Maximizing Dairy Heifer Success: Key Strategies for Optimal Calf Rearing in the First 100 Days

The Importance of the First 100 Days for Dairy Heifers

The first 100 days for dairy heifers are crucial for their future in dairying. This was highlighted during a farm walk at Richard Brown’s farm in Millisle, Co. Down.

Impact of Early Life on Heifer Growth

The initial weeks of a calf’s life significantly influence heifer growth targets and the overall profitability of a dairy business. Calves must receive enough high-quality colostrum within the first three hours after birth to give them the best start.

As calves transition from colostrum to milk powder, it’s vital to monitor their diet closely to ensure healthy growth rates.

Key Heifer Targets

CAFRE dairy advisers, Conail Keown and Anna Truesdale, alongside Trouw Nutrition’s calf nutrition expert, Aaron Brown, shared insights on growth targets and effective nutrition during this critical phase.

Aaron focuses on his herd of 70 Holstein replacement heifers, aiming to achieve specific weight targets based on a birth weight of 40 kg and a mature weight of 685 kg:

• One Month: 55 kg
• Post Wean (Three Months): 116 kg
• Pre-Breeding (13/14 Months): 377 kg
• Pre-Calving (24 Months): 582 kg
• Mature Weight: 685 kg

To ensure calves receive adequate nutrition, Aaron implements a strict colostrum protocol, ensuring each calf consumes at least 10% of its body weight shortly after birth.

Calf Rearing Practices

Calf milk replacer is provided through an automatic feeder in a well-ventilated shed with fresh bedding. Calves have access to fresh water and ad libitum dry feed, with chopped straw being the preferred forage due to its low energy density. This encourages simultaneous intake of starter concentrates and supports healthy rumen development.

As calves grow to five or six weeks old, milk feeding levels decrease gradually. This method helps boost starter feed intake and reduces stress during weaning.

Calves should be fully weaned by 10-12 weeks, having consumed a total of 35 kg of dry matter from starter feed. Aaron emphasizes checking starter intake before reducing milk, ensuring calves receive enough energy from concentrate feed.

Assessing Calf Rearing Conditions

Farmers should evaluate their calf rearing practices with questions including:

• Is the environment suitable?
• Is humidity low in the shed?
• Is bedding clean and fresh?
• Is there good ventilation without drafts?
• Is clean water available?

Keeping water available is critical for calf health and growth during the early weeks.

Aaron notes that improper concentrations can lead to gut issues in developing calves.

Managing Growth Post-Weaning

A careful weaning process is imperative. Stress during weaning can delay growth at a crucial time for feed conversion and growth rates.

Farmers must meet weight targets and consistently measure progress to manage their calf rearing effectively. This approach will help ensure better performance on the farm.