Centro de Investigación y Tecnología Agroalimentaria de Aragón (CITA), Instituto Agroalimentario de Aragón-IA2 (CITA-Universidad de Zaragoza), Zaragoza, Spain.
J Sci Food Agric. 2019 Jan 15;99(1):457-463. doi: 10.1002/jsfa.9207. Epub 2018 Aug 16.
The interest for grazing systems and the use of condensed tannins (CTs) as sources of natural antioxidants in animal diets has been increasing in recent years. The objective was to study the animal performance and carcass quality of the lambs according to the feeding strategy during lactation (indoors, grazing alfalfa, grazing sainfoin) and the inclusion of quebracho as a source of CTs (50 g kg ) in the fattening concentrate.
The feeding strategy during lactation only had effects on carcass quality. Indoor lambs had a greater dressing percentage and deposition of kidney fat than sainfoin and alfalfa lambs. The kidney fat of sainfoin- and alfalfa-fed lambs had a greater yellowness, chroma and carotenoid content than the fat of indoor-fed lambs (P < 0.05), whereas the subcutaneous fat colour was not affected by the feeding during lactation. The use of fat colour to trace the feeding strategy was assessed and found insufficiently accurate to implement its use. The inclusion of 50 g kg quebracho in the concentrate fed during the fattening period increased lamb weight gains and feed intake but had little effect on the carcass characteristics.
The feeding strategies during lactation had an effect on the carcass characteristics, highlighting the importance of the dam's diet during this period. The inclusion of quebracho in the lamb's concentrate had minor effects. © 2018 Society of Chemical Industry.
近年来，人们对放牧系统和利用单宁（CT）作为动物日粮天然抗氧化剂的兴趣日益增加。本研究旨在根据哺乳期（室内、放牧紫花苜蓿、放牧三叶草）的饲养策略以及在育肥浓缩饲料中添加奎那酸（CT）来源的五倍子（50 g kg-1）来研究羔羊的动物生产性能和胴体质量。
哺乳期的饲养策略仅对胴体质量有影响。室内饲养的羔羊比三叶草和紫花苜蓿羔羊的屠宰率和肾脏脂肪沉积更高。与室内饲养的羔羊相比，三叶草和紫花苜蓿羔羊的肾脏脂肪的黄度、色值和类胡萝卜素含量更高（P<0.05），而皮下脂肪的颜色不受哺乳期饲养策略的影响。对使用脂肪颜色来追踪饲养策略进行了评估，发现其不够准确，无法实施。在育肥期间在浓缩饲料中添加 50 g kg-1 的五倍子提高了羔羊的体重增加和采食量，但对胴体特性影响不大。
哺乳期的饲养策略对胴体特性有影响，突出了母羊在这一时期饮食的重要性。在羔羊的浓缩饲料中添加五倍子的效果较小。© 2018 英国化学学会。
