本文選題：妊娠期 + 綿羊　； 參考：《河北農(nóng)業(yè)大學(xué)》2015年碩士論文

【摘要】：試驗選擇24只健康、體況相近的道賽特和小尾寒羊雜交一代經(jīng)產(chǎn)母羊,隨機分3組,自由采食組、80%限飼組、60%限飼組,按NRC(2007)飼養(yǎng)標(biāo)準(zhǔn)設(shè)計日糧,在妊娠第60天和120天分別進行消化代謝和呼吸測熱試驗。結(jié)果顯示:(1)妊娠期道寒雜交母羊的平均日增重隨飼喂水平的降低而降低,其中自由采食組在妊娠前期和后期分別能達到250.06和253.87g/d;妊娠期母羊的飼料報酬率隨飼喂水平的降低而降低。(2)飼喂水平對妊娠期道寒雜交母羊營養(yǎng)物質(zhì)的消化代謝有顯著影響:隨飼喂水平的降低,采食量降低,干物質(zhì)消化率升高,且二者在妊娠前期自由采食組與60%限飼組間差異顯著(P0.05);隨飼喂水平的降低,食入氮、糞氮、氮沉積和氮沉積/食入氮下降,氮的消化率升高,其中,食入氮、糞氮和氮的消化率在妊娠前期自由采食組與60%限飼組間差異顯著(P0.05);隨飼喂水平的降低,糞能、尿能和甲烷能降低,總能消化率、總能代謝率和消化能代謝率上升,其中,糞能在妊娠前期自由采食組與60%限飼組間差異顯著(P0.05),其余在各組間差異不顯著(P0.05);隨飼喂水平的降低,糞碳、尿碳、甲烷碳和二氧化碳碳降低,而碳的消化率上升,其中糞碳在妊娠前期自由采食組與60%限飼組間差異顯著(P0.05)。(3)妊娠前期和后期母羊的凈氮維持需要量分別為294.4和358.8 mg/kg W0.75·d,凈蛋白質(zhì)維持需要量分別為1.840和2.242 g/kg W0.75·d;妊娠前期和后期不同體重下母羊的凈蛋白質(zhì)生長需要量分別為47.4299BW0.2005g/d和11.1110BW0.5982g/d。(4)妊娠前期和后期母羊的凈能維持需要量分別為208.64和258.58k J/kg W0.75·d,代謝能維持需要量分別為367.66和497.70 k J/kg W0.75·d,代謝能的維持利用效率分別為0.567和0.519;妊娠前期和后期不同體重下母羊的凈能生長需要量分別為10-3.5616×BW2.2479和10-2.6841×BW1.9523,代謝能生長需要量分別為10-3.4056×BW2.2479和10-2.5098×BW1.9523,代謝能的生長利用效率分別為0.6983和0.6694。
[Abstract]:The test selected 24 healthy, dorsat and Small Tail Han sheep crossbred ewes with similar body condition, were randomly divided into 3 groups, free feeding group, 80% restriction group, 60% restriction group, according to NRC (2007) design of feeding standard diet in pregnancy sixtieth days and 120 days respectively for digestion metabolism and breath calorimetric test. The results showed: (1) during the period of Han crossbred ewe gestation road ADG decreased with the feeding level and decrease the free feeding group in early and late pregnancy can respectively reach 250.06 and 253.87g/d; the feed rate of pregnancy ewes with lower and lower feed level. (2) have a significant effect on digestion and metabolism of feeding levels during pregnancy tract nutrient: Han crossbred ewes with reduced feeding level, feed intake, digestibility of dry matter increased significantly, and the two in the first trimester of pregnancy free feeding group and 60% difference between limited feeding group (P0.05); with the decrease of feed level the ,椋熷叆姘，

本文編號：1740198