Noy Y, Sklan D
Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Poult Sci. 2001 Oct;80(10):1490-5. doi: 10.1093/ps/80.10.1490.
This study examined in posthatch chicks the partition of yolk utilization between transport to the circulation and secretion to the intestine and determined absorption and plasma concentrations of some metabolites. The presence of feed in the gastrointestinal tract enhanced yolk secretion to the small intestines. Absorption of glucose, methionine, and oleic acid was determined in vivo close to hatch using 141Ce as a nonabsorbed reference substance. Glucose and methionine uptake was low posthatch and increased with age and feed intake. Oleic acid uptake was high at hatch and changed little with age. Increased intake of lipids depressed the percentage oleic acid absorption. Plasma concentrations of glucose, Na, phospholipids, and nonesterified fatty acids did not change with age. Triiodothyronine and triglyceride concentrations increased with age in the plasma of fed chicks but decreased during feed deprivation. Feed intake stimulated posthatch secretion of yolk to the small intestines and triggered uptake mechanisms for hydrophilic compounds.
本研究在孵化后的雏鸡中检测了卵黄利用在转运至循环系统和分泌至肠道之间的分配情况，并测定了一些代谢物的吸收和血浆浓度。胃肠道中存在饲料会增强卵黄向小肠的分泌。在孵化时接近孵化期时，使用¹⁴¹Ce作为非吸收性参考物质，在体内测定了葡萄糖、蛋氨酸和油酸的吸收情况。孵化后葡萄糖和蛋氨酸的摄取量较低，并随年龄和采食量增加。油酸摄取在孵化时较高，且随年龄变化不大。脂质摄入量增加会降低油酸吸收百分比。血浆中葡萄糖、钠、磷脂和非酯化脂肪酸的浓度不随年龄变化。在喂食的雏鸡血浆中，三碘甲状腺原氨酸和甘油三酯浓度随年龄增加，但在禁食期间降低。采食量刺激孵化后卵黄向小肠的分泌，并触发亲水性化合物的摄取机制。
