进行了配对饲养研究,以确定饲喂高卡诺拉粉(CM)日粮的肉鸡的饲料摄入量(FI)降低本身是否导致生长性能降低,以及这种较低的生长速率是否可以通过增加日粮氨基酸(AA)水平来减轻。五种实验性小麦基饮食配方如下:豆粕(SBM)饮食,正常AA浓度的高CM饮食,和高CM饮食,额外的AA浓度为3、6或9%(Lys,Met+Cys,Thr,Ile,Arg,和Val)。另一组鸟类与SBM饮食配对喂养,以达到饲喂正常AA的CM饮食的鸟类的消费水平。在种植者和整理者期间,每次处理有6个重复的17只10天大的Ross308只雄性小鸡。饲喂CM饮食的鸟类降低了FI和BWG,但与随意饲喂SBM的鸟类相比,FCR有所提高(P<0.01)。与CM喂养的鸟类相比,SBM配对喂养的鸟类获得了相同的体重,并表现出相似的FCR。与具有正常AA的SBM和CM饮食相比,额外的9%AA改善了FCR(P<0.01)。DM的回肠消化率无显著差异,能源,粗蛋白,和AA之间的CM与正常AA和SBM饮食。CM日粮中添加6%和9%AA可增加粗蛋白和某些AA的消化率(P<0.05)。随意食用SBM和CM6和9%AA喂养的鸟类腹部脂肪的相对重量最高和最低,分别为(P<0.05)。CM日粮中添加6%和9%AA可提高car体和乳房的相对产量(P<0.01)。随意饲喂SBM的鸟类血清甘油三酯水平较高(P<0.05)。盲肠中微生物群的组成不受治疗的影响。这项研究表明,饲喂高CM饮食的鸟类生长减少主要是通过降低FI来介导的。这种生长抑制可以通过增加饮食AA水平来部分改善。
A pair-feeding
study was conducted to determine if reduced feed intake (FI) in broiler chickens fed high canola meal (CM) diets per se accounts for reduced growth performance and whether this lower growth rate can be mitigated by increasing dietary amino acid (AA) levels. Five experimental wheat-based diets were formulated as follows: soybean meal (SBM) diet, high CM diet with normal AA concentration, and high CM diets with 3, 6, or 9% additional AA concentration (Lys, Met+Cys, Thr, Ile, Arg, and Val). Another group of birds was pair-fed with SBM diet to the consumption levels of birds fed CM diet with normal AA. There were 6 replicates of 17 male 10-day-old Ross 308 chicks per treatment over grower and finisher periods. Birds fed the CM diets had reduced FI and BWG, but improved FCR (P < 0.01) compared to SBM ad libitum fed birds. The SBM pair-fed birds gained the same weight and exhibited similar FCR compared to CM fed birds. Additional 9% AA improved FCR (P < 0.01) compared to SBM and CM diets with normal AA. No significant differences were observed in ileal digestibility of DM, energy, crude protein, and AA between CM with normal AA and SBM diets. The additional 6 and 9% AA in CM diets increased digestibility of crude protein and some AA (P < 0.05). SBM ad libitum and CM + 6 and 9% AA fed birds had the highest and lowest relative weight of abdominal fat, respectively (P < 0.05). Addition of 6 and 9% AA in CM diets increased relative carcass and breast yields (P < 0.01). Serum triglyceride level was higher in SBM ad libitum fed birds (P < 0.05). The composition of microbiota in the ceca was not affected by treatments. This
study showed that reduced growth of birds fed high CM diets is primarily mediated through reduced FI. This growth depression could partially be ameliorated by increasing dietary AA levels.