Effects of Early Protein Intake on Development and Subsequent Egg Production of Broiler Breeder Hens

This study examined the influence of crude protein (CP) intake to 6 wk of age on skeletal and body component development of female broiler breeders, as well as subsequent egg production to 33 wk. Chicks were provided isocaloric (2865 kcal ME/kg) feeds containing 12 (low), 16 (medium), or 20% (high) CP in limited allotments intended to result in similar 6-wk body weights (BW). At 6 wk, BW, uniformity, breast weight, and shank and keel lengths were generally increased in proportion to CP intake; conversely, abdominal fat and mortality were decreased. In general, these effects were reduced or nullified by 14 wk and thereafter. Although most physical characteristics were similar among treatments once laying commenced, birds previously provided greater early CP intakes produced more eggs and laid fewer floor eggs to 33 wk.