Abstract
This study evaluated the optimal concentrations of dietary ME and CP for the productivity, reproductive performance, and fat deposition in laying duck breeders aged from 29 to 45 wk. Using a 3 × 3 factorial arrangement of treatments, 648 Longyan laying duck breeders with similar BW were randomly assigned to experimental diets of 2,600 (HME = high ME), 2,500 (MME = medium ME), or 2,400 (LME = low ME) kcal of ME/kg, each containing 19% (HCP = high CP), 18% (MCP = medium CP), or 17% (LCP = low CP) CP. Each dietary treatment contained 6 replicates of 12 birds each. Compared with birds fed the LCP diet, the egg production and egg mass were higher in birds fed HCP and MCP (P < 0.01), with better feed conversion (P < 0.01). Interactions were detected between ME and CP levels in egg production, egg mass, and feed conversion ratio as the LMEMCP diet was the best (P < 0.05). The birds fed MME (P < 0.05) had the lowest abdominal fat. The percentage of healthy ducklings was affected by maternal dietary CP (P < 0.05) with the HCP being the highest. The weight of large yellow follicles/ovarian weight was higher in birds fed HCP and MCP (P < 0.05), whereas the weight of small yellow follicles/ovarian weight was higher in birds fed HCP and LCP...Continue Reading
References
Jan 1, 1991·Poultry Science·A Peguri, C Coon
Apr 1, 1987·Poultry Science·R S Spratt, S Leeson
Jan 1, 1982·British Poultry Science·R A Pearson, K M Herron
Jul 1, 1994·Virology·S J MadoreB R Cullen
Nov 24, 1999·Poultry Science·S GrobasG G Mateos
Mar 24, 2006·Poultry Science·A CorzoM T Kidd
May 22, 2008·Poultry Science·H P FanW Huang
Mar 24, 2012·Animal : an International Journal of Animal Bioscience·J ChenS Zou
Apr 11, 2013·Poultry Science·G R Murugesan, M E Persia
Jul 23, 2014·Asian-Australasian Journal of Animal Sciences·R R AlvarengaV M P Bernardino
Aug 2, 2014·Asian-Australasian Journal of Animal Sciences·R L LinJ P Poivey
Sep 7, 2014·Poultry Science·T G V MoraesM J Zuidhof
Oct 16, 2015·Poultry Science·D RuanC T Zheng
Oct 16, 2015·Poultry Science·W G XiaC T Zheng
Jul 30, 2016·Poultry Science·Weiguang XiaChuntian Zheng
May 4, 2017·Biomedical Papers of the Medical Faculty of the University Palacký, Olomouc, Czechoslovakia·Radovan UvizlKaterina Langova