玉米处理方法对泌乳牛泌乳性能、养分消化和血液指标的影响
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摘要
一、煮玉米比例对泌乳牛产乳性能、养分消化和血液指标的影响 
     试验采用 4×4 拉丁方设计,研究在自由采食“麦秸+玉米秸秆青贮”的粗饲料条
    件下,煮玉米比例对中低产的黑白花中期泌乳牛产乳性能、养分消化和血液指标的影响。
    四处理组分别为 0/3 煮玉米组(对照组)、1/3 煮玉米组、2/3 煮玉米组和 3/3 煮玉米组。
    日粮中玉米全部粉碎,平均粒度为 1.4mm。煮玉米比例为处理玉米与日粮总玉米的比值。
    结果表明,与对照组相比,煮玉米比例不影响各类饲料采食量、DMI、乳中脂肪、蛋白、
    乳糖、SNF、固形物含量和乳密度。1/3 煮玉米提高原乳及 FCM 产量 3.9%和 4.0%(P<0.05),
    2/3 和 3/3 煮玉米组不影响饲料采食量和乳产量(P>0.05),1/3、2/3 和 3/3 煮玉米组
    提高了 DM、OM、能量、淀粉的全消化道表观消化率,降低了 NDF 和 ADF 消化率。1/3、
    2/3 和 3/3 煮玉米对 CP 消化率的影响未达显著水平,但 2/3 组与 1/3 组相比,CP 消化
    率下降了 9.4%(P<0.05)。1/3 煮玉米组与 0/3、2/3 和 3/3 煮玉米组相比降低了粪便含
    水率(P<0.05)。1/3、2/3 和 3/3 煮玉米组分别降低血浆葡萄糖浓度 12.1%(P>0.05)、
    19.2%和 21.1%(P<0.05),提高尿素氮浓度 2.4%(P>0.05)、19.3%和 17.5%(P<0.05)。
    综上,在自由采食“麦秸+玉米秸秆青贮”的粗饲料条件下,煮沸处理中低产的黑白花
    中期泌乳牛日粮中 1/3 玉米,可显著提高泌乳性能。 
     二、烫玉米比例对泌乳牛泌乳性能的影响 
     实施两个试验,研究烫玉米在不同粗饲料条件下对泌乳牛产奶性能的影响。日粮中
    玉米全部粉碎,平均粒度为 1.4mm。烫玉米比例为处理玉米与日粮总玉米的比值。试
    验 1:选择四头荷斯坦中期泌乳牛,采用 4×4 拉丁方设计,研究在自由采食“麦秸+青
    贮玉米”的粗饲料条件下,烫玉米比例对产乳性能的影响。四处理组分别为 0/3 烫玉米
    组(对照组)、1/3 烫玉米组、2/3 烫玉米组和 3/3 烫玉米组。结果表明,烫玉米比例不
    影响 DMI 和乳中脂肪、蛋白、SNF 含量和乳密度(P>0.05)。2/3 烫玉米组分别提高了
    原乳和 FCM 产量 6.4%(P<0.05)和 7.0%(P>0.05),1/3 和 3/3 烫玉米组不影响原乳
    和 FCM 产量(P>0.05)。试验 2:6 头荷斯坦中期泌乳牛随机分为两组,每组 3 头,采用
    
    
    2 重复 3×3 拉丁方设计,研究在每天投喂 15kg 苜蓿青草和自由采食青贮玉米的粗饲料
    条件下烫玉米的效果。三个处理组分别为 0/4 烫玉米组(对照组)、1/4 烫玉米组和 2/4
    烫玉米组。结果表明,烫玉米比例不影响各类饲料采食量、DMI、乳密度和乳脂、乳蛋
    白、SNF 含量和乳密度。1/4 烫玉米不影响原乳和 FCM 产量,2/4 烫玉米极显著降低了
    原乳产量(P<0.01),不影响 FCM 产量。结果显示,在“麦秸+青贮”的粗饲料条件下,
    2/3 烫玉米可显著改善泌乳性能;在“苜蓿青草+青贮”的粗饲料条件下,烫玉米有降
    低乳产量的趋势。 
     三、泡玉米和煮玉米对泌乳牛泌乳性能的影响 
     8 头荷斯坦中期泌乳牛随机分为两组,每组 4 头,采用 2 个 4×4 拉丁方,分别研究
    在自由采食“麦秸+青贮玉米”和每天投喂 3.5kg苜蓿干草和自由采食青贮玉米的粗饲
    料条件下,煮玉米和泡玉米对荷斯坦中期泌乳牛产乳性能的影响。四处理组分别为对照
    组、1/3煮玉米组、1/3泡玉米组和2/3泡玉米组。日粮中玉米全部粉碎,平均粒度为1.4mm。
    处理玉米比例为处理玉米与日粮总玉米的比值。 与对照组相比,在麦秸日粮条件下,
    泡玉米比例不影响 DMI,乳产量和 FCM 产量随使用比例提高而线性提高,但均未达显
    著水平(P>0.05)。乳脂、乳蛋白、SNF 和固形物含量和产量,及饲料利用效率不受泡
    玉米比例的影响。与对照组相比,1/3 煮玉米趋于提高青贮、麦秸及 DMI(P>0.05),提
    高乳产量 4.6%和 FCM 产量 3.8%(P<0.05),不影响乳脂、乳蛋白、SNF 和固形物含量
    (P>.05),提高饲料利用效率;在苜蓿干草日粮条件下,泡玉米比例不影响 DMI、乳
    产量、FCM 产量、乳密度,乳脂、乳蛋白、SNF 和固形物含量,及饲料利用效率(P>0.05)。
    与对照组相比,1/3 煮玉米不影响 DMI、乳产量和 FCM 产量(P>0.05),趋于降低乳脂、
    乳蛋白、SNF 和固形物含量和乳密度,不影响饲料利用效率(P>0.05)。与 2/3 泡玉米
    相比,1/3 煮玉米降低乳脂率(P>0.05)、乳蛋白率、SNF 和固形物含量(P<0.05),不
    影响乳密度和饲料利用效率。结果显示,在“麦秸+青贮”的粗饲料条件下,1/3 煮玉
    米可提高泌乳性能;在“苜蓿干草+青贮”的粗饲料条件下,泡玉米和煮玉米不影响泌
    乳性能。
Effects of Percentage of Boiled Corn on Lactational Performance, Nutrient
    Digestibility, and Contents of Plasma Glucose and Urea Nitrogen of
    Lactating Cows
     Four midlactation Holstein cows were used in a 4×4 Latin square design to determine the
    effects of the percentage of boiled corn(BC) on lactational performance, nutrient digestibility,
    and contents of plasma glucose and urea nitrogen in roughage of wheat straw and corn silage.
    Four treatments were 0/3 boiled corn, 1/3 boiled corn, 2/3 boiled corn and 3/3 boiled corn
    respectively. All corn in diets was cracked with mean particle size of1.4mm. Processing corn
    percentage was the proportion of processing corn to all corn in diet. DMI, percent of milk fat,
    protein, lactose, and SNF, and milk density were not affected by treatments. Compared to
    0/3BC, 1/3BC increased 3.9% of milk yield and 4.0% of FCM yield (P<0.05), and 2/3BC and
    3/3BC did not affect yield of milk and FCM, 1/3BC, 2/3BC and 3/3BC increased total tract
    digestibility of DM, OM, energy and starch, and decreased total tract digestibility of NDF and
    ADF. Compared to 0/3BC, 1/3BC, 2/3BC and 3/3BC did not affect total tract digestibility of
    CP (P>0.05), but relative to 1/3BC, 2/3BC decreased 9.4% of total tract digestibility of CP
    (P<0.05). Compared to 0/3BC, 2/3BC and 3/3BC, 1/3BC decreased the moisture of feces
    (P<0.05). Relative to 0/3BC, 1/3BC, 2/3BC and 3/3BC decreased 12.1% (P>0.05), 19.2% and
    21.1% (P<0.05) of plasma glucose concentration, and increased 2.4%(P>.05), 19.3% and
    17.5% (P<0.05) of urea nitrogen concentration, respectively.
    Effects of Percentage of Scalded Corn on Lactational Performance of
    Lactating Cows
    
    
    Two experiments were conducted to investigate the effects of the percentage of scalded
    corn (SC) on lactational performance of lactating cows. All corn in diets was cracked with
    mean particle size of 1.4mm. Processing corn percentage was the proportion of processing
    corn to all corn in diet. Trial 1: Four midlactation Holstein cows were used in a 4×4 Latin
    square design to determine the effects of the percentage of SC on lactational performance in
    roughage of wheat straw and corn silage. Four treatments were 0/3 SC, 1/3 SC, 2/3 SC and
    3/3 SC. The results show that: DMI, percent of milk fat, protein and SNF, and milk density
    were not affected by treatments; compared to 0/3BC 2/3BC increased 6.4% of milk yield
    (P<0.05)and 7.0% of FCM yield (P>.05), and there are no significant difference of milk
    yield and FCM yield among 0/3BC, 1/3SC and 3/3SC (P>0.05). In trail 2: six midlactation
    Holstein cows were used in two replicate 3×3 Latin square design to determine the effects of
    the percentage of SC on lactational performance in roughage of green alfalfa and corn silage.
    Three treatments were 0/4 SC, 1/4 SC and 2/4 SC. The results show that: DMI, percent of
    milk fat, protein and SNF, and milk density were not affected by treatments; compared to
    0/3BC, 1/4SC did not affect milk and FCM yield (P>0.05), but 2/4SC decreased significantly
    milk yield (P<0.01)and did not affect FCM yield (P>.05). In conclusion, the optimal
    percentage is 2/3, and 2/3SC increased lactational performance the in roughage of wheat
    straw and corn silage, but SC tended to decrease lactational performance in forage of green
    alfalfa and corn silage.
    Effects of Percentage of Socked Corn on Lactational Performance of
    Lactating Cows
     Eight midlactation Holstein cows were allotted to 2 groups, and were used in two 4×4
    Latin square design to determine the effects of boiled corn(BC) and socked corn (SKC) on
    lactational performance of lactating cows in forage of wheat straw and corn silage and in
    forage of alfalfa hay and corn silage, respectively. Four treatments were control, 1/3 BC, 1/3
    SKC and 2/3 SKC. All corn in diets was cracked with mean particle size of 1.4mm.
    Processing corn percentage was the proportion of processing corn to all corn in diet. In forage
    of wheat straw and corn silage, compared to the control, 1/3SKC and 2/3SKC did not affect
    
    
    DMI, per
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