Susin I, Loerch S C, McClure K E
Department of Animal Sciences, Ohio Agricultural Research and Development Center, Wooster, USA.
J Anim Sci. 1995 Nov;73(11):3199-205. doi: 10.2527/1995.73113199x.
Fifty-six mature Polypay ewes were used in two experiments to examine the effects of feeding a high-grain diet at a restricted intake on milk production and composition, lamb performance and out-of-season breeding. Ewes were fed either a high-grain diet (85% concentrate and 15% forage) or a high-forage diet. The high-forage diets were 68% forage and 32% concentrate in Experiment 1 and 80% forage and 20% concentrate in Experiment 2. Forage forage and 20% concentrate in Experiment 2. Forage source was orchardgrass hay (Experiment 1) or alfalfa cubes (Experiment 2). Feed intake of the high-grain diet was restricted by 20% (compared with ewes fed high forage) so that intake of energy was similar for both dietary groups. Daily milk production was 19% higher (P < .05) in Exp. 1 and 8% higher (P < .10) in Exp. 2 for ewes fed high grain than for those fed high forage (2.71 vs 2.28 kg/d and 3.18 vs 2.95 kg/d in Exp. 1 and 2, respectively). Milk protein percentage and daily amount of milk protein were higher (P < .05) and the percentage of milk fat was lower (P < .03) for ewes fed the high-grain diet than for those fed the high-forage diet. Diet did not affect milk fat production (grams/day) or lamb growth rate. In both experiments blood insulin concentration was higher for ewes fed the high-grain diet than for those fed the high-forage diet; however, no improvements in reproductive performance were observed. Limit feeding high-grain diets is an effective alternative to forage for lactating ewes.
在两项试验中使用了56只成年波利佩羊母羊，以研究限制采食量的高谷物日粮对产奶量和奶成分、羔羊性能及非繁殖季节配种的影响。母羊分别饲喂高谷物日粮（85%精料和15%粗饲料）或高粗饲料日粮。在试验1中，高粗饲料日粮为68%粗饲料和32%精料，在试验2中为80%粗饲料和20%精料。粗饲料来源在试验1中为果园草干草，在试验2中为苜蓿块。高谷物日粮的采食量限制20%（与饲喂高粗饲料的母羊相比），以便两个日粮组的能量摄入量相似。在试验1中，饲喂高谷物日粮的母羊日产奶量比饲喂高粗饲料日粮的母羊高19%（P<0.05），在试验2中高8%（P<0.10）（试验1和试验2中分别为2.71对2.28千克/天和3.18对2.95千克/天）。饲喂高谷物日粮的母羊乳蛋白百分比和每日乳蛋白量较高（P<0.05），乳脂百分比较低（P<0.03）。日粮对乳脂产量（克/天）或羔羊生长速度没有影响。在两项试验中，饲喂高谷物日粮的母羊血液胰岛素浓度均高于饲喂高粗饲料日粮的母羊；然而，未观察到繁殖性能的改善。对泌乳母羊限量饲喂高谷物日粮是粗饲料的一种有效替代方法。
