Application scope for Dijincao Powder Veterinary Grade API is restricted to five downstream production routes where the dried aerial-part botanical is processed without isolation of a single marker. The powder is identified as Euphorbia humifusa Willd. aerial parts; because no globally harmonized monograph exists for all jurisdictions, each receiving country’s pharmacopoeia, feed catalogue, or marketing authorization governs specification limits. The following sections state arithmetic addition ratios relative to finished unit mass or volume; they are dosage-formulation examples, not clinical efficacy claims.

During the first 7 to 10 days after weaning, the powder is incorporated into dry oral granules that are dispensed through proportioner feeders in high-density swine barns. The raw powder must be pre-sieved to D90 ≤ 75 µm by USP <786>; a tail fraction above 150 µm causes segregation in auger-driven dosing hoppers, a batch-to-batch variance issue observed on production farms when the crushing mill is operated with worn hammer screens.

Compliance anchor: For a veterinary medicinal granule, the dossier structure follows Directive 2001/82/EC as amended by Regulation (EU) 2019/6, Annex II; where the product is registered in China, the granule general chapter of the Chinese Veterinary Pharmacopoeia applies and the crude powder must meet the botanical drug monograph for identity, total ash, acid-insoluble ash, and loss on drying. Loss on drying is controlled at ≤5.0% by USP <731> before granulation; heavy metals are checked by USP <232>/<233>. Pre-drying is mandatory whenever ambient RH >60% has raised the raw-powder moisture above 6.0%.

Addition arithmetic: A 10 g finished granule sachet delivering 2.5 g of dried powder API corresponds to 25% w/w API loading. The remaining 75% w/w is a water-soluble carrier composed of dextrose monohydrate 60%, citric acid 10%, and sodium carboxymethyl cellulose 5%.

Downstream manufacture: The powder is preblended with half the carrier in a 500 L high-shear granulator, then 5% w/v PVP K30 solution is sprayed at 50–100 mL/min. Granulation runs at impeller speed 200 rpm and chopper speed 1500 rpm until wet mass reaches 8–10% moisture; transfer to a fluid-bed dryer with inlet air 55–65°C is completed before product temperature exceeds 45°C because tannin-rich material darkens and forms hard agglomerates under elevated thermal load. Dried granules are passed through a 1.0 mm oscillating sieve and packaged under ≤40% RH to prevent hygroscopic caking.

Terminal dosage forms: 5 g and 10 g foil sachets, 25 kg bagged granule for liquid proportioner reservoirs, and direct oral syringe paste when the granule is dispersed in water immediately before administration.

What Limits Suspension Uniformity in Poultry Drinking-Water Delivery?

Drinking-water delivery of Dijincao powder is constrained by the settling rate of tannin-rich particles rather than by true aqueous solubility. A farm stock solution at 1 kg concentrate per 100 L water produces a coarse dispersion; if hardness exceeds 200 mg/L as CaCO₃, calcium ions accelerate precipitation and can block proportioner diaphragms. Physical stability is therefore measured by suspensibility according to CIPAC MT 184 and particle size by laser diffraction according to ISO 13320:2020; the release target is ≥80% suspensibility after 30 min in a 250 mL standard hard-water column.

Concentrate loading: The water-dispersible powder is manufactured at 10% w/w Dijincao powder with lactose monohydrate and citric acid as acidic carrier. When the farm dosing pump is set at 1:100 dilution, the final drinking line contains 100 mg/L of concentrate, equivalent to 10 mg/L crude powder. This arithmetic relation must be recalculated for nipple drinker lines because dead-leg volumes and biofilm can sequester suspended solids.

Line process: Dry blending is performed in a 1000 L V-blender for 30 min. The Dijincao fraction must be pre-micronized to D90 ≤ 45 µm; if the raw powder retains particles above 75 µm, a wet-milling step with 0.1–0.3% w/w xanthan gum is inserted before spray drying. Spray-drying inlet temperature 140–160°C and outlet 70–80°C are typical for botanical suspensions, but published Dijincao-specific polyphenol recovery after spray drying is limited; batch release therefore includes Folin-Ciocalteu total polyphenol assay against the unprocessed powder. Avoid blending with amine-based effervescent systems because the acidic carrier and tannins release carbon dioxide prematurely in humid storage.

Terminal dosage forms: 100 g, 1 kg, and 5 kg water-dispersible powder containers dosed through proportioner pumps into bell or nipple drinker lines; not intended for dry direct administration.

Recurrent calf enteritis on milk replacer lines pushes formulators toward a robust direct-compression bolus rather than a capsule because the dose volume requires a hard unit that can be delivered by balling gun. Direct compression of Dijincao powder is only feasible when the supplier CoA shows bulk density ≥0.45 g/mL and angle of repose ≤35°; lower-density powder must be dry-granulated or slugged before final compression to prevent weight variation and poor die filling on rotary presses.

Compliance anchor: Tablet hardness is held at 5–8 kp on a Schleuniger hardness tester, friability is ≤1.0% by USP <1216>, and disintegration is ≤30 min in 900 mL water at 37±2°C by USP <701>. The formula avoids magnesium stearate above 0.5% w/w because over-lubrication forms a hydrophobic film that extends disintegration beyond compendial limits at the center of a 20 g bolus.

Addition arithmetic: A 20 g calf bolus containing 5 g powder API corresponds to 25% w/w. Scored tooling permits splitting to 10 g for animals below 50 kg body weight; hardness uniformity across the bisect must be verified by measuring both halves after split.

Downstream manufacture: If wet granulation is needed, the powder is mixed with microcrystalline cellulose and lactose in a twin-screw mixer granulator with L/D 20:1 at screw speed 120 rpm, then dried in a fluid bed to ≤3.0% moisture. Final compression runs on a 16-station rotary press with precompression 5–10 kN and main compression 15–25 kN; the granules are blended with croscarmellose sodium 2% w/w and magnesium stearate 0.5% w/w immediately before compression.

Terminal dosage forms: 20 g oral bolus, 1 g and 2 g tablets for younger calves, and 500 mg oral capsule when a dosator-type capsule filler can handle granulated powder with flow aid 0.25% w/w colloidal silicon dioxide.

Aqueous Extraction and Heat-Labile Polyphenol Stability in Injectable Solutions

For injectable preparations, the powder is not aseptically suspended; it is converted into a purified aqueous extract before sterilization. The extraction sequence uses 100 kg dried powder in 1000 L purified water, decocted at 95–100°C for 1 h per stage over two stages. The combined decoction is concentrated under vacuum at ≤70°C to 10% of original volume, then ethanol is added to 60–70% v/v and the solution is cold-settled at 4°C for 48 h. The supernatant is filtered through 0.45 µm and 0.22 µm PVDF membranes, adjusted to pH 5.5–6.5, filled into 10 mL amber ampoules under Grade B area with Grade A laminar flow, and terminally sterilized at 121°C for 15 min.

Regulatory tests: Sterility is verified by USP <71>, bacterial endotoxins by USP <85>, and particulate matter by USP <788>. The aseptic and terminal-sterilization process must comply with EudraLex Volume 4, Annex 1. If the injection is registered in China, the sterile preparation must also meet the injection general chapter of the Chinese Veterinary Pharmacopoeia; no USP monograph for Dijincao injection exists, so the submitted specifications rely on the manufacturer’s validated drug master file and stability data.

Addition arithmetic: The batch formula uses a drug-to-solution ratio of 1:10, meaning each 10 mL ampoule corresponds to 1 g crude dried powder. Tonicity is adjusted with sodium chloride 0.85% w/v; the final solution must remain free of visible precipitate after 24 h at 25°C and after one freeze-thaw cycle when storage at 2–8°C is used.

Process boundaries: Polyphenol-containing extracts chelate iron from unprotected carbon steel; after the extraction stage, all product-contact surfaces are specified as 316L stainless steel or glass-lined equipment. Color instability occurs when the solution is held above 70°C for more than 2 h, so intermediate cooling to ≤25°C within 30 min after vacuum concentration is mandatory. Residual polysaccharides can clog membrane filters; a prefiltration step through 0.8 µm polypropylene depth filters is used before the first sterilizing-grade membrane. Do not combine this extract with oxidizing sterilants or strong alkaline diluents without forced degradation studies.

Terminal dosage forms: 10 mL and 20 mL injectable ampoules, 50 mL multi-dose vials preserved with benzyl alcohol 1.5% v/v where regulatory status permits, and 100 mL bulk solutions for farm administration under veterinary supervision.

When Antibiotic-Free Grower Diets Require a Phytogenic Premix Intermediate

In feed-mill operations, Dijincao powder is handled as an intermediate premix rather than as a direct final feed ingredient. The primary line risk is cross-contamination when the same mixer is used for ionophore coccidiostats or other medicated articles; cleaning validation by marker recovery and swab limits is required before switching to a botanical premix. For a 10% w/w Dijincao masterbatch on corn cob carrier, the arithmetic addition to finished meal feed is 2–5 kg/t depending on target crude herb equivalent of 200–500 g/t; a target of 0.5 g/kg complete feed equals 5 kg of 10% premix per metric ton.

Regulatory classification: In the EU, a botanical feed material is listed only if it meets the definition in Regulation (EU) No 68/2013; any functional gut-health claim triggers feed additive status under Regulation (EU) No 1831/2003. In the United States, the ingredient must be acceptable under the AAFCO Official Publication, and the facility must comply with 21 CFR 507 Current Good Manufacturing Practice for animal food. Heavy metals are verified by USP <232>/<233>, and aflatoxin B1 is screened by LC-MS/MS with an action limit aligned to the receiving country’s feed regulations.

Line process: The masterbatch is mixed in a double-ribbon mixer for 15 min; blend uniformity is confirmed by tracer salt test with coefficient of variation ≤5%. The premix is metered into the main feed mixer through a micro-ingredient skid. Pelleting is performed at conditioning temperature 70–85°C for 30–60 s and die compression 2–3 MPa. Published Dijincao-specific thermal degradation kinetic data under feed pelleting is limited; total polyphenol recovery after pelleting must be checked with Folin-Ciocalteu against the pre-pelleting meal. If recovery falls below 90%, the premix addition rate is recalculated upward or the conditioner temperature is reduced to the lower end of the range.

Terminal dosage forms: 5 kg, 20 kg, and 25 kg polyethylene-lined bags of 10% masterbatch; mash feed, 3 mm and 5 mm pelleted complete feed; and 1 kg dosing packs for on-farm top dressing. The powder is not suitable for high-molasses block production unless the premix is pre-encapsulated or the block is cold-pressed, because extended heating in molasses blending can accelerate polyphenol oxidation.