Mekki Ilyes, Smeti Samir, Hajji Hadhami, Mahouachi Mokhtar, Atti Naziha
Animal and Forage Productions Laboratory, University of Carthage, National Institute of Agronomic Research of Tunisia, rue Hédi Karray 2049, Ariana, Tunisia.
Livestock and Wildlife Laboratory, Arid Regions Institute (IRA), University of Gabes, 4119 Médenine, Tunisia.
Arch Anim Breed. 2022 Mar 11;65(1):113-120. doi: 10.5194/aab-65-113-2022. eCollection 2022.
The green oak () plays an important role in forest ecology when oaks are the dominant species or are plentiful. The use of acorns as an alternative to barley for livestock feeding can be beneficial for breeders. The aim of this study was the evaluation of the acorn intake by lambs in two stages, suckling and fattening, on growth, diet digestibility, carcass and non-carcass characteristics. For this, 32 lambs were used. During the suckling period, 16 lambs were reared on range pasture, supplied by barley (S-Ba), the other 16 on forest pasture and supplied by acorns (S-Ac). During the fattening period, lambs were assigned to concentrate based either on barley (F-Ba) or acorn (F-Ac) resulting in eight animals per suckling treatment per fattening treatment. The feed intake, diet digestibility and lamb growth were recorded. At 90 d of fattening, all animals were slaughtered and carcass traits studied. The main results show that the incorporation of acorn in concentrate was without effect on digestibility of organic matter, crud protein and neutral detergent fibre. The nitrogen balance was positive for animals fed barley concentrate or acorn one ( g d ). The lamb growth rates and slaughter body weight were not affected by acorn incorporation in both phases ( ). Consequently, the carcass weights and carcass yields were similar. The F-Ac and S-Ac lambs had relatively heavier liver than F-Ba and S-Ba. The carcass composition in cutting pieces and that in tissues (muscle, fat and bone) was similar for all groups. These results suggest that acorns could replace partially conventional feedstuffs as concentrate without affecting animal performance and carcass quality.
当橡树成为优势树种或数量丰富时，绿橡树（）在森林生态中起着重要作用。用橡子替代大麦作为牲畜饲料对养殖者可能有益。本研究的目的是评估羔羊在哺乳和育肥两个阶段摄入橡子对其生长、日粮消化率、胴体和非胴体特性的影响。为此，使用了32只羔羊。在哺乳期，16只羔羊在山地牧场饲养，由大麦（S-Ba）供应，另外16只在森林牧场饲养，由橡子（S-Ac）供应。在育肥期，羔羊被分配到以大麦（F-Ba）或橡子（F-Ac）为基础的浓缩饲料组，每种哺乳处理在每种育肥处理下有8只动物。记录了采食量、日粮消化率和羔羊生长情况。育肥90天后，所有动物被屠宰并研究胴体性状。主要结果表明，在浓缩饲料中添加橡子对有机物、粗蛋白和中性洗涤纤维的消化率没有影响。饲喂大麦浓缩饲料或橡子浓缩饲料的动物氮平衡为正值（ g·d ）。在两个阶段，添加橡子均未影响羔羊的生长速度和屠宰体重（ ）。因此，胴体重和胴体产率相似。F-Ac和S-Ac组的羔羊肝脏相对比F-Ba和S-Ba组的重。所有组切块的胴体组成以及组织（肌肉、脂肪和骨骼）中的组成相似。这些结果表明，橡子可以部分替代传统饲料作为浓缩饲料，而不影响动物性能和胴体质量。
