Ingredient composition and nutrient content of experimental diets (on an air dry basis).

1Probiotic treatment was provided by the addition of ∼1010 spores/day of Bacillus pumilus WIT 588 to the non-medicated treatment.
2Lactofeed 70 contains 70% lactose, 11.5% protein, 0.5% oil, 7.5% ash, and 0.5% fiber (Volac, Cambridge, UK).
3Provided the following per kg of complete starter diet: Cu, 155 mg; Fe, 90 mg; Mn, 47 mg; Zn, 120 mg; I, 0.6 mg; Se, 0.3 mg; vitamin A, 6000 IU; vitamin D3, 1000 IU; vitamin E, 100 IU; vitamin K, 4 mg; vitamin B12, 15 µg; vitamin B1, 2 mg; vitamin B6, 3 mg; riboflavin, 2 mg; nicotinic acid, 12 mg; pantothenic acid, 10 mg and choline chloride, 250 mg.
4Natuphos 5000 (BASF SE, Lampertheim, Germany).
5Phase 1 and 2 medicated diets contained 200 mg apramycin per kg provided from Apralan G200, (Elanco Animal Health, Eli Lilly & Co., Basingstoke, Hampshire, UK).
6Phase 1 and 2 medicated diets contained 2500 mg of elemental zinc per kg provided from supplemental zinc oxide (Zincotec; Provimi Ltd., NuTec Mill, Eastern Avenue, Lichfield, Staffordshire, UK) and nutritional zinc included in the vitamin and mineral premix.
7Calculated values.

1. 益生菌干预方案为向非药用日粮中添加每日约1×10¹⁰个芽孢的短小芽孢杆菌（Bacillus pumilus）WIT 588
2. Lactofeed 70含70%乳糖、11.5%粗蛋白、0.5%粗脂肪、7.5%灰分及0.5%粗纤维（Volac，英国剑桥）
3. 每千克全价开食日粮添加如下营养组分：铜（Cu）155 mg、铁（Fe）90 mg、锰（Mn）47 mg、锌（Zn）120 mg、碘（I）0.6 mg、硒（Se）0.3 mg；维生素A 6000国际单位（IU）、维生素D3 1000 IU、维生素E 100 IU、维生素K 4 mg、维生素B12 15 µg、维生素B1 2 mg、维生素B6 3 mg、核黄素2 mg、烟酸12 mg、泛酸10 mg以及氯化胆碱250 mg
4. Natuphos 5000（德国巴斯夫欧洲公司，BASF SE，德国兰佩特海姆）
5. 第1、2阶段的药用日粮中每千克添加200 mg安普霉素，该组分由Apralan G200提供（Elanco动物保健公司，礼来公司（Eli Lilly & Co.），英国汉普郡贝辛斯托克）
6. 第1、2阶段的药用日粮中每千克添加2500 mg元素锌，其来源包括补充型氧化锌（Zincotec；Provimi有限公司，英国斯塔福德郡利奇菲尔德东部大道NuTec工厂）以及维生素矿物质预混料中含有的营养性锌
7. 计算值