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  • Title: Productivity, reproductive performance, and fat deposition of laying duck breeders in response to concentrations of dietary energy and protein.
    Author: Xia WG, Abouelezz KFM, Fouad AM, Chen W, Ruan D, Wang S, Azzam MMM, Luo X, Fan QL, Zhang YN, Zheng CT.
    Journal: Poult Sci; 2019 Sep 01; 98(9):3729-3738. PubMed ID: 30815684.
    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 (P < 0.05). The hepatic transcript abundances of genes for very low density apolipoprotein-II and carnitine palmitoyltransferase-1A (CPT-1A) were lowest in birds fed MCP, whereas the highest abundance of CPT-1A transcripts was found in birds fed MME. These results revealed that the diets containing ME of 12.9 kcal/g protein optimized both egg production and egg mass, while the feed conversion was optimized at 12.8 kcal ME/g protein. Using ME to CP ratio of 12.9 kcal/g protein, i.e., 2,451 kcal ME/kg at 19% CP, maximized the reproductive performance and hatchling outcome of Longyan laying duck breeders.
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