チモシー(Phleum pratense L.)草地における集約放牧技術の開発 : 2.放牧牛の増体に及ぼす春期余剰草サイレージの併給効果 [in Japanese] Development of Intensive Grazing System Utilizing Timothy (Phleum pratense L.) Pasture. : 2. Effects of supplying silage harvested from the spring surplus pasture on a performance of grazing animals in the sward [in Japanese]
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チモシー(Phleum pratense L.)の晩生品種ホクシュウを用い, 草地の一部を春期に刈取り, 余剰草サイレージとして貯蔵し, 夏期以降このサイレージを併給しながら短期輪換放牧を行う放牧方法(SS区)と, 放牧地面積を変えずに短期輪換放牧を行い, サイレージの併給も行わない方法(NS区)について家畜生産性を比較した。SS区は, 現存量およびHerbage allowanceが放牧期間中を通してほぼ一定だったのに対し, NS区は, いずれも変動が大きかった。また, NS区の乾物消化率の変動はSS区に比べ大きく, 夏期間の低下が著しかった。両区とも夏期間に日増体量(DG)が低下する傾向がみられたが, SS区の夏期間のDGは0.7kg/dayで,NS区(0.3kg/day)に比べ高く, サイレージの併給による増体量改善効果が認められた。
Animal performances of steers (Aberdeen Angus and Holstein) and heifers (Aberdeen Angus) were investigated under the two types of intensive grazing system (SS and NS) on timothy (Hokushu, TY) swards (total area of 2.4 ha). One of the four herds (2 treatments of SS and NS×2 replications) consisted of four steers and two heifers of Angus and two steers of Holstein. The four experimental swards were divided into 35 paddocks respectively. In SS, from May- mid-June, 43% of total paddocks were used for grazing. The other paddocks were harvested for ensiling at early June, and then all the paddocks were used for grazing until the end of experiment. Herds of SS were supplied grass silage made from respective swards from mid-July to end of grazing. On the other hand NS swards were not harvest at all and were grazed rotationally using all paddocks from May to October. Grazing animals of NS were not supplied silage. Result obtained were as follows: (1)The herbage allowance in the SS sward, were kept the sufficient level at 4 kgDM/100kgBW throughout the grazing season. On the other hand that of the NS sward were fluctuated 2-8 kgDM/100kgBW. (2)Though dry matter digestibility (DMD) of TY on the SS sward were kept on level of about 70% during summer season, in the NS sward DMD of TY were fallen under 65%. (3)Total weight harvested as roll ball silage from the SS sward were 3,865 kgDM and dry matter digest- ibility were 71%. Daily intake of silage in SS herds were estimated 3.6kgDM/head/day from late June to end of grazing. (4)In summer daily gain of SS herds (0.70 kg/day) was high as compare with NS herds (0.28 kg/day). Therefor the total daily gain of SS herds was also higher than NS herds (0.81kg/day and 0.65 kg/day respectively). Cumulative body weight gains per unit land area over grazing season was higher in SS herds (721 kg/ha) than that in NS herds (624 kg/ha).
- Japanese Journal of Grassland Science
Japanese Journal of Grassland Science 46(2), 143-147, 2000
Japanese Society of Grassland Science