Ross 308 / Ross 308 AP
The Ross 308 AP is a premium-performance commercial broiler genotype bred by Aviagen Group to deliver balanced performance, combining a high-yielding, feed-efficient broiler with a highly productive breeder. Developed in the United Kingdom and United States, the Ross 308 standard was first introduced in the early 2000s, with the AP (Aviagen Performance) variant gaining prominence in India in the 2010s. In India, it is the primary alternative to the dominant Vencobb lines.
Practical Overview & Field Action
Field Verification Checkpoints
- FCR Benchmarks: 1.43 at 35 days / 1.56 at 42 days (2021/2022 manuals)
Breed Characteristics
Economic Importance
The Ross 308 AP holds approximately 15%–20% of the Indian broiler market and is utilized by independent integrators like Suguna Foods, IB Group, and Sneha Farms. It is most prevalent in Southern India (Tamil Nadu, Karnataka) and Central/Eastern India. Its outstanding breast meat yield (≥25%) makes it highly profitable for processing operations and the growing processed poultry segment.
Overview
The Ross 308 AP is a premium-performance commercial broiler genotype bred by Aviagen Group to deliver balanced performance, combining a high-yielding, feed-efficient broiler with a highly productive breeder. Developed in the United Kingdom and United States, the Ross 308 standard was first introduced in the early 2000s, with the AP variant gaining prominence in India in the 2010s. The latest genetic version is the Ross 308 AP (2022 Performance Goals). It competes directly with Vencobb 400Y and Hubbard Efficiency Plus.
Origin
Developed by Aviagen Group in the United Kingdom and United States. Alternate names include Ross, Ross AP, and Ross 308. The AP variant was specifically designed for markets with challenging environmental conditions like Latin America and parts of Asia, incorporating a larger skeletal frame and robust metabolic features compared to the standard European Ross 308.
Production Performance
| Performance Parameter | Ross 308 AP (2021/2022 Manuals) | Ross 308 AP (2019 Goals) | Comparative Research Trials |
|---|---|---|---|
| Market Age (Days) | 35–42 | 35–42 | 35–42 |
| Weight at 35 Days | 2.282 kg | 2.298 kg | 2.150–2.250 kg |
| Weight at 42 Days | 2.995 kg | 3.006 kg | 2.800–2.950 kg |
| FCR at 35 Days | 1.43 | 1.46 | 1.48–1.53 |
| FCR at 42 Days | 1.56 | 1.59 | 1.58–1.65 |
| Livability Percentage | ≥96.5% | ≥96.0% | 94.5%–97.0% |
| Carcass Yield | 72.0%–74.0% | 72.0%–74.0% | 71.5%–73.8% |
| Breast Meat Yield | 25.0%–26.5% | 24.5%–26.0% | 23.8%–25.5% |
Key Characteristics
- Growth Rate: Outstanding — highest growth rates among compared commercial broilers
- Breast Meat Yield: 25.0%–26.5% — highly profitable for processing operations
- Leg Strength: Strong — genetically selected for skeletal integrity to support heavy breast conformation
- Heat Tolerance: Low — more sensitive to heat stress and hot, humid tropical climates compared to Vencobb 400Y
Management Requirements
- Housing: Climate-controlled housing where ambient temperature from 21 days onward can be maintained below 21°C
- Stocking Density: 1.15–1.30 sq. ft. per bird depending on ventilation efficiency
- Brooding: Rapid access to water and feed at placement to achieve target crop fill of >75% within 2 hours and >95% by 24 hours
- Humidity: Minimum 50% RH during first week to prevent respiratory issues
- Feed Program: 3-stage feed program with controlled digestible lysine (0.51% in grower phase) to promote fat reserve deposition and control fleshing; feed clean-up times minimum target of 40 minutes; specialized feeding schedules (5×2 or 4×3 programs) if clean-up time is not achieved
Health Considerations
- Highly robust, though rapid growth and high feed intake make it sensitive to metabolic stresses, heat stress, and respiratory challenges in humid tropical climates
- Leg strength is excellent — genetically selected for skeletal integrity
- Poor brooding or low humidity (<50% RH) during first week can increase susceptibility to respiratory issues and reduce 7-day weight targets
Economic Importance
At the parent stock level: depletion age 448 days (64 weeks), 181.8 total eggs per HHA, 174.9 hatching eggs per HHA, 148.8 chicks housed per female, 85.1% hatchability. Rearing feed approximately 32.2 kg per 100 hatching eggs and 37.8 kg per 100 chicks produced. At the commercial level, its low FCR makes it highly competitive, especially where feed ingredient costs are volatile.
Advantages
- Outstanding growth rates and low FCR, particularly in EC housing
- High breast meat yield (≥25%), making it highly profitable for processing operations
- Highly productive and cost-effective parent stock
- Strong genetic selection for skeletal health and leg integrity
Limitations
- Strong appetite requires strict dietary and feeding management during rearing to prevent overweight parent stock
- Higher sensitivity to heat stress and hot, humid tropical climates compared to Vencobb 400Y
- Demands high-quality, balanced diets with precise amino acid profiles to achieve full genetic potential
Best Suitable Farming Systems
- Climate-controlled EC housing
- Large integrated operations in Southern India (Tamil Nadu, Karnataka) and Central/Eastern India
- Processing operations requiring high breast meat yield
References
- Ross 308 AP Broiler Performance Objectives — Aviagen Group, 2022, Aviagen Tech Center
- Ross 308 AP Parent Stock Performance Objectives — Aviagen Group, 2021, Aviagen Tech Center
- Ross 308 AP Parent Stock Nutrition Specifications — Aviagen Group, 2021, Aviagen Tech Center
Review official commercial growth, feed intake, and FCR efficiency trajectories for Cobb 500, Ross 308, and VenCobb 430 with governed biophysical comparability.
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