Day 14 is the definitive benchmark concluding Stage 2 (Brooding Exit & Early Growth). By today, broilers must have quadrupled their Day 7 weight and multiplied their hatch weight by over 11 times. Farm managers conduct a thorough performance audit reviewing cumulative mortality, feed conversion, uniformity (>85%), and gut health to clear the flock for Stage 3 rapid grower phase.
The 14-day body weight correlates directly with final 42-day harvest weight (every 10g deficit at Day 14 results in 50–70g deficit at market age). Passing this milestone with dry litter, healthy lungs, and robust skeletal frames guarantees maximum feed efficiency in the fast-growing finisher weeks.
•Switching abruptly from Starter Crumble to coarse Grower Pellets without a 2-day blending transition.
•Keeping house temperature too warm (>27°C), depressing bird appetite and slowing 14-day growth.
•Failing to document 14-day KPIs, losing the ability to diagnose feed conversion discrepancies later.
•Day 14 is the common window for the intermediate or intermediate-plus Gumboro (IBD) vaccine booster depending on maternal antibody decay curves. Ensure birds are healthy and free from immunosuppression before administering live vaccines.
•Veterinary Escalation Threshold: If 14-day mortality exceeds 0.25% daily or if post-mortem reveals bursal atrophy, enlarged spleen, or proventriculitis, consult your veterinary specialist immediately before administering any scheduled vaccinations.
•Celebrate the 14-day milestone by thoroughly reviewing your performance sheet. A flock that reaches 500g at Day 14 with good uniformity is 80% on track for a record harvest weight at Day 42.
•Prepare for the grower feed transition by mixing 75% Starter Crumble with 25% Grower Pellets over the next 24 hours to accustom birds to the larger particle size without causing digestive stalling.
Target weight is 450g to 550g (breed standard target: 500g for Ross 308 / Cobb 500). Achieving 500g at Day 14 is the strongest predictor of achieving >2.5 kg at Day 42.
An optimal cumulative FCR at Day 14 is between 1.18 and 1.25. An FCR above 1.30 signals feed spillage, cold stress, or subclinical gut enteritis.
Transition smoothly over 2 to 3 days: Day 14–15 use a 70:30 blend of Starter Crumble to Grower Pellet, moving to 30:70 on Day 16, and 100% Grower Pellet by Day 17.
