Dark spot eggs (watermark eggs) occur due to water seeping through the pores of the eggshell, significantly reducing the selling price of eggs. They are more common in hens of old age and during hot seasons. It is difficult to completely solve this problem with a single approach. A comprehensive app···

First, there are defects in the structure of the eggshell and the eggshell membrane. The fibers of the eggshell membrane are loose, the thickness is insufficient, the gap between the eggshell papillary layer increases, and the density of the palisade layer is low, which leads to easy leakage of mois···

4 high-performance liquid chromatography (HPLC) 4.1 principle: chromatograph test sample, in turn, add water and methanol, 25 hydroxy vitamin D3, ultrasonic extraction, is measured by high performance liquid chromatograph external standard method. 4.2 Reagents or Materials4.2.1 Water: GB/T 6682···

1. Background and Objectives D-NOVO ® is a 25-hydroxy vitamin D3 product independently developed by Key Ingredients Biotechnology (Yi Chang) Co., Ltd. utilizing proprietary advanced biotechnology. D-NOVO ® is characterized by superior stability, high bioavailability, excellent mixing uniformi···

1. Experiment BackgroundCurrently, in the egg-laying chicken breeding process, as the breed is improved and the laying cycle is extended (target at 100 weeks of age), the metabolic pressure of the egg-laying chickens reaches its limit. 25-hydroxyVitamin D3, as the active metabolite of vitamin D···

1. Experiment Background In modern intensive pig farming, sow reproductive performance is one of the core indicators determining the economic benefits of pig farms. The period around weaning is a critical regulatory stage for follicle development and oocyte maturation in sows, while the early g···

1. Experiment Background Vitamin D₃ is a key nutrient for maintaining poultry health and production performance. It needs to be converted into its active form in the liver and kidneys to exert physiological functions. However, this conversion process is easily affected by factors such as liver···

1. Experiment Background The lifetime productivity of sows is a core indicator determining the economic benefits of pig farms. The annual culling rate of sows in large-scale pig farms is approximately 40%-50%, among which reproductive disorders and limb-hoof problems are two key factors affecti···

Abstract This experiment aimed to explore the effects of dietary supplementation of LIQI99 on the production performance, intestinal health of laying hens, and the reduction of Salmonella contamination in eggs, and to determine its appropriate supplementation level and mechanism of action. A to···

The casting is prone to porosity defects1. The high mud content of the molding sand will lead to the decrease of the permeability of the molding sand, the increase of water, and the porosity defect of the casting is easy to appear. If the silica sand, bentonite and pulverized coal used in the f···