Effects of feeding a high-grain diet at a restricted intake on lactation performance and rebreeding of ewes.
Effects of feeding a high-grain diet at a restricted intake on lactation performance and rebreeding of ewes.
复制标题
限制摄入量的高谷物饮食对母羊泌乳性能和再繁殖的影响。
DOI：
10.2527/1995.73113199x
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发表时间：
1995
影响因子：
3.3
通讯作者：
K. Mcclure
中科院分区：
文献类型：
--
作者：
I. Susin;S. Loerch;K. Mcclure
在两项实验中使用了 56 只成熟 Polypay 母羊，以研究限制摄入量的高谷物饮食对产奶量和成分、羔羊性能和反季节繁殖的影响。母羊饲喂高谷物日粮（85% 精料和 15% 草料）或高草料日粮。实验1中的高粗饲料日粮为68％粗饲料和32％精料，实验2中为80％粗饲料和20％精料。实验2中为粗饲料和20％精料。饲料来源是果园干草（实验1）或苜蓿块（实验2）。高谷物饲料的采食量限制了 20%（与饲喂高饲料的母羊相比），因此两个饲料组的能量摄入量相似。实验中每日产奶量增加了 19% (P < .05)。实验中高出 1 和 8% (P < .10)。 2 饲喂高谷物的母羊与饲喂高草料的母羊相比（实验 1 和 2 中分别为 2.71 vs 2.28 kg/d 和 3.18 vs 2.95 kg/d）。与饲喂高粗饲料的母羊相比，饲喂高谷物日粮的母羊的乳蛋白百分比和日乳蛋白量较高（P < .05），乳脂百分比较低（P < .03）。饮食不影响乳脂产量（克/天）或羔羊生长速度。在这两个实验中，饲喂高谷物饲料的母羊的血液胰岛素浓度高于饲喂高饲料饲料的母羊。然而，没有观察到生殖性能的改善。限制饲喂高谷物日粮是泌乳母羊饲料的有效替代方案。
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.