The objective of this study was to evaluate the effects of secondary iron injection in suckling pigs on growth performance and hematocrit level in the suckling period. At d 1 of age, a total of 24 suckling pigs from 4 litters were allotted into 3 treatments within litter (8 pigs per treatment) based on body weight and gender as follows: 1) Control: no additional iron injection, 2) Iron100: secondary intramuscular injection of 100 mg iron-dextran, and 3) Iron200: secondary intramuscular injection of 200 mg iron-dextran. The initial 200 mg iron-dextran was injected intramuscularly on d 1 of age with a second injection given to the pigs on 11 d before weaning (d 16 of age). All piglets were weaned at d 27 of age. Body weight and hematocrit level were measured at d 0, 7, and 11 (weaning) post-injection. There was no significant difference in growth performance among the treatments. The Iron100 and Iron200 treatments had greater hematocrit levels than the Control treatment at d 7 and 11 post-injection (P < 0.05) with a greater hematocrit level in the Iron200 treatment than the Iron100 treatment at d 11 post-injection (P < 0.05; 34.25, 38.75, and 41.19% for Control, Iron100 and Iron200, respectively). For changes in hematocrit level, the Iron100 and Iron200 treatments had greater increases than the Control treatment in d 0-7 and d 0-11 post-injection (P < 0.05; -1.31, 4.31, and 5.75%) with no difference between the Iron100 and Iron200 treatments. In d 7-11 post-injection, the Iron200 treatment had a greater increase in hematocrit level than the Iron100 treatment with an intermediate value in the Control treatment (P < 0.05; 0.44, -0.06 and 1.38%). In conclusion, the secondary iron injection to suckling piglets did not affect growth performance until weaning whereas the injections increased hematocrit levels resulting in a greater value at weaning in the higher level of second iron injection.

中文翻译：

---

PSII-15 二次铁注射对哺乳期仔猪生长性能和血细胞比容水平的影响

本研究的目的是评估在乳猪中二次铁注射对哺乳期生长性能和红细胞比容水平的影响。在第 1 天时，根据体重和性别将来自 4 窝的总共 24 头乳猪分配到窝内的 3 个处理（每个处理 8 头猪），如下：1）对照：不额外注射铁，2）铁 100： 100mg铁-葡聚糖的二次肌内注射，和3) Iron200：200mg铁-葡聚糖的二次肌内注射。最初的 200 mg 铁-葡聚糖在第 1 天肌肉内注射，在断奶前 11 天（16 天）给猪第二次注射。所有仔猪在 27 岁时断奶。在注射后第 0、7 和 11 天（断奶）测量体重和血细胞比容水平。各处理间生长性能无显着差异。在注射后第 7 天和第 11 天，铁 100 和铁 200 处理的血细胞比容水平高于对照处理（P < 0.05），在注射后第 11 天，铁 200 处理的血细胞比容水平高于铁 100 处理（P < 0.05）。 0.05；对照、Iron100 和 Iron200 分别为 34.25、38.75 和 41.19%）。对于血细胞比容水平的变化，在注射后第 0-7 天和第 0-11 天，铁 100 和铁 200 处理比对照处理有更大的增加（P < 0.05；-1.31、4.31 和 5.75%），两者之间没有差异Iron100 和 Iron200 治疗。在注射后第 7-11 天，Iron200 处理比 Iron100 处理具有更大的血细胞比容水平增加，在对照处理中具有中间值（P < 0. 05; 0.44、-0.06 和 1.38%）。总之，在断奶前，给哺乳仔猪二次铁注射不会影响生长性能，而注射增加了红细胞比容水平，导致在较高水平的二次铁注射中断奶时的价值更大。