University of Catania, DISPA, Sezione di Scienze delle Produzioni Animali, Via Valdisavoia 5, 95123 Catania, Italy.
Meat Sci. 2012 Jan;90(1):93-8. doi: 10.1016/j.meatsci.2011.06.009. Epub 2011 Jun 12.
The aim of this study was to assess whether different grazing management affect animal performance and meat fatty acid composition. Thirty-five lambs were divided into three groups: 12 lambs grazed from 9 am to 5 pm (8 h group); 11 lambs grazed from 9 am to 1 pm (4hAM group) and 12 lambs grazed from 1 pm to 5 pm (4hPM group). The trial was conducted over 72 days. The 8 h lambs had greater DMI (P<0.0005) and final body weight (P<0.05) than the 4hPM and 4hAM lambs while carcass weight was not different between the three groups. The meat of the 4hPM lambs contained greater (P<0.05) percentages of polyunsaturated fatty acids, C18:2 cis-9 trans-11 and lower saturated fatty acids and C18:0 than the meat of the 8 h and 4hAM lambs. It is concluded that allowing lambs to graze during the afternoon rather than during 8 h does not compromise the carcass yield and results in a healthier meat fatty acid profile.
本研究旨在评估不同的放牧管理方式是否会影响动物生产性能和肉的脂肪酸组成。将 35 只羔羊分为三组：12 只羔羊从上午 9 点到下午 5 点（8 小时组）；11 只羔羊从上午 9 点到下午 1 点（4 小时 AM 组）；12 只羔羊从下午 1 点到下午 5 点（4 小时 PM 组）。试验进行了 72 天。8 小时组的羔羊的 DMI（P<0.0005）和末重（P<0.05）均大于 4 小时 PM 组和 4 小时 AM 组，而三组间胴体重无差异。4 小时 PM 组羔羊的肉中多不饱和脂肪酸（P<0.05）、C18:2 cis-9 trans-11 和饱和脂肪酸、C18:0 的百分比更高，而 8 小时组和 4 小时 AM 组羔羊的肉中则更低。结论是，让羔羊在下午而不是 8 小时内放牧不会影响胴体产量，并使肉的脂肪酸组成更健康。
