Backyard Poultry

Six Milestones of Chicken Growth Stages

Starting a Flock : Chick Nutrition

Flock Management : Layer Nutrition

Patrick Biggs, Ph.D.

Nutritionist, Companion Animal Technical Solutions

As you get started on the journey of raising backyard chickens, it’s fun to look forward to the milestones you will celebrate with your flock. From baby chick to retirement, there are six important chicken growth stages. Each stage signals nutrition changes for your flock’s complete chicken feed.
Graduating school. Getting married. Having children. Retirement. We celebrate many milestones in life. 
Key moments also happen for backyard chickens. While your flock won’t be buying their first new car any time soon, each bird will also go through important growth stages.

We recommend using these six chicken growth milestones as a roadmap to creating a complete feeding program:

1. Weeks 1-4: Baby chicks
Graphic showing pathway of chicken growth stages, including: Baby chicks, teenage chickens, laying eggs, molting chickens and laying hen retirement.

Start your birds strong by providing a complete starter-grower feed with at least 18 percent protein to support chick growth. The feed should also include amino acids for chick development, prebiotics and probiotics for immune health, and vitamins and minerals to support bone health.
Chicks are also susceptible to illness. If chicks were not vaccinated for coccidiosis by the hatchery, choose a medicated chick starter feed. Medicated feeds like Purina® Start & Grow® Medicated, are not impacted by the Veterinary Feed Directive and can be purchased without a veterinarian.

2. Weeks 5-15: The teenage chicken stage

During weeks 5 and 6, chicks will go through visible growth changes, including new primary feathers and a developing pecking order. Growing birds are now referred to differently. Pullet is the term for a teenage female, while a young male is called a cockerel. Between weeks 7 and 15, the physical differences between genders will become even more obvious.
Continue to feed a complete starter-grower feed, like Purina® Organic Starter-Grower, Purina® Start & Grow® Medicated or Purina® Start & Grow® Non-Medicated, during the teenage stage. Along with 18 percent protein, make sure the feed contains no more than 1.25 percent calcium. Too much calcium can have a detrimental effect on growth, but a complete starter feed has just the right balance for growing birds.

3. Weeks 16-17: When to switch from chick starter to layer feed

Around weeks 16-17, people begin to check their nesting boxes for the coveted first egg. At this point, consider layer feed options so you can make a smooth transition.
As compared to starter-grower, a layer chicken feed has less protein and more calcium. This added calcium is important for egg production.
Look for a chicken layer feed that matches your flock goals – whether that’s Purina® Organic Layer Pellets or CrumblesPurina® Layena® Omega-3,  Purina® Layena® PelletsPurina® Layena® Crumbles or Purina® Layena High Protein®. In any case, be sure the layer feed is made with simple, wholesome ingredients and includes 16 percent protein, at least 3.25 percent calcium as well as key vitamins and minerals.

4. Week 18: At what age do chickens start laying eggs?

When birds reach 18 weeks old or when the first egg arrives, slowly transition to a layer feed. Make the transition gradually to prevent digestive upset.
On our farm, we have found it’s best to transition over time rather than all at once. We mix the starter and layer feed evenly for four or five days. If birds are used to crumbles, start with a crumble layer feed. The same goes with pellets. The more similar the two feeds are, the smoother the transition will go.

5. Month 18: Molting chickens

Once the first egg has been laid, it’s business as usual for a while. Around 18 months, feathers will likely begin to cover the coop floor. Welcome to the season of molting chickens!
The first molt usually occurs in the fall when days become shorter. Your flock will take a break from egg laying and shed feathers for a few weeks. This is a completely natural annual occurrence.
Protein is the key nutrient in a flock’s diet to keep them strong during molt. This is because feathers are made of 80-85 percent protein, whereas eggshells are primarily calcium.

When molt begins, switch to a complete feed with 20 percent protein like Purina® Flock Raiser®. A high-protein complete feed can help hens channel nutrients into feather regrowth. Once birds begin producing eggs again, switch back to a layer feed to match their energy needs.

6. Laying hen retirement

One day, the time may come for the veterans of a flock to take a vacation and retire from egg-laying. Although a laying hen will stop laying as she ages, she still has an important place in the flock as a steady companion who brings joy to the entire family.
At this point, transition back full circle to a higher-protein feed, such as Purina® Flock Raiser®. If you have laying hens in the flock, supplement with oyster shell to assist their egg production.
Ready to start your journey? Visit our Baby Chick Resource Center for everything you need to start chicks strong.