Cobb 500 vs Ross 308 in Zimbabwe: A Direct Comparison

Performance at Day 42 (Zimbabwe Conditions)

Cobb 500 target: 2,400g average, FCR 2.27, dressout 74%. Ross 308 target: 2,550g average, FCR 2.19, dressout 75%. Ross 308 has the edge on paper: slightly heavier birds, slightly better feed conversion, and fractionally better dressout. On a 500-bird batch, better FCR means 140 fewer kg of feed consumed for the same final weight. At $0.68 per kg feed, that is $95 less spent on feed per batch. The difference is real but it only materialises with good management. An under-managed Ross 308 flock will perform worse than a well-managed Cobb 500 flock.

When to Choose Cobb 500

Cobb 500 is the right choice for most Zimbabwe farmers because it is more forgiving of management variation. It tolerates feed quality fluctuations better than Ross 308. It is available from a wider range of hatcheries. It requires less precise brooding discipline in the first 7 days. If your power supply is unreliable, your feed source is variable, or you are placing your first batch, Cobb 500 is the lower-risk starting point. It is also the benchmark used by FarmIQ's automatic FCR alerts, all national benchmarks, and this website's profitability calculations.

When to Choose Ross 308

Ross 308 becomes the right choice when you have consistent brooding infrastructure, reliable high-protein starter feed (minimum 23% crude protein), and a contract arrangement with a processor that values the slightly heavier carcass. Ross 308 requires more precise temperature management in week 1. Brooding temperature must stay at 33°C for the first 48 hours without significant drops. In a grid-power-dependent shed without backup, a single 6-hour outage in week 1 will cost you more in poor development than the FCR advantage gains you over the cycle. Ross 308 rewards the well-equipped, experienced operator.

Availability in Zimbabwe

Cobb 500 is available from multiple hatcheries across Zimbabwe and can usually be sourced without a prior contract arrangement. Ross 308 is predominantly available through integrator supply arrangements, which means you often need a contract or relationship in place before day-old chicks become accessible. For a new farmer placing their first batch, Cobb 500 availability is a practical reason to start there before transitioning to Ross 308 with a processor relationship established.

Heat Tolerance

Cobb 500 has moderate heat tolerance. Ross 308 has slightly better adaptation to heat according to performance data, but both breeds suffer meaningfully above 32°C. For Bulawayo, Masvingo, and Lowveld operations facing sustained heat, the Hubbard Classic breed outperforms both Cobb and Ross in hot conditions because it was specifically bred for tropical environments. The heat-tolerance advantage of Ross 308 over Cobb 500 is marginal compared to the Hubbard Classic gap.

FarmIQ Platform

FarmIQ tracks Cobb 500 and Ross 308 benchmarks automatically. Know where your batch stands every day.

This guide is maintained by the FarmIQ team based on real operator data from Zimbabwe farms. Last reviewed: April 2026.