摘要
Short-term effects of nutrition on conception rate (CR), ovulation rate (OR), ova and embryo losses (OEL) during the first 50 days following insemination and total reproductive wastage after ovulation (TRW), were investigated in primiparous lactating Sarda ewes after oestrous synchronisation and trans-cervical artificial insemination (AI). Eighty ewes grazing a green high-quality pasture were offered one of three iso-energetic supplements from day 14 before to day 2 after AI: whole maize grain (M); soyabean meal (S); maize gluten meal (G); or served as controls (C). Supplements G and S were iso-nitrogenous but provided different amounts of rumen undegradable digestible protein. The intake of herbage and digestible dry matter, measured by the n-alkane method, did not differ among groups, whereas crude protein intake before AI was greater in S and G than in M and C. Average OR was 2.0 per ewe. The frequency of double ovulations was greater in S than in the other groups. Only G-feeding was associated with some cases of OR>4. Ewes from the S group tended to show a higher CR (73%) than unsupplemented counterparts (45%), the other groups being intermediate (61% and 50% for M and G, respectively). Lower OEL during the first 50 days after AI was found in S ewes than in G, M and C being intermediate (0.52, 1.39, 1.11 and 1.10 per ewe, respectively). Milk urea content >560 mg/l was associated with lower CR. Ranking by ovulation groups of CR was single
摘要译文
营养对受孕率（CR），排卵率（OR），受精后50天内的卵子和胚胎损失（OEL）和排卵后的总生殖损耗（TRW），在发情同步和经子宫颈人工授精（AI）后对初产的泌乳Sarda母羊进行了调查。AI：全玉米籽粒（M）之后，从第14天至第2天，放牧绿色优质牧场的80只母羊提供三种等能量补充剂之一：大豆粉（S）;玉米面筋粉（G）;或担任对照（C）。补充物G和S是等氮的，但提供不同量的瘤胃不可降解的可消化蛋白质。采用正构烷烃法测定的牧草和可消化干物质的摄入量在各组间没有差异，而AI前的粗蛋白质摄入量在S和G上大于M和C平均OR是每只母羊2.0。 S的双排卵频率比其他组高。只有G-饲喂与OR 4的某些情况有关。来自S组的母羊倾向于显示出较高的CR（73％），而不是未补充的对照组（45％），其他组为中等（分别为M和G的61％和50％）。在母羊发现AI后50天内，OEL比G，M和C处于中等水平（分别为0.52,1.39,1.1和1.10）。牛奶尿素含量 560毫克/升与较低的CR有关。 CR排卵组排名单一
ABranca[a];GMolle[a];MSitzia[a];MDecandia[a];SLandau[b];. Short-term dietary effects on reproductive wastage after induced ovulation and artificial insemination in primiparous lactating Sarda ewes[J]. Animal Reproduction Science, 2000,58(1-2): 59-71