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首页> 外文会议>ANPA-European Association for Animal Production-CIHEAM-Food and Agriculture Organization of the United Nations Symposium >The effect of supplement on the grazing behaviour and performances of sheep on mature rangeland in Tunisia
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The effect of supplement on the grazing behaviour and performances of sheep on mature rangeland in Tunisia

机译：补充对突尼斯成熟牧场放牧行为和性能的影响

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Under Tunisian conditions and with advancing grazing season, the nutritive value of herbaceous range vegetation becomes too low to support animal production. This is a study of the effect of using a liquid supplement as a source of energy, protein, minerals and vitamins on both animal performances and on the preservation of the vegetation cover. In the experiment 84 females lambs of the "Noire de Thibar" breed, of average age eight months and weighing on the average 22 +- 1.5 Kg were allotted to six similar groups based on liveweight (LW). Three groups of animals had free access to the rotating feeding wheel units filled with a 90 percent sugar beet molasses, 5 percent urea and 5 percent mineral+vitamins liquid supplement mixture. The analysed data showed the following: Mean botanical composition was 42, 35.6, 18.5 and 6 percent for other Herbaceous (OH), perennial grass (PG) annual grass (AG) and legumes respectively. This available vegetation has 5.5, 5.1 and 35.6 percent CP, ash and ADF content respectively. The supplement did not affect the disappearance of the vegetation (53 and 55 percent). However available LE and PG species showed a decline of 1.5 and 8.3 percent respectively while OH and AG species increased 4.2 and 5.5 percent respectively. The supplement favoured PG and LE intake while OH and AG intake was decreased. DM content of the grazing diet was higher for the supplemented than the control animals (88.4 vs 81.2 percent) The supplement did not affect the grazing parameters: resting time, walking time and total feeding time: all these were similar for both treatment (29.2, 10.7 and 60.1 percent for the supplemented vs 26.5, 12.0 and 61.5 percent respectively for the control animals). The supplement affected the DM intake and the nutritive value of the ingested diet and led to better live weight gains (22.6 Kg / ha and 6.7 Kg / ha for the supplemented and the control animals respectively) and better net return (70.9 TD vs 22.0 TD).
机译：在突尼斯条件下和推进放牧季节，草本范围植被的营养价值太低而无法支持动物生产。这是对使用液体补充剂作为能量，蛋白质，矿物质和维生素来源的效果的研究，并且在动物表演中以及植被覆盖的保存。在实验84中，“Noire De Thibar”品种的女性羊羔，平均年龄为8个月，称重平均22 + - 1.5公斤，以六个类似的群体基于Liveweight（LW）。三组动物可以自由进入旋转的饲养轮单元，含有90％的糖浆糖蜜，5％尿素和5％的矿物+维生素液补充混合物。分析的数据显示：分别为22,35.6,18.5和6％的平均植物组合物分别为42,35.6,18.5和6％，分别为多年生草（PG）年草（AG）和豆类。该可用植被分别具有5.5,5.1和35.6％的CP，灰和ADF含量。补充不影响植被的消失（53和55％）。然而，可用的LE和PG物种分别显示1.5％和8.3％，而OH和AG物种分别增加4.2％和5.5％。补充剂赞成PG和Le Intake，而OH和Ag摄入量减少。涂层饮食的DM含量高于对照动物（88.4 vs 81.2％）补充剂不影响放牧参数：休息时间，步行时间和总喂养时间：所有这些都是相似的（29.2， 10.7和60.1％，用于对照动物分别为补充与26.5,12.0和61.5％的百分比）。补充剂影响了DM摄入量和摄入饮食的营养价值，并导致了更好的活体重（22.6kg / ha和6.7 kg / ha，分别为净化和对照动物）和更好的净返回（70.9 td vs 22.0 td ）。

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