本文選題：泌乳奶牛 + 粗飼料��； 參考：《動物營養(yǎng)學(xué)報》2017年08期

【摘要】：本試驗旨在研究不同飼糧條件下泌乳奶牛對乳脂前體物的攝取和利用規(guī)律。選取體重為(617±21)kg、泌乳天數(shù)為(120±20)d的9頭健康泌乳荷斯坦奶牛為試驗動物,采用3重復(fù)3×3拉丁方設(shè)計,隨機分為3組,其中2組飼糧的精飼料配方不同,粗飼料相同均為秸稈,精粗比均為6∶4(分別稱之為CSA和CSB組),余下1組以羊草、苜蓿干草、全株玉米青貯為混合粗飼料,精粗比為4∶6(MF組),每組3頭;試驗期84 d,分為3期,每期28 d,包括21 d的預(yù)試期及7 d的正試期。結(jié)果表明:1)各組產(chǎn)奶量及乳成分差異不顯著(P0.05),但MF組的泌乳效率顯著高于CSA和CSB組(P0.05)。2)各組飼糧C16∶0和C18∶0攝取量差異不顯著(P0.05);MF組飼糧C18∶1 c9攝取量顯著低于CSA和CSB組(P0.05)。3)MF組動脈血漿中長鏈脂肪酸和總脂肪酸含量均高于CSA和CSB組,特別是C18∶3 n3含量顯著高于CSA和CSB組(P0.05)。4)MF和CSB組乳腺C18∶3 n3攝取量(日平均值)顯著高于CSA組(P0.05);各組乳腺對其他長鏈脂肪酸的攝取量差異不顯著(P0.05)。5)最終體現(xiàn)在乳中,表現(xiàn)為MF組的C18∶3 n3產(chǎn)量較CSA和CSB組有升高的趨勢(0.05≤P0.10),而原本乳腺攝取量無顯著差異的C18∶2 n6(P0.05),在乳中產(chǎn)量顯著低于CSA和CSB組(P0.05)。由此可見,相同粗飼料、不同精飼料飼糧對泌乳奶牛生產(chǎn)性能無顯著影響,而優(yōu)質(zhì)的粗飼料即使在精飼料比例降低的前提下,對乳中脂肪酸的組成及產(chǎn)量仍可以產(chǎn)生影響,使其更傾向于有利人體健康。
[Abstract]:The purpose of this study was to study the intake and utilization of milk fat precursors in lactating cows under different dietary conditions. Nine healthy lactating Holstein cows with body weight of 617 鹵21kg and lactation days of 120 鹵20 days were selected as experimental animals. The three repeated 3 脳 3 Latin square designs were used and randomly divided into 3 groups. The ratio of fine to crude was 6: 4 (called CSA and CSB group, respectively), the remaining group was treated with Leymus chinensis, alfalfa hay, whole plant corn silage as mixed forage, and the ratio of concentrate to crude was 4:6(MF group with 3 heads in each group, and the experiment period was 84 days, which was divided into three periods. Each period of 28 days, including 21 days of pre-test period and 7 days of positive test period. The results showed that there was no significant difference in milk yield and milk composition among different groups, but the lactation efficiency of MF group was significantly higher than that of CSA and CSB groups (P0.05 路2). There was no significant difference in dietary C16: 0 and C18: 0 intake in all groups. The contents of long chain fatty acids and total fatty acids in arterial plasma of CSA and CSB groups were higher than those of CSA and CSB groups. In particular, the content of C18: 3n3 was significantly higher than that of CSA and CSB groups (P0.05N. 4F) and CSB groups (C183n3 intake (daily average) was significantly higher than that of CSA group (P0.05N), and the difference of mammary gland intake of other long-chain fatty acids in each group was not significant (P0.05N. 5). The results showed that the yield of C18: 3n3 in MF group was significantly higher than that in CSA and CSB groups (0.05 鈮，

本文編號：1940413