The effect of concentrate level on the intake of grass silages by ewes in late pregnancy
The effect of concentrate level on the intake of grass silages by ewes in late pregnancy
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妊娠后期精料水平对母羊采食青贮饲料的影响
DOI：
10.1017/s0003356100003846
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
T. Treacher
中科院分区：
文献类型：
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作者：
R. J. Orr;T. Treacher
在两个实验中，6个青贮饲料提供单独或恒定的每日水平的大麦为基础的浓缩物（450或900克鲜重每母羊），芬兰多塞特母羊携带1和4个胎儿之间的最后6周的怀孕。青贮饲料（S1至S3，实验1和S4至S6，实验2）具有256、190、278和294、216、201 g/kg鲜重的干物质（DM）浓度和106、164、212和119、148、194 g/kg DM的粗蛋白（CP）浓度。16和20周青贮饲料的平均代谢能浓度（消化能× 0.81）分别为9.2，10.3，12.0和8.8，10.9，11.0 MJ/kg DM。总ME摄入量在妊娠16周分别为12.6、13.5、18.6和14.5、15.1、16.8 MJ/d，在妊娠20周分别为11.6、11.2、17.2和12.2、11.8、13.3 MJ/d。通过提供更高水平的浓缩物增加总ME摄入量，对于0、450或900 g/天的水平，第16周为12.3、14.8、17.9 MJ/天，第20周为9.6、12.8、15.5 MJ/天。在试验1中，双胞胎或多胞胎母羊的采食量相似，但在试验2中，双胞胎或多胞胎母羊的采食量分别为单胞胎母羊的0.97和0.85。对于青贮饲料S1至S3和S4至S6，精料对草料的替代率分别为-0statist09、-0statist08、-0statist60和-0statist06、-0statist25、-0statist38g青贮饲料有机物（OM）/g精料OM。只有青贮饲料S6的替代率与零有显著差异。
In two experiments, six silages were offered either alone or with constant daily levels of a barley-based concentrate (450 or 900 g fresh weight per ewe) to Finn Dorset ewes carrying between one and four foetuses in the last 6 weeks of pregnancy. The silages (SI to S3, experiment 1 and S4 to S6, experiment 2) had dry matter (DM) concentrations of 256, 190, 278 and 294, 216, 201 g/kg fresh weight and crude protein (CP) concentrations of 106, 164, 212 and 119, 148, 194 g/kg DM. Mean metabolizable energy (ME) concentrations of the silages (digestible energy × 0·81), in weeks 16 and 20, were 9·2, 10·3, 12·0 and 8·8, 10·9, 11·0 MJ/kg DM. Total ME intakes were 12·6, 13·5, 18·6 and 14·5, 15·1, 16·8 MJ/day in week 16 of gestation and were 11·6, 11·2, 17·2 and 12·2, 11·8, 13·3 MJ/day in week 20. Total ME intakes were increased by offering higher levels of concentrates and for levels of 0, 450 or 900 g/day these were 12·3, 14·8, 17·9 MJ/day in week 16 and 9·6, 12·8, 15·5 MJ/day in week 20. Intakes were similar for ewes carrying twins or multiples in experiment 1, but in experiment 2, intakes by ewes with twins or multiples were proportionately 0·97 and 0·85 of those for ewes with singles. Replacement rates of forage by concentrates were —0·09, —0·08, —0·60 and —0·06, —0·25, —0·38 g silage organic matter (OM) per g concentrates OM for silages SI to S3 and S4 to S6. Only on silage S6 did the replacement rate differ significantly from zero.