The current study was carried out to examine the effect of cottonseed processing and chitosan supplementation on lamb performance, digestibility and nitrogen digestion. Eighty uncastrated Santa Inês lambs (23 ± 2.2 kg average weight, 4 months old) were distributed in a completely randomized design in a 2 × 2 factorial arrangement that consisted of two cottonseed processing forms (whole or ground) and two chitosan levels (0 or 136 mg/kg live weight). Higher dry matter and organic matter apparent digestibility coefficient (ADC) was achieved with the diets containing the whole cottonseed. Ether extract ADC was higher in the animals fed the chitosan-containing diet. There was an interaction effect on the ADC of neutral detergent fibre corrected for ash and protein, which increased with chitosan inclusion associated with the whole cottonseed. The lambs that received the treatment containing the whole cottonseed showed higher microbial protein synthesis. Chitosan addition increased nitrogen retention. The animals fed chitosan-containing diets showed higher microbial protein synthesis. There was an interaction effect on microbial protein synthesis. Whole cottonseed associated with chitosan in lamb diets increases ether extract ADC and microbial protein synthesis.

中文翻译：

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棉籽加工和壳聚糖添加对羔羊性能、消化率和氮消化的影响

目前的研究旨在检验棉籽加工和壳聚糖添加对羔羊生产性能、消化率和氮消化的影响。80 只未去势的 Santa Inês 羔羊（平均体重 23 ± 2.2 公斤，4 个月大）以完全随机设计分布在 2 × 2 因子排列中，其中包括两种棉籽加工形式（整粒或磨碎）和两种壳聚糖水平（0 或136 mg/kg 活重）。含有全棉籽的日粮获得了更高的干物质和有机物质表观消化系数（ADC）。在喂食含壳聚糖饮食的动物中，乙醚提取物 ADC 较高。对灰分和蛋白质进行校正的中性洗涤纤维的 ADC 存在交互作用，其随着与全棉籽相关的壳聚糖夹杂物的增加而增加。接受含全棉籽处理的羔羊表现出更高的微生物蛋白质合成。添加壳聚糖增加了氮的保留。喂食含壳聚糖饮食的动物表现出更高的微生物蛋白质合成。对微生物蛋白质合成存在交互作用。羊肉日粮中与壳聚糖相关的全棉籽可增加醚提取物 ADC 和微生物蛋白质合成。