Universidad Nacional Agraria La Molina, Av. La Molina S/N, La Molina, Lima, Perú.
Instituto Nacional de Innovación Agraria, Av. La Molina N°1981, La Molina, Lima, Perú.
Trop Anim Health Prod. 2024 Oct 1;56(8):311. doi: 10.1007/s11250-024-04177-7.
The aim of this study was to evaluated the impact of different fibre levels in alpaca diet on voluntary feed intake and apparent digestibility, and to estimate the digestibility of organic matter (OMD) from the content of crude protein (CP) in feces. The study was carried out with twelve alpacas (36.7 ± 6.4 kg body weight- BW), which were offered 4 treatments with different neutral detergent fiber content (NDF. T1: 40.3%; T2: 62%; T3: 68%; T4: 72%) under a switch back design. Absolute daily dry matter intake (DMI) was higher for T1 (678 g/d) than T4 (312 g/d) (p ≥ 005). NDF intake was similar between treatments when related to BW or MW (on average 1% BW and 22 g/kg MW. p ≥ 0.05). Water intake (L/kg DMI) was higher in T1 compared to the other treatments, with values ranging from 2.9 L/kg DMI(T1) to 2.8 L/kg DMI(T4), respectively (p ≤ 0.05). Digestibility of dry matter, organic matter and CP was higher in T1 than in the other treatments, with average values ranging from 72% for T1 to 32% for T4 (p ≤ 0.05). NDF digestibility was similar among treatments (p ≥ 0.05). The regression equation generated to predict OMD (y) was as follows: y = 0.360 + 0.08294*fecal CP (g/kg OM). Further studies will indicate whether faecal nitrogen can be used to estimate digestibility and hence diet quality in South American camelids.
本研究旨在评估不同纤维水平的 alpaca 日粮对自由采食量和表观消化率的影响，并通过粪便中粗蛋白（CP）含量估计有机物（OMD）的消化率。该研究使用 12 只 alpaca（36.7±6.4kg 体重-BW）进行，采用 4 种不同中性洗涤剂纤维含量（NDF）的处理（T1：40.3%；T2：62%；T3：68%；T4：72%），采用反转设计。T1（678 g/d）的绝对日干物质摄入量（DMI）高于 T4（312 g/d）（p≥005）。当与 BW 或 MW 相关时，NDF 摄入量在处理之间相似（平均 1% BW 和 22 g/kg MW，p≥0.05）。与其他处理相比，T1 的水摄入量（L/kg DMI）较高，范围从 2.9 L/kg DMI（T1）到 2.8 L/kg DMI（T4）（p≤0.05）。T1 的干物质、有机物和 CP 消化率高于其他处理，平均范围从 T1 的 72%到 T4 的 32%（p≤0.05）。NDF 消化率在处理之间相似（p≥0.05）。生成的预测 OMD（y）的回归方程如下：y=0.360+0.08294*粪便 CP（g/kg OM）。进一步的研究将表明粪便氮是否可用于估计南美驼科动物的消化率和因此日粮质量。
