Effects of early experience with low-quality roughage on feed intake, digestibility and metabolism in lambs.
Effects of early experience with low-quality roughage on feed intake, digestibility and metabolism in lambs.
复制标题
早期使用低品质粗饲料对羔羊采食量、消化率和代谢的影响。
DOI：
10.1111/jpn.12492
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发表时间：
2016
影响因子：
2.7
通讯作者：
Yayota M.
中科院分区：
文献类型：
--
作者：
Xu W;Taki Y;Iwasawa A;Yayota M.
本研究的目的是比较饲喂低质量粗饲料的羔羊与饲喂正常粗饲料的羔羊在生命早期的采食量、消化率和代谢。该研究包括三个时间段（P1、P2 和 P3；每个时间段 2 个月）的两种处理[低质量粗饲料组 (LR) 和对照组 (C)]。每个处理分配四只羔羊（4 个月大）。在 P1 和 P2 中，LR 饲喂苏丹草干草（CP：5.1% DM；NDF：70.4% DM），而 C 饲喂梯牧草干草（CP：8.4% DM；NDF：60.3% DM）。在 P3 中，所有羔羊均饲喂苏丹草干草。尽管 P1 中 C 的采食量显着较高 (p<0.05)，但 P2 中各组之间没有差异。 P1 和 P2 组之间的消化率、血清葡萄糖 (GLU)、尿素氮 (SUN) 和胰岛素样生长因子 1 (IGF-1) 没有差异。 P1 和 P2 期间，C 中的平均氮保留、三碘甲状腺原氨酸 (T3) 和甲状腺素 (T4) 显着较高 (p<0.05)。没有观察到治疗和经期之间存在相互作用。在 P3 中，C 的采食量较高（p<0.05），而 LR 的消化率和氮保留率往往较高。治疗之间的体重没有差异。 LR 中的 T4 和 T3 数值较低，而 LR 中的 SUN 较高 (p<0.05)。这些结果表明，在 4 个月的饲养后，早期使用低质量粗饲料的经验可能会改善羔羊的饲料消化率和氮代谢。此外，经验丰富的羔羊在利用低质量粗饲料方面变得更加高效。在 LR 中观察到的较低甲状腺激素浓度表明，经验丰富的羔羊发生了适应性变化，基础代谢率较低。
The objective of this study was to compare the feed intake, digestibility and metabolism in lambs fed low‐quality roughage with those of lambs fed normal roughage from an early stage of their life. The study consisted of two treatments [low‐quality roughage group (LR) and control group (C)] over three time periods (P1, P2 and P3; 2 months each). Four lambs (4 months old) were allocated to each treatment. In P1 and P2, LR was fed sudangrass hay (CP: 5.1% DM; NDF: 70.4% DM), whereas C was fed timothy hay (CP: 8.4% DM; NDF: 60.3% DM). In P3, all lambs were fed sudangrass hay. Although the feed intake was significantly greater (p<0.05) in C in P1, there were no differences between the groups in P2. The digestibility, serum glucose (GLU), urea nitrogen (SUN) and insulin‐like growth factor 1 (IGF‐1) did not differ between the groups in P1 and P2. The average nitrogen retention, triiodothyronine (T3) and thyroxine (T4) were significantly higher in C (p<0.05) during P1 and P2. No interaction was observed between the treatment and periods. In P3, the feed intake was greater in C (p<0.05), whereas digestibility and nitrogen retention tended to be greater in LR. The body weight did not differ between the treatments. T4 and T3 were numerically lower in LR, while the SUN was greater in LR (p<0.05). These results suggest that the early experience with low‐quality roughage may have improved feed digestibility and nitrogen metabolism in lambs after 4 months of rearing. Furthermore, the experienced lambs became more efficient at utilizing the low‐quality roughage. The lower thyroid hormone concentrations observed in LR suggest an adaptive change occurred in experienced lambs that to a lower basal metabolic rate.