A study was conducted in earthen ponds to investigate the effects of available lysine (AL) concentrations in 28 and 32% protein diets on production and processing characteristics, proximate composition, and lysine concentrations in the fillet of channel catfish, Ictalurus punctatus. Diets were formulated to contain 28% protein with 1.22 and 1.43% AL, and 32% protein with 1.43 and 1.63% AL, which were equivalent to 4.37, 5.1, 4.46, and 5.1% AL of protein, respectively. Fingerlings with a mean initial weight of 32 g/fish were stocked into 20 ponds (0.04 ha) at 19,760 fish/ha. Fish were fed once daily to apparent satiation for 181 days. No significant differences were observed for total diet fed, net yield, weight gain, survival, or fillet proximate composition among dietary treatments. However, the 28% protein with low AL diet (1.22% AL of diet or 4.37% AL of protein) resulted in significantly lower carcass and fillet yield and fillet lysine level compared with fish fed the 28% protein diet with 1.43% AL (5.1% AL of protein) and 32% protein diets with 1.43 and 1.63% AL (4.47 and 5.1% AL of protein). Results suggest 1.43% AL of diet is adequate for both 28 and 32% protein diets for optimum growth, processing yield, and lysine retention in fillets for pond‐raised channel catfish.

中文翻译：

---

28和32％蛋白质日粮中可用赖氨酸浓度对池塘养ra鱼Ictalurus punctatus生长，饲料效率，加工产量和鱼片组成的影响

在土池中进行了一项研究，调查了28％和32％蛋白质日粮中可用赖氨酸（AL）浓度对河豚I鱼（Ictalurus punctatus）内圆角的生产和加工特性，邻近成分和赖氨酸浓度的影响。饮食中含有28％的蛋白质和1.22和1.43％的AL，以及32％的蛋白质具有1.43和1.63％的AL，分别相当于4.37、5.1、4.46和5.1％的AL。将平均初重为32克/鱼的鱼种以19,760鱼/公顷的速度放养到20个池塘（0.04公顷）。每天喂鱼一次，使其明显饱食181天。饮食治疗之间的总饮食，净产量，体重增加，存活率或鱼片附近组成没有显着差异。但是，与饲喂28％蛋白质饲料和1.43％AL的鱼相比，低AL饮食的28％蛋白质（饮食的1.22％AL或蛋白质的4.37％AL）导致car体和鱼片产量和鱼片赖氨酸水平显着降低。 ％蛋白质含量的AL）和32％蛋白质饮食中的1.43和1.63％AL（4.47和5.1％AL的蛋白）。结果建议1。