Mineral Supplementation in Indian Dairy Cattle: Deficiency Physiology,and Dosing Correctly

Mineral imbalance is one of the most under-diagnosed constraints on fertility and milk output
in Indian dairy herds. Deficiencies rarely produce dramatic clinical signs; instead they show
up as anoestrus, repeat breeding, retained placenta, poor growth in replacement heifers and
lower lactation yields. For vets, nutritionists and distributors advising farmers, the practical
question is how to choose and dose a mineral mixture so it corrects the real deficit without
wasting money or causing toxicity
Why deficiencies are widespread
Most Indian dairy animals are fed crop residues – wheat straw (bhusa) and paddy straw – with
limited green fodder and concentrate. Crop residues are inherently low in phosphorus and in
several trace elements, and soil mineral status, and therefore forage mineral content, varies
widely between districts. NDDB’s ration-balancing surveys and ICAR mineral-mapping work
(notably by ICAR-NIANP, Bengaluru) have reported that deficiencies are region-specific,
with calcium, phosphorus, zinc, copper and manganese among the most commonly deficient
elements. This regional variability is the scientific basis for area-specific mineral mixtures.
What each mineral does on the farm
Calcium drives muscle contraction, including uterine and teat-sphincter tone, and supports
immune cell function. Hypocalcaemia around calving predisposes to retained placenta,
abomasal displacement and mastitis.
Phosphorus underpins energy metabolism, rumen microbial growth and ovarian activity.
Chronic shortage classically shows up as anoestrus and pica.
Zinc maintains the keratin of hoof and teat canal and supports epithelial repair and immunity.
Copper is part of enzyme systems involved in energy production and antioxidant defence.
Deficiency affects fertility, immunity and coat colour. High molybdenum, sulphur or iron in
the diet or water can lock it up even when the ration looks adequate on paper.

Manganese is needed for steroid hormone synthesis. Low status is associated with silent
heats and poor conception.
Cobalt allows rumen microbes to produce vitamin B12. Deficiency means poor appetite and
ill-thrift.
Iodine is essential for thyroid hormones. Shortfalls are linked to weak or stillborn calves and
retained placenta.
Selenium, working with vitamin E, protects immune cells from oxidative damage.
Deficiency contributes to retained placenta and white muscle disease in calves.
Confirming a deficiency before changing products
Anoestrus, pica and poor coat are non-specific, so a diagnosis should be backed by evidence
wherever possible.

• Review the ration. Establish the share of straw, green fodder and concentrate, and
  whether any mineral product is already being fed.
• Analyse feed and fodder. Milk unions and ration-balancing programmes can often
  arrange this.
• Test blood at group level. Calcium, inorganic phosphorus and magnesium can be
  assessed in serum. Sample several animals at the same stage of lactation rather than a
  single cow.
• Choose the right sample for trace elements. Serum is a poor mirror of copper and
  selenium status. Liver tissue or whole-blood glutathione peroxidase activity gives a
  more reliable picture.
  Interactions also matter. Adding calcium to a straw-based ration that is already short of
  phosphorus can widen the calcium-to-phosphorus gap. Copper may be present in adequate
  amounts yet unavailable because of antagonists in feed or water. These are strong reasons to
  prefer a complete, balanced mixture over single-element products.
  Reading a mineral mixture label
  In India, livestock mineral mixtures are governed by IS 1664, which sets minimum levels for
  major and trace minerals, distinguishes types (for example, with or without common salt) and

limits contaminants such as fluorine and lead. When a farmer asks you about a product, check
the following.

• The bag states compliance with IS 1664 and declares the type.
• A full composition panel lists calcium, phosphorus, magnesium and every trace
  element in g or mg per kg. Vague claims such as “contains minerals and vitamins”
  with no quantities are a warning sign.
• Phosphorus content deserves special attention. It is usually the costliest macro-
  mineral and the one most likely to be under-formulated in cheap products.
• The trace mineral sources are declared (sulphate, oxide, chelate or proteinate), along
  with batch number, manufacture and expiry dates and the manufacturer’s address.
  Inorganic or chelated trace minerals?
  Chelated trace minerals, where the metal is bound to amino acids, peptides or
  polysaccharides, can be better absorbed than some inorganic salts, partly because they are
  less affected by antagonists in the rumen. Oxides are generally less available than sulphates.
  Chelates are attractive for high-yielding and transition cows, but they cost more.
  In practice, a well-formulated inorganic mixture that meets IS 1664 and is fed every day will
  outperform an expensive product given erratically. Where budgets allow, partly replacing
  inorganic sources with chelated ones is a sensible compromise, particularly for animals
  around calving.
  Area-specific mineral mixtures
  Area-specific mineral mixtures are developed from the analysis of feeds and fodders in a
  given region and are typically distributed through milk unions and state animal husbandry
  departments, often alongside ration-balancing advice. Where one is available for your district,
  it is usually the most cost-effective place to start, because it is designed around what local
  animals are actually missing.
  Dosing and routine
  Follow the dose on the label. As a general guide, advisories commonly suggest around 50 to
  60 g per day for an adult dairy animal, with proportionally less for calves and heifers. A
  nutritionist may adjust this according to ration analysis and milk yield. Some practical rules:
• Feed daily, mixed into the concentrate. Occasional large doses are wasteful and
  unreliable.
• Continue through the dry period, since pre-calving mineral status influences disease
  risk after calving.
• Do not combine several mineral products. Copper and selenium have narrow safety
  margins, and total dietary selenium should stay near 0.3 mg per kg of dry matter.
• Remember that salt alone is not a mineral supplement.
• Be patient. Fertility improvements take months, not days. If problems persist, reassess
  the whole ration and the animal rather than simply raising the dose.
  Conclusion
  For many farmers, the local distributor is the first source of advice, so the standards applied
  there matter. Stock products that comply with IS 1664 and carry complete composition
  panels. Explain the dose and the importance of feeding through the dry period. Avoid any
  product or sales pitch that guarantees a specific yield increase. Apply the same label checks
  to every brand, whether commercial or cooperative. Advice that is consistent, honest and
  based on evidence builds lasting trust and keeps the focus on herd health and farm
  profitability.