What are breeding mice fed? - briefly
Breeding colonies receive a nutritionally complete rodent chow formulated for high protein (typically 18‑20%) and energy, supplemented with occasional seeds, grains, and fresh vegetables. Water is provided ad libitum, and the diet is adjusted during gestation and lactation to meet increased nutritional demands.
What are breeding mice fed? - in detail
Breeding colonies require a nutritionally balanced diet that supports gestation, lactation, and rapid growth of offspring. The core component is a high‑quality, laboratory‑grade rodent chow formulated for reproductive performance. Such chow typically contains 18–20 % protein, adequate levels of essential amino acids, and a calibrated mix of vitamins (A, D, E, K, B‑complex) and minerals (calcium, phosphorus, magnesium, zinc, selenium). Energy density is maintained at 3.0–3.5 kcal g⁻¹, with a moderate fat content (4–6 %) to prevent obesity while supplying sufficient calories for milk production.
Supplementary feeds address specific physiological stages:
- Pregnant females: additional 2–3 % soy or casein protein, 0.5 % extra calcium, and a modest increase in vitamin E to mitigate oxidative stress.
- Lactating females: 5–6 % extra calories from corn oil or safflower oil, plus 0.2 % extra vitamin D to support calcium absorption for milk synthesis.
- Weaning pups (21 days onward): soft mash or pelleted diet with 20–22 % protein, reduced fiber, and increased omega‑3 fatty acids to promote neural development.
Water must be provided ad libitum, filtered and free of chlorine. Bottles should be inspected daily for leaks and contamination. When using gel packs, ensure they contain only sterile electrolyte solution without added sugars, which can alter gut flora.
Hygiene and storage practices affect diet integrity:
- Keep bulk feed in airtight containers at 4–8 °C to prevent mold growth.
- Rotate stock on a first‑in, first‑out basis; discard any feed older than six months.
- Avoid supplemental treats high in fat or sugar (e.g., seeds, nuts, fruit) except as occasional enrichment, because they can disrupt the intended nutrient balance and lead to reproductive suppression.
Monitoring body condition scores weekly and adjusting feed quantities based on litter size, parity, and weight gain ensures optimal reproductive output and animal welfare.