Department of Animal Science, Veterinary School, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Res Vet Sci. 2022 Dec 20;152:610-617. doi: 10.1016/j.rvsc.2022.09.020. Epub 2022 Sep 23.
The present study aimed to determine the effects of egg type (nest clean or floor eggs) on eggshell microbiological, hatching performance, chick quality, yolk sac microbiology, and the interaction between egg type and post-hatch use of ceftiofur on broiler performance at 7, 14, 21, 28 and 35 days. A total of 2500 fertile eggs were obtained from a commercial flock of Cobb Slow® broiler breeders. Half of the eggs were collected directly from the floor, and the other half were collected from the nests. Microbiological evaluation of eggshells was performed before and after sanitization. After hatching, 420 male chicks were randomly selected and distributed in a completely randomized design in a 2 × 2 factorial scheme, separated by the type of egg (clean nest or floor) and the inclusion or not of subcutaneous ceftiofur, totaling four treatments. Egg type did not influence hatchability although the contamination level was 1.3% higher. The body weight and body weight gain of chicks at seven days were greater for chicks from nest eggs that received ceftiofur than chicks from floor eggs that also received ceftiofur. There was no interaction between the studied factors or individual effects for performance at 14, 21, 28, and 35 days. It is concluded that incubation of floor eggs, after standard sanitization, does not influence the hatch results and chick quality. Furthermore, it has been proven that the use of ceftiofur is unnecessary when there is correct management during broiler rearing.
本研究旨在确定蛋型（巢清洁或地面蛋）对蛋壳微生物学、孵化性能、雏鸡质量、蛋黄囊微生物学以及蛋型与孵化后使用头孢噻呋对 7、14、21、28 和 35 日龄肉鸡性能之间相互作用的影响。从商业科布慢®肉鸡种鸡群中获得了 2500 枚可孵化的种蛋。一半的蛋直接从地面收集，另一半从巢中收集。在消毒前后对蛋壳进行微生物评估。孵化后，随机选择 420 只雄性小鸡，并以完全随机设计的方式分配在 2×2 析因方案中，按蛋型（清洁巢或地面）和是否皮下注射头孢噻呋分为四个处理组。虽然污染水平高出 1.3%，但蛋型并没有影响孵化率。接受头孢噻呋治疗的巢蛋孵化的小鸡在 7 日龄时的体重和体重增重都高于接受头孢噻呋治疗的地面蛋孵化的小鸡。在 14、21、28 和 35 日龄时，研究因素之间没有相互作用或个别因素对性能的影响。研究结论是，经过标准消毒的地面蛋孵化不会影响孵化结果和雏鸡质量。此外，当肉鸡饲养管理正确时，使用头孢噻呋是不必要的。
