Danisco Animal Nutrition, Marlborough, SN8 1XN UK.
Poult Sci. 2012 Apr;91(4):943-7. doi: 10.3382/ps.2011-01922.
The present experiment examined the influence of xylanase supplementation and a blend of essential oils (EO; cinnamaldehyde and thymol) on performance and Salmonella horizontal transmission in broiler chickens challenged with Salmonella. Two thousand 1-d-old broiler chicks were randomly assigned to 5 dietary treatments (8 pens/treatment of 50 male broilers each). Four dietary treatments were challenged with Salmonella: 1) control, 2) basal diets supplemented with EO, 3) basal diet supplemented with xylanase (2,000 U/kg of feed), and 4) basal diet supplemented with a combination of EO and xylanase (2,000 U/kg of feed). One treatment served as an unchallenged control and was not supplemented with either additive. Broiler starter and finisher diets, based on wheat and soybean meal, were formulated, pelleted, and fed ad libitum. At d 1, before placement, half of the birds from each pen were tagged and dosed with Salmonella enterica serovar Heidelberg (5 × 10(5) cfu/mL). On d 42, 5 random untagged birds from each pen were killed and their ceca removed and tested for Salmonella. Performance data were analyzed as a completely randomized design using GLM. The frequency of positive Salmonella in the untagged birds was compared between treatments by using a chi-squared test of homogeneity. Challenging the birds with Salmonella had no effect (P > 0.05) on any of the measured performance parameters. Xylanase and EO supplementation improved (P < 0.05) the 42-d BW gain and feed efficiency, with no effect (P > 0.05) on feed intake, compared with that of the control treatment. Xylanase supplementation improved (P < 0.05) BW gain and feed efficiency compared with the results of EO supplementation. The combination treatment of xylanase and EO numerically improved BW gain and feed efficiency compared with the xylanase treatment. Xylanase and EO supplementation reduced (P < 0.05) the incidence of horizontal transmission of Salmonella infection between birds by 61 and 77%, respectively, compared with the control. The results of the current study suggested that dietary addition of EO and xylanase could improve broiler performance and contribute to food safety by lowering the incidence of horizontal transmission of Salmonella infection.
本实验研究了木聚糖酶和精油（肉桂醛和百里香酚）混合物添加对感染沙门氏菌肉鸡生产性能和沙门氏菌水平传播的影响。2000 只 1 日龄肉鸡随机分为 5 个饲粮处理组（每组 8 个重复，每个重复 50 只雄性肉鸡）。4 个饲粮处理组对肉鸡进行了沙门氏菌攻毒：1）对照组，2）基础饲粮添加精油，3）基础饲粮添加木聚糖酶（2000U/kg 饲粮），4）基础饲粮添加精油和木聚糖酶混合物（2000U/kg 饲粮）。1 个处理组作为未攻毒的对照组，不添加任何添加剂。以小麦和豆粕为基础配制肉鸡前期和后期饲粮，制粒并自由采食。在 1 日龄，放置前，每个重复的一半鸡只被标记并口服接种肠炎沙门氏菌血清型海德堡（5×10（5）CFU/mL）。在 42 日龄时，每个重复随机选择 5 只未标记鸡只处死，取盲肠并检测沙门氏菌。采用完全随机设计，利用 GLM 分析生产性能数据。采用卡方检验比较未标记鸡只中沙门氏菌阳性的频率。沙门氏菌攻毒对所有测定的生产性能参数均无影响（P＞0.05）。与对照组相比，木聚糖酶和精油添加分别提高（P＜0.05）了 42 日龄体重和饲料效率，而对采食量无影响（P＞0.05）。与精油添加相比，木聚糖酶添加提高了体重和饲料效率。与木聚糖酶处理相比，木聚糖酶和精油联合处理在数值上提高了体重和饲料效率。木聚糖酶和精油添加分别使鸡只之间沙门氏菌感染的水平传播发生率降低了 61%和 77%，与对照组相比差异显著（P＜0.05）。本研究结果表明，饲粮添加精油和木聚糖酶可以改善肉鸡生产性能，通过降低沙门氏菌感染的水平传播发生率来提高食品安全。
