Ramirez Swanny Y, Peñuela-Sierra Lina M, Ospina Maria A
Department of Veterinary Medicine and Animal Science , Faculty of Veterinary Medicine and Animal Science, University of Tolima, Ibagué, Colombia.
Department of Biology, Faculty Science, University of Tolima, Ibagué, Colombia.
Vet World. 2021 Mar;14(3):595-602. doi: 10.14202/vetworld.2021.595-602. Epub 2021 Mar 9.
The use of antibiotics as growth promoters in the feed of poultry, has contributed to an increase in the antimicrobial resistance of foodborne pathogens worldwide. Hence, the development of new effective alternatives to antibiotics that do not hinder productivity is imperative. For this, the aim of the present study was to determine whether oregano essential oil (OEO) extracted from is a suitable alternative to growth-promoting antibiotics (GPAs) for improving the performance, egg quality, and intestinal morphometry of ISA Brown laying hens.
A total of ninety-six 70-week-old ISA Brown laying hens were randomly assigned to four treatment groups with four replicates per treatment and six hens per replicate. The treatments consisted of four different diets that were formulated according to the nutritional requirements of the genetic line and the production phase with and without the addition of GPA and OEO: NC, which did not contain OEO or GPA; GPA, which included 50 ppm zinc bacitracin as a GPA; 80OEO, which included 80 ppm OEO and no GPA; and 150OEO, which included 150 ppm OEO and no GPA.
All of the OEO and GPA treatment groups had a better feed conversion ratio than the NC group. However, the addition of 150 ppm OEO to the diet improved the percentage egg production and egg mass, as well as the external and internal quality of the egg compared with the other treatments. In addition, both the 80OEO and 150OEO treatments improved the yolk color, shell thickness, and shell color, as well as parameters related to the intestinal morphometry compared with the NC group.
The findings of this study indicate that 150 ppm OEO can be used as a substitute for GPA to improve the performance, egg quality, and parameters related to the intestinal morphometry of ISA Brown laying hens.
在家禽饲料中使用抗生素作为生长促进剂，已导致全球食源性病原体的抗菌耐药性增加。因此，开发不影响生产力的新型有效抗生素替代品势在必行。为此，本研究的目的是确定从牛至中提取的牛至精油（OEO）是否是生长促进抗生素（GPA）的合适替代品，以改善ISA Brown蛋鸡的生产性能、蛋品质和肠道形态。
总共96只70周龄的ISA Brown蛋鸡被随机分配到四个处理组，每个处理有四个重复，每个重复有六只母鸡。处理包括四种不同的日粮，根据遗传品系和生产阶段的营养需求配制，添加或不添加GPA和OEO：NC，不含有OEO或GPA；GPA，包含50 ppm杆菌肽锌作为GPA；80OEO，包含80 ppm OEO且不含有GPA；150OEO，包含150 ppm OEO且不含有GPA。
所有OEO和GPA处理组的饲料转化率均优于NC组。然而，与其他处理相比，在日粮中添加150 ppm OEO可提高产蛋率和蛋重百分比，以及蛋的外观和内部品质。此外，与NC组相比，80OEO和150OEO处理均改善了蛋黄颜色、蛋壳厚度和蛋壳颜色，以及与肠道形态相关的参数。
本研究结果表明，150 ppm OEO可作为GPA的替代品，以改善ISA Brown蛋鸡的生产性能、蛋品质和与肠道形态相关的参数。
