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- W2079391729 abstract "Data for individual feed intake, liveweight, and egg production were recorded for five genetically different groups of 40 pullets each during 10 test periods of 28-days each. Average ambient temperature at cage level varied from 6.7 C during January to 21.1 C during June. A 2890 kcal/kg metabolizable energy (ME) diet with 16% crude protein (CP) was fed ad lib. Average egg production for the Small Leghorns (SL) was about 60%, for white-egg hybrids (WL) about 75%, for brown-egg hybrids (BL) about 72%, for female line broiler breeders (BB) about 48%, and for broiler-cross pullets (B) about 51%. Average grams liveweight and grams feed intake per hen day were: SL, 1426 and 83.7; WL, 1809 and 104.9; BL, 2610 and 122.9: BB, 4197 and 156.2; and B, 4158 and 167.7. Partition equations which describe the data for SL, WL, BL, and BB, assuming 70% efficiency of use of feed ME for maintenance, tissue formation, and egg formation were: F = (.534 − .004T)W .653 + 2.76ΔW + .80EM and F = (.259 −.00259T)W.75 + 2.76ΔW + .80EM. Similar equations for B, assuming 65% efficiency use of ME, are: F = (.589 − .0044T)W.653 + 2.9ΔW + .85EM and F = (.275 − .00275T)W.75 + 2.9ΔW + .85EM. The terms are: F = grams feed/hen day; T = ambient temperature in °C; W = grams liveweight; ΔW = grams daily change in liveweight; EM = grams egg mass per hen day. Equations which assume 70% efficiency of use of ME are shown to predict feed intake of a diet containing 2890 kcal of apparent ME per kilogram for white and brown-egg layers and broiler-breeder pullets varying in individual body weights from about 1 to 5 kg. Equations, assuming 65% energetic efficiency, describe feed intake for a group of broiler-cross pullets." @default.
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- W2079391729 date "1980-11-01" @default.
- W2079391729 modified "2023-09-27" @default.
- W2079391729 title "Feed Requirements for Egg Production" @default.
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- W2079391729 doi "https://doi.org/10.3382/ps.0592500" @default.
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