In Sicily, the current increasing cultivation of Opuntia ficus-indica corresponds to an availability of prickly pear by-product (PPB) that results from fruit processing for juice extraction. This investigation aims to evaluate the nutritional traits of PPB for ruminant feeding and its stability during a 21-day outdoor storage, using potassium metabisulfite (PMB) as a preservative agent, added to the PPB mass at different doses (0, 50, 100, and 150 g/kg). The fractioning of PPB showed that it included 28% of peel and pulp and 72% of seeds on a dry matter (DM) basis. On the whole, this by-product was low in crude protein (5.32% DM), high in fiber content (51.38%, 41.15% and 14.64% DM for NDFom, ADFom and ADL respectively), non-fiber carbohydrates (NFC, 29.68% DM), and soluble sugars (13.3% DM), with a moderate level of net energy for lactation (4.59 MJ/kg DM). Storage was the main factor of alteration of PPB chemical composition with the exception of ether extract. A decline of NFC and soluble sugars, due to microbial fermentation, was observed with all PMB treatments, especially during the first week of storage, probably due to evolution of both coccus (M17) and rod LAB (MRS), which increased their loads at the seventh day of storage.

中文翻译：

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家畜反刍动物饲料中的花梨副产物：初步调查。

在西西里岛，目前正在增加的仙人掌印度仙人掌种植对应于因果汁加工而提取果汁而获得的花椒副产物（PPB）的可用性。这项研究旨在评估使用反亚硫酸氢钾（PMB）作为防腐剂，以不同剂量（0、50、100，和150克/公斤）。PPB的分馏显示，基于干物质（DM），PPB包括28％的果皮和果肉和72％的种子。总体而言，该副产品的粗蛋白含量低（5.32％DM），纤维含量高（NDFom，ADFom和ADL分别为51.38％，41.15％和14.64％DM），非纤维碳水化合物（NFC，29.68） DM）和可溶性糖（13.3％DM），具有适度的泌乳净能量（4.59 MJ / kg DM）。除乙醚提取物外，储存是改变PPB化学组成的主要因素。在所有PMB处理中，尤其是在存储的第一周，由于微生物发酵，观察到NFC和可溶性糖的减少，这可能是由于球菌（M17）和棒形LAB（MRS）的进化，这增加了它们的负荷。储存的第七天。