Department of Biology, University of Mount Union, Alliance, OH 44601, USA.
Poult Sci. 2011 Sep;90(9):2041-6. doi: 10.3382/ps.2011-01347.
This study investigated the effects of delayed access to feed and water on early duckling growth, selected aspects of intestinal physiology, and immune responses. Ducklings were assigned to one of 2 experimental groups. In one treatment group (referred to as the fed group), feed and water were provided beginning on d 0, and in the other treatment group (referred to as the withheld group), feed and water were withheld until d 2. The ducklings in the withheld treatment had lower BW at 2 and 6 d posthatch than ducklings in the fed group. At 8 d posthatch (6 d postfeeding), the BW of the ducklings in the withheld group was comparable to the BW of the 6-d-old ducklings in the fed group. At 2 d posthatch, withheld ducklings had lower absolute and relative duodenum plus pancreas weight than fed ducklings. At 8 d posthatch (6 d postfeeding), withheld ducklings had higher absolute and relative duodenum plus pancreas weight than fed ducklings at 6 d posthatch. At 2 d posthatch, mucin 5B mRNA content was approximately 2 times lower in withheld ducklings (P = 0.09) than in fed ducklings. At 6 d posthatch, mucin 5b mRNA content was approximately 2.5-fold higher in withheld ducklings (P = 0.07) than in fed ducklings. Delayed access to feed and water increased the CD25(+) cell number in the cecal tonsil at 2, 6, and 8 d posthatch. The IL-10 content of CD25(+) cells was higher in the withheld ducklings than in the fed ducklings at 2 and 6 d posthatch. In conclusion, delaying access of ducklings with no experimental pathogen infection to feed and water has no long-term effects on early growth parameters, intestinal physiology, and immune responses.
本研究旨在探讨延迟给予饲料和水对雏鸭早期生长、肠道生理和免疫反应的影响。雏鸭被分配到两个实验组中的一个。在一个处理组（称为喂养组）中，从第 0 天开始提供饲料和水，而在另一个处理组（称为扣留组）中，扣留饲料和水，直到第 2 天。扣留组的雏鸭在孵化后第 2 天和第 6 天的体重低于喂养组的雏鸭。在孵化后第 8 天（喂养后第 6 天），扣留组的雏鸭体重与喂养组的第 6 天龄雏鸭体重相当。在孵化后第 2 天，扣留组的雏鸭的十二指肠加胰腺的绝对重量和相对重量均低于喂养组的雏鸭。在孵化后第 8 天（喂养后第 6 天），扣留组的雏鸭的十二指肠加胰腺的绝对重量和相对重量均高于孵化后第 2 天的喂养组的雏鸭。在孵化后第 2 天，扣留组的雏鸭的粘蛋白 5B mRNA 含量比喂养组低约 2 倍（P = 0.09）。在孵化后第 6 天，扣留组的雏鸭的粘蛋白 5B mRNA 含量比喂养组高约 2.5 倍（P = 0.07）。延迟给予无实验性病原体感染的雏鸭饲料和水会增加孵化后第 2、6 和 8 天盲肠扁桃体中 CD25+细胞的数量。在孵化后第 2 天和第 6 天，扣留组的雏鸭的 CD25+细胞中的 IL-10 含量高于喂养组的雏鸭。总之，延迟给予无实验性病原体感染的雏鸭饲料和水对早期生长参数、肠道生理和免疫反应没有长期影响。
