Arroyo Julien, Molette Caroline, Lavigne Franck, Margetyal Carole, Amador Olivier, Dubois Jean-Pierre, Fortun-Lamothe Laurence
ASSELDOR, Applied Experimental and Demonstration Station on Goose and Duck, La tour de Glane, Coulaures, France.
GenPhySE, University of Toulouse, INRA, INPT, ENVT, Castanet-Tolosan Cedex, France.
Anim Sci J. 2018 Mar;89(3):570-578. doi: 10.1111/asj.12941. Epub 2017 Dec 4.
The aim of this trial was to study the effects of dietary protein content during the rearing period on the performance of mule ducks, according to age at overfeeding (O). Ducks (n = 612) were divided into four groups differing in the protein content in the diet offered during the starting period (S, 0-20 days; S vs. S : 150 vs. 175 g/kg crude protein (CP)) and growing-finishing period (GF; 21-67 or 81 days, depending on age at O; GF vs. GF : 133 vs. 152 g/kg CP). The relative weight of pectoral muscle was lower when ducks were fed a low protein diet during S (-5%, P < 0.01) or GF period (-6%, P < 0.001) at 68 days and higher in ducks of the S GF group (+6%; P < 0.05) at 82 days. Both foie gras and magret weights fell when ducks were fed S or GF (P < 0.05 and < 0.01). Mortality during the O period was higher in ducks fed the S diet and overfed at late age (7.4% vs. 0%; P < 0.01). In conclusion, a reduction in the dietary protein supply should be recommended only during the GF period for ducks overfed at a late age.
本试验旨在根据填饲时的日龄（O），研究育雏期日粮蛋白质含量对骡鸭生产性能的影响。将612只鸭分为四组，起始期（S，0至20日龄；S组与S组：粗蛋白（CP）含量分别为150 g/kg和175 g/kg）和生长育肥期（GF；21至67或81日龄，取决于填饲时的日龄；GF组与GF组：CP含量分别为133 g/kg和152 g/kg）的日粮蛋白质含量不同。68日龄时，在S期（-5%，P<0.01）或GF期（-6%，P<0.001）饲喂低蛋白日粮的鸭胸肌相对重量较低，而在82日龄时，S GF组的鸭胸肌相对重量较高（+6%；P<0.05）。填饲S或GF日粮时，鸭的肥肝和胸肉重量均下降（P<0.05和<0.01）。在O期，饲喂S日粮且后期填饲的鸭死亡率较高（7.4%对0%；P<0.01）。总之，对于后期填饲的鸭，仅建议在GF期减少日粮蛋白质供应。
