Mohammed Khaled Abouelezz Fouad, Sarmiento-Franco Luis, Santos-Ricalde Ronald, Solorio-Sanchez Javier Francisco
Department of Animal Nutrition, Faculty of Veterinary Medicine and Animal Science, University of Yucatan (UADY), Mérida, Yucatán, Mexico.
Trop Anim Health Prod. 2013 Feb;45(2):367-72. doi: 10.1007/s11250-012-0225-y. Epub 2012 Jul 22.
The aim of this experiment was to study the suitability of the outdoor system for Rhode Island Red hens under the tropical conditions of southern Mexico. Twelve floor pens, each containing four birds, were divided randomly into two groups. The first group was raised indoors only, while each of the second group replicates had access to an outdoor area with natural-grown vegetation from 0800 to 1700 hours daily. Both groups fed ad libitum on a commercial layers diet. The results revealed no differences in body weight between treatments. The outdoor group recorded significantly higher egg laying rate (86.90 vs. 78.05 %), higher egg mass (50.66 vs. 45.30 g egg/hen/day), and higher feed intake (103.70 vs. 97.67 g/day) versus the indoor group. The outdoor group had eggs with darker yellow yolks (9.46 vs. 5.46), lower yolk, and higher albumen proportions (P < 0.05) versus the indoor group. The crop content of the outdoor hens consisted of 86.55 % concentrated feed, 6.30 % plant material, 2.27 % grit stones, 1.69 % snails and oyster shells, 1.25 % seeds, 0.95 % farm wastes, and 0.99 % insects, worms, and larvae. Of the outdoor hens, 43.1 % was observed to be in the range at each scanning time. The outdoor system in the tropics had beneficial effects on Rhode Island Red hen performance, and the hens utilized the outdoor area effectively and obtained various feed items.
本实验的目的是研究在墨西哥南部热带条件下室外系统对罗德岛红母鸡的适用性。十二个地面鸡舍，每个鸡舍容纳四只鸡，被随机分为两组。第一组仅在室内饲养，而第二组的每个重复鸡舍每天08:00至17:00可进入有自然生长植被的室外区域。两组均自由采食商业蛋鸡日粮。结果显示，各处理间体重无差异。与室内组相比，室外组的产蛋率显著更高（86.90%对78.05%）、蛋重更高（50.66对45.30克蛋/只/天）且采食量更高（103.70对97.67克/天）。与室内组相比，室外组的蛋黄颜色更深（9.46对5.46）、蛋黄比例更低且蛋白比例更高（P<0.05）。室外母鸡的嗉囊内容物包括86.55%的浓缩饲料、6.30%的植物性物质、2.27%的砂砾、1.69%的蜗牛和牡蛎壳、1.25%的种子、0.95%的农场废弃物以及0.99%的昆虫、蠕虫和幼虫。在每次扫描时，观察到43.1%的室外母鸡处于该范围内。热带地区的室外系统对罗德岛红母鸡的生产性能有有益影响，母鸡能有效利用室外区域并获取各种饲料。
