Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, China.
Inner Mongolia Academy of Agricultural and Animal Husbandry Sciences, Hohhot, China.
PeerJ. 2024 May 30;12:e17453. doi: 10.7717/peerj.17453. eCollection 2024.
Sown mixed grassland is rarely used for livestock raising and grazing; however, different forages can provide various nutrients for livestock, which may be beneficial to animal health and welfare. We established a sown mixed grassland and adopted a rotational grazing system, monitored the changes in aboveground biomass and sheep weights during the summer grazing period, measured the nutrients of forage by near-infrared spectroscopy, tested the contents of medium- and long-chain fatty acids by gas chromatography, and explored an efficient sheep fattening system that is suitable for agro-pastoral interlacing areas. The results showed that the maximum forage supply in a single grazing paddock was 4.6 kg DM/d, the highest dry matter intake (DMI) was 1.80 kg DM/ewe/d, the average daily weight gain (ADG) was 193.3 g, the DMI and ADG were significantly correlated ( < 0.05), and the average feed weight gain ratio (F/G) reached 8.02. The average crude protein and metabolizable energy intake by sheep were 286 g/ewe/d and 18.5 MJ/ewe/d respectively, and the n-6/n-3 ratio of polyunsaturated fatty acids in mutton was 2.84. The results indicated that the sheep fattening system had high feed conversion efficiency, could improve the yield and quality of sheep, and could be promoted in suitable regions.
人工种草草地很少用于家畜养殖和放牧；然而，不同的饲草可以为家畜提供各种营养，这可能有益于动物的健康和福利。我们建立了人工种草草地，并采用了轮牧制度，在夏季放牧期间监测地上生物量和绵羊体重的变化，通过近红外光谱法测量饲草的养分，通过气相色谱法测试中长链脂肪酸的含量，探索适合农牧交错区的高效绵羊育肥系统。结果表明，单个放牧围场内的最大饲草供应量为 4.6 kg DM/d，最高干物质采食量（DMI）为 1.80 kg DM/只/天，平均日增重（ADG）为 193.3 g，DMI 和 ADG 呈显著正相关（<0.05），平均饲料增重比（F/G）达到 8.02。绵羊的平均粗蛋白和可代谢能摄入量分别为 286 g/只/天和 18.5 MJ/只/天，羊肉中多不饱和脂肪酸的 n-6/n-3 比值为 2.84。结果表明，该绵羊育肥系统具有较高的饲料转化效率，能够提高绵羊的产量和品质，可在适宜地区推广。
