Department of Animal Production and Food Science, Faculty of Veterinary Science, University of Zaragoza, Spain.
Group of Animal Welfare and Sustainable Production, Department of Food Science, Metropolitan Autonomous University, UAM-Lerma, State of Mexico, Mexico.
Meat Sci. 2014 May;97(1):42-8. doi: 10.1016/j.meatsci.2014.01.001. Epub 2014 Jan 15.
This study analyses the effect of environmental enrichment on the welfare, productive traits and meat quality of lambs housed in feedlots. Sixty lambs were placed in enriched (EE) or conventional (CO) pens (3 pens for each treatment, 10 lambs/pen) where EE had a wooden platform with ramps that provided access to a concentrate hopper, cereal straw as bedding and forage, and one play ramp. The CO pen was barren, similar to commercial feedlots. The physiological adaptation response of EE lambs was more efficient than CO, since the latter mobilised more body reserves (i.e., increased NEFA, P<0.05), and had lower levels of immunity (i.e., increased N/L, P<0.05), which indicate chronic stress, probably associated with the barren environment. The EE lambs had a higher (P<0.05) average daily gain, with heavier carcasses and higher fattening scores, as well as lower pHult, higher L and b values, and lower values of texture (P<0.05).
本研究分析了环境丰容对饲养在饲料场内的羔羊福利、生产性能和肉质的影响。60 只羔羊被安置在丰容（EE）或传统（CO）围栏中（每个处理 3 个围栏，每个围栏 10 只羔羊），其中 EE 有一个带有斜坡的木制平台，可通往浓缩料斗、谷物秸秆作为寝具和饲料，以及一个游乐斜坡。CO 围栏是贫瘠的，类似于商业饲料场。EE 羔羊的生理适应反应比 CO 更有效，因为后者动员了更多的身体储备（即增加了 NEFA，P<0.05），并且免疫力更低（即增加了 N/L，P<0.05），这表明存在慢性应激，可能与贫瘠的环境有关。EE 羔羊的平均日增重更高（P<0.05），胴体更重，育肥评分更高，pHult 值更低，L 和 b 值更高，质地值更低（P<0.05）。
