Journal
JOURNAL OF APPLIED POULTRY RESEARCH
Volume 14, Issue 4, Pages 728-739Publisher
OXFORD UNIV PRESS
DOI: 10.1093/japr/14.4.728
Keywords
body weight; broiler breeder; hatching egg production; egg weight; dietary fat; body composition; feed withdrawal rate
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This research was conducted to determine how different dietary and management systems might benefit hatching egg production for flocks with pullets having different BW. The heavy BW pullets produced 3 more eggs than the light BW group before peak because the heavy BW breeder group produced the first egg and reached 50% production 4 to 5 d earlier. However, the light BW breeders produced an equal number of eggs and gained more weight with a higher percentage of carcass crude protein compared with the heavy and medium BW breeders during the experimental period from 20 to 65 wk of age. Feeding high-fat diets to all BW groups of breeders during the 20- to 65-wk period resulted in more weight gain, larger eggs, and 2.5% more carcass fat than feeding low-fat diets, although the breeders were fed equal calories and amino acids each day. Breeders provided a weekly slow feed withdrawal program after peak production with feed being reduced by 0.16 g/d per breeder gained more weight and produced heavier eggs from 30 to 65 wk of age compared with breeders on a faster feed withdrawal program. The breeders provided the faster feed withdrawal program had feed reduced by 0.64 g/d per breeder for wk 1, 0.33 g/d per breeder for wk 2 and 3, and 0.16 g/d per breeder thereafter. The feed withdrawal programs were stopped when breeders were fed 396 kcal of ME/d per hen. The breeder hens that had feed reduced at a faster rate consumed 5.7 g less feed per egg.
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