADG 计算每个阶段之间 ADG 的百分比变化。观察分析在 SAS 9.4 (Cary, NC) 中进行，猪作为观察单位。当饲喂限制性日粮时，后备母猪的 ADG 下降幅度大于公猪（P < 0.01）（ADG 比前一时期下降 64% 与 59%）。此外，出生体重较低的猪，因此开始试验体重较轻，响应营养限制，生长下降幅度更大（P < 0.01）。验证育肥猪的生物学需求，赖氨酸需求量较高的动物、后备母猪和体重较轻的猪比赖氨酸需求量减少的猪的生长下降更为严重。