Replacing the Cock in a 45-Hen Desi Flock
Shri M. keeps 45 non-descript desi hens and three cocks in Kandhamal. One cock is the sire of the other two, and sons have been used for three generations. Hens average 55 eggs a year; hatchability is 62%; cockerels are sold at about 1.2 kg for Rs 420. Villagers pay Rs 8 for a desi egg against Rs 6 for a commercial egg, but only for eggs they trust as desi. The flock free-ranges around the homestead; there is no separate pen, and neighbours' cocks mix freely. Shri M. can buy an unrelated desi cock for Rs 800, or 100 Vanaraja day-old chicks for Rs 3,500, or a Vanaraja cock for Rs 600. His son wants to replace all three cocks with Vanaraja to get faster growth. Shri M. wants more eggs and quicker cockerels but does not want to lose the premium.
1. Compare the three options - an unrelated desi cock, 100 Vanaraja chicks, or a Vanaraja cock over the desi hens - against Shri M.'s market, flock size and risk. What do you recommend for the next 12 months?
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Start with the market, not the bird. The Rs 8 premium depends on the eggs and meat being accepted as desi; it is not a general poultry premium.
- Vanaraja chicks (100): They grow faster and can reach market weight sooner, but they need brooding, a 20–22% CP chick mash, clean water and a buyer who will pay for a commercial-type bird. If they are sold as desi, that is misrepresentation and the premium will not survive scrutiny. The investment of Rs 3,500 is also large relative to his current flock.
- Vanaraja cock over 45 desi hens: The F1 chicks grow faster than pure desi, but the offspring are not a stable breeding population. If he keeps F1 pullets and backcrosses, type and market acceptance become unpredictable. It also does not correct inbreeding if the hens themselves are related.
- Unrelated desi cock (Rs 800): Lowest cost, immediate inbreeding relief, and preserves the product that earns the premium.
Recommendation: buy two unrelated desi cocks from a distant village, keep one as a spare, quarantine both for two weeks, and use one at a time. Run a small separate trial of 25 Vanaraja birds only if he has a real buyer and can brood them properly. Do not put a Vanaraja cock over the whole flock in year 1 while still selling the output as desi. Reassess after the trial with actual feed cost, growth and price.
2. Set out a two-year breeding and replacement plan for the 45-hen flock, including how to stop neighbour cocks and what records to keep.
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The immediate genetic problem is that one sire has produced the next two cocks and those sons have been used for three generations. In a flock this small, that sharply raises inbreeding and can reduce hatchability, vigour and egg number.
Two-year plan
- Replace all current breeding cocks with two unrelated desi cocks from different villages. Keep a ratio of about 1 cock to 10–12 hens; with 45 hens, 3–4 cocks are enough for fertility, but only unrelated ones.
- Never keep a son of the current cock as the next sire. Replace working cocks every 12 months, or earlier if fertility falls.
- Identify hens individually with numbered wing bands. Record egg number over a fixed 6-month period using trap nests or daily nest checks, and record hatchability of eggs set from each hen.
- Hatch in two batches a year, about 100 eggs per batch. Rear 50–60 chicks, then select at 8 weeks on growth and survival and at 20 weeks on body size and age at first egg.
- Select replacement pullets from the best 25–30% of hens, not from the whole flock. Keep cockerels from the best families, not merely the biggest cockerel in the yard.
- Control neighbour cocks with a 1.5 m woven-wire boundary or by coordinating with neighbours so that only one village cock runs with the hens. Free-range mixing will undo any selection plan.
- Quarantine new cocks for 14 days and follow the local vaccination advice before mixing.
Records: hen number, eggs laid, eggs set, chicks hatched, chick weight at 8 weeks, mortality, cock used and dates. These records are more valuable than a pedigree claim.
3. Which traits should he record and select for, and which selection mistakes are most likely in a 45-hen flock?
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Select for traits that pay in his market and can be measured with 45 hens:
- Egg number over 6 months - moderate heritability, so use records rather than appearance.
- Age at first egg - early layers reduce cost per pullet.
- Broodiness - some broodiness is useful for natural hatching, but prolonged broodiness cuts egg number; decide the balance deliberately.
- Hatchability and chick vigour - low heritability, so use family information and management, not just the hen's looks.
- 8-week body weight and survival - useful for cockerel sales and flock hardiness.
- Egg weight and shell quality - important for the premium egg market.
- Temperament - hens that are easy to handle make record-keeping possible.
Likely mistakes
- Selling the best cockerels and keeping the poor ones as breeders.
- Selecting only the biggest eggs, which is weakly related to egg number and can reduce lay.
- Keeping one cock for many years because he looks impressive; this accelerates inbreeding.
- Selecting on a single hen's performance without considering her sisters and daughters.
- Recording only eggs sold, not eggs laid, eggs set and chicks hatched.
- Culling on appearance alone - pale comb, moult or a bad feather day is not a reliable guide to laying.
- Ignoring neighbour cocks, which makes the breeding plan meaningless.