Energy metabolism in laying hens of different body weight‐genotypes
作者:
Monika Klein,
Marlies Neubert,
E. Strobel,
L. Hoffmann,
期刊:
Archiv für Tierernaehrung
(Taylor Available online 1998)
卷期:
Volume 51,
issue 4
页码: 263-277
ISSN:0003-942X
年代: 1998
DOI:10.1080/17450399809381925
出版商: Taylor & Francis Group
关键词: Energy metabolism;Energy maintenance requirement;Dwarf‐gene;Laying hen
数据来源: Taylor
摘要:
Energy metabolism and some performance parameters were investigated in laying hens of 3 different body weight‐genotypes: 6×7 (normal‐sized, crossbred from normal‐sized male and female lines, group 1), 47 x 38 (dwarf‐sized, breeding from a dwarf‐sized male line and a normal‐sized female line, group 2) and 44×47 (dwarf‐sized, breeding from dwarf‐sized male and female lines, group 3). Energy balance was measured by indirect calorimetry through C‐and N‐balances in 12 animals of each group during 10 consecutive days at production peak, within the period between the 27th and the 37th week of age. Hens were caged individually at 23°C environmental temperature and fedad libitumon a laying mash. The mean body weight in the dwarf‐sized groups 2 and 3 was 32% lower than in the normal‐sized group 1 during the energy balance period. The daily gross energy intake in group 2 and 3 was decreased by 33 and 34%, respectively. There were no significant differences in digestibility and metabolizability of gross energy between the groups. The energy requirements for maintenance [kJ ME/kg0.75d] derived from the energy balances were lower by 4% (P>0.05) and 14% (P<0.05) in the dwarf‐sized groups 2 and 3 as compared with the normal‐sized group 1, when equal coefficients of partial efficiency of metabolizable energy utilization for energy retention in body and eggs are assumed for the 3 body‐mass genotypes. There were no relevant differences in body composition at the end of the energy balance periods as well as in egg composition between the 3 experimental groups.
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