本文關(guān)鍵詞： 杜蒙母羊 妊娠期 哺乳期 能量 蛋白質(zhì) 需要量　出處：《內(nèi)蒙古農(nóng)業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本試驗(yàn)選取15只體況相近的杜泊羊與蒙古羊雜交一代母羊隨機(jī)分為三組,每組飼養(yǎng)水平分別為自由采食、80%自由采食、60%自由采食,按照NRC標(biāo)準(zhǔn)配制并供給日糧,運(yùn)用碳氮平衡的原理,在空懷期、妊娠期、哺乳期共進(jìn)行七次消化代謝試驗(yàn)并結(jié)合呼吸測(cè)熱試驗(yàn),得出母羊蛋白和能量的消化代謝規(guī)律及需要量。結(jié)果從以下三方面簡(jiǎn)述:試驗(yàn)1:飼喂水平對(duì)杜蒙F1母羊空懷期、妊娠期、哺乳期消化代謝的影響。杜蒙雜交母羊干物質(zhì)攝入量、糞排出量、干物質(zhì)消化量隨飼喂水平的降低顯著降低,干物質(zhì)、N的表觀消化率消化率有升高趨勢(shì),總體干物質(zhì)消化率哺乳期空懷期妊娠期,母羊糞C,尿C,二氧化碳C,甲烷C的排出均因限飼的影響而降低,糞能、尿能、甲烷能均隨飼喂水平的降低而降低,飼喂水平影響了母羊?qū)I(yíng)養(yǎng)物質(zhì)的消化利用情況。試驗(yàn)2:杜蒙F1母羊氮代謝與維持凈N需要量的研究。隨飼喂水平的降低,杜蒙F1母羊食入氮、糞氮、消化氮、氮沉積量、乳氮顯著降低,氮的表觀消化率有升高趨勢(shì),母羊在空懷期,妊娠期40、70、120d,哺乳期 20、50、80d 維持凈 N 的需要量分別為 209.4、279.1、357.9、441.6、305.1、336.0、282.7mg·kg-1W0.75·d-1。試驗(yàn)3:杜蒙F1母羊能量代謝與維持凈能、維持代謝能需要量的研究。隨飼喂水平的降低,杜蒙F1母羊糞碳、尿碳、CO2碳、甲烷碳損失的碳顯著降低,碳的表觀消化率有升高趨勢(shì),在空懷期、妊娠期40、70、120d,哺乳期 20、50、80d 時(shí) NEm 的量分別為 145.01、164.77、176.88、199.38、303.67、318.56、288.01KJ/kgW0.75d,MEm 需要量分別為 200.17、244.17、275.54、303.04、466.87、442.69、372.39KJ/kgW0.75d,代謝能的利用效率 Km 分別為 72.44%、67.48%、64.19%、65.79%、65.04%、71.96%、77.34%。
[Abstract]:In this experiment, 15 crossbred ewes with similar body condition were randomly divided into three groups. The feeding level of each group was 80% free feed and 60% free feed. The diets were prepared and fed according to NRC standard. Based on the principle of carbon and nitrogen balance, seven digestive and metabolic tests were carried out during empty pregnancy, pregnancy and lactation and combined with respiratory calorimetry. Results: experiment 1: the effect of feeding level on digestibility and metabolism of Dumont F1 ewes during pregnancy, gestation and lactation, and dry matter intake of Dumont crossbred ewes, were summarized in the following three aspects: (1) the effect of feeding level on digestibility and metabolism in Dumont F1 ewes during pregnancy, gestation and lactation. Fecal excretion and dry matter digestibility decreased significantly with the decrease of feed level, and the apparent digestibility of dry matter N increased, and the total dry matter digestibility increased during pregnancy during lactation. The excretion of fecal C, urine C, carbon dioxide C and methane C of ewe decreased due to the effect of feeding restriction, while fecal energy, urine energy and methane energy decreased with the decrease of feed level. Feeding level affected digestibility and utilization of nutrients in ewe. Experiment 2: nitrogen metabolism and net N requirement of Dumont F1 ewes. With the decrease of feed level, DumonF1 ewe fed nitrogen, fecal nitrogen, digestible nitrogen and nitrogen deposition. The apparent digestibility of nitrogen in milk decreased significantly, and the apparent digestibility of nitrogen increased. The net N requirement of ewe during gestation, gestation and lactation was 209.4N 279.1g 路kg-1W0.75 路d-1.The energy metabolism and maintenance net energy of Dumeng F1 ewe were 209.4N 279.1g 路kg-1W0.75 路d-1.336.0mg 路kg-1W0.75 路d -1 and 357.9mg 路kg-1W0.75 路d ~ (-1) 路d ~ (-1), respectively, during empty pregnancy, gestation period and lactation period were 209.4n ~ 279.1g 路kg-1W0.75 路d ~ (-1), respectively. With the decrease of feeding level, fecal carbon, urine carbon and methane carbon loss of Dumont F1 ewes decreased significantly, and the apparent carbon digestibility increased. At 120 days of gestation and 20 days of lactation, the amount of NEm was 145.01g / kg 164.77 / 176.882 / 199.38303.67N / 318.56N / 288.01K / kg / kg W0.75dm respectively. The requirements of MEm were 200.17244.174.174.275.54.275.44.4466.8N 442.9372.39KJ / kg W0.75d, respectively. The utilization efficiency of ME was 62.447.487.484.19 / 64.190.65.790.645.040.75.
【學(xué)位授予單位】：內(nèi)蒙古農(nóng)業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：S826

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