Susin I, Loerch S C, McClure K E, Day M L
Department of Animal Sciences, Ohio Agricultural Research and Development Center, Wooster, USA.
J Anim Sci. 1995 Nov;73(11):3206-15. doi: 10.2527/1995.73113206x.
In Exp. 1, 39 ewe lambs (initial BW 29 +/- .1 kg) were used in a 2 x 2 factorial arrangement with two breeds (Polypay and Targhee) and two diets (high-forage and high-grain) to examine the effects of restricting intake of a high-grain diet on onset of puberty and lamb performance. The experimental diets were fed from 13 to 40 wk of age. The high-forage diet was composed of 80% alfalfa cubes and 20% supplement. The high-grain diet was 90% concentrate and 10% alfalfa cubes. Feed intake of the diets was controlled so that lambs fed the high-grain diet had the same growth rate as those fed the high-forage diet. Plasma insulin concentration was higher (P < .001) for lambs fed the high-grain diet than for those fed the high-forage diet. However, no diet effect on age at puberty was observed. In Exp. 2, 88 mature Targhee ewes were used to determine the effects of limiting intake of a high-grain diet on pregnancy and number of lambs born per ewe. Intake of the high-grain diet was restricted to achieve similar ME intake between diets. There were no diet effects on number of lambs born per ewe or subsequent lamb performance. Ewes fed the high-forage diet had a lower (P < .001) weight gain than those fed the high-grain diet. It was concluded that restricting intake of high-grain diets is an effective alternative to feeding high-forage diets for meeting the nutrient requirements of ewe lambs and gestating ewes; however, no improvements on reproductive performance were observed.
在实验1中，选用39只母羊羔羊（初始体重29±0.1千克），采用2×2析因设计，涉及两个品种（波利佩和塔尔基）和两种日粮（高粗饲料和高谷物），以研究限制高谷物日粮摄入量对青春期开始和羔羊生产性能的影响。实验日粮从13周龄喂至40周龄。高粗饲料日粮由80%苜蓿块和20%补充料组成。高谷物日粮为90%精料和10%苜蓿块。控制日粮的采食量，使饲喂高谷物日粮的羔羊与饲喂高粗饲料日粮的羔羊生长速度相同。饲喂高谷物日粮的羔羊血浆胰岛素浓度高于饲喂高粗饲料日粮的羔羊（P<0.001）。然而，未观察到日粮对青春期年龄有影响。在实验2中，选用88只成年塔尔基母羊，以确定限制高谷物日粮摄入量对妊娠和每只母羊产羔数的影响。限制高谷物日粮的摄入量，以使日粮间的代谢能摄入量相似。日粮对每只母羊产羔数或随后的羔羊生产性能没有影响。饲喂高粗饲料日粮的母羊体重增加低于饲喂高谷物日粮的母羊（P<0.001）。得出的结论是，限制高谷物日粮的摄入量是满足母羊羔羊和妊娠母羊营养需求的一种有效替代高粗饲料日粮的方法；然而，未观察到繁殖性能有所改善。
