单 位：
沈阳军区政治部农副业基地;东北农业大学动物科技学院;沈阳农业大学畜牧兽医学院
关键词：
2-羟基-4-甲硫基-丁酸异丙酯;血液生化指标;奶牛;生产性能;平衡日粮赖氨酸和蛋氨酸
摘 要：
本试验旨在探讨日粮补充2-羟基-4-甲硫基-丁酸异丙酯(HMBi)以平衡日粮赖氨酸和蛋氨酸对奶牛生产性能及血液生化指标的影响。将45头处于干奶后期2～3胎的荷斯坦奶牛,随机分配到A、B和C组中,每组15头奶牛。其中A组为对照组,整个试验期饲喂基础日粮;B组于产犊当天(产后第1天)开始、C组于产前15天开始在基础日粮中添加HMBi,以平衡日粮赖氨酸和蛋氨酸。试验期为产前15天到产后第90天。试验结果显示:与对照组相比,B和C组产奶量分别提高了3.24和3.97kg/d。C组乳脂率显著高于对照和B组(P<0.05),而对照和B组乳脂率差异不显著(P>0.05);B和C组均提高了乳脂的绝对产量,分别较对照组提高了0.14和0.18kg/d。不同组间的乳蛋白率差异不显著(P>0.05),但与对照组相比,B和C组乳蛋白的绝对产量分别提高了0.10和0.09kg/d。产后第90天,各组奶牛血清葡萄糖含量的差异不显著(P>0.05)。补充HMBi对奶牛牛奶尿素氮(MUN)、血清总氨基酸(TAA)、血清尿素氮(BUN)都没有显著影响(P>0.05),但有降低BUN和MUN的趋势。补充HMBi对游离脂肪酸(NEFA)、总胆固醇(TC)和甘油三酯(TG)含量的影响不显著(P>0.05),但有降低奶牛血清NEFA和TC的趋势。结果提示,通过补充HMBi来平衡日粮赖氨酸和蛋氨酸能显著提高奶牛的生产性能,具有改善奶牛代谢状况的趋势。
译 名：
Effects of Dietary Supplementation of 2-hydroxy-4-(methylthio) Butanoic Acid Isopropyl Ester on Productive Performance and Blood Biochemical Indexes in Dairy Cows
作 者：
XI Weibin1 XIA Ke2 ZHANG Yonggen2 ZHANG Minglei1 ZHANG Junling3(1. College of Animal Husbandry and Veterinary Medicine,Shenyang Agricultural University,Shenyang 110161,China; 2. College of Animal Science and Technology,Northeast Agricultural University,Harbin 150030,China; 3. Shenyang Military Area Command Political Department Agriculture and Sideline Occupations Base,Shenyang 110112,China)
关键词：
2-hydroxy-4-(methylthio) butanoic acid isopropyl ester; Dairy cows; Productive performance; Blood biochemical indexes; Balancing dietary Lys-Met
摘 要：
The trial was conducted to study the effects of supplementation of 2-hydroxy-4-(methylthio) butanoic acid isopropyl ester (HMBi) for balancing dietary Lys-Met on productive performance and blood biochemical indexes in dairy cows. Forty-five Holstein dairy cows with 2～3 embryoes in late dry period were selected and assigned randomly into A,B and C group which contained 15 dairy cows. Group A as control group was fed a basal diet during total experimental period; for balancing dietary Lys-Met,group B was fed the basal diet with HMBi supplementation started from calving (1 d post-partum),and the group C was fed the basal diet with HMBi supplementation from 15 d pre-partum. The experimental period was from 15 d pre-partum to 90 d post-partum. The results showed as follows: compared with control group,the milk yields in groups B and C were significantly increased by 3.24 and 3.97 kg/d,respectively (P<0.05). The milk fat percentage in group C was significantly higher than that in control group and group B (P<0.05),and there was no significant difference between control group and group B (P>0.05). The milk fat absolute yields in groups B and C were significantly increased by 0.14 and 0.18 kg/d (P<0.05) compared with control group,respectively. Although there was no significant difference in milk protein percentages among groups (P>0.05),the milk protein yield of groups B and C was 0.10 and 0.09 kg/d higher than that in control group (P<0.05),respectively. There was no significant difference of serum glucose among all groups at day 90 of post-partum (P>0.05). HMBi supplementation in dairy cows had no significant effects on milk urea nitrogen (MUN),blood urea nitrogen (BUN) and serum total amino acid (P>0.05); however,there was a decreasing tendency in BUN and MUN. The concentrations of serum non-esterified fatty acid (NEFA),triglyceride (TC) and total cholesterol were not significantly influenced by dietary HMBi supplementation (P>0.05),but there was a trend to decrease the NEFA and TC. The results indicated that balancing dietary Lys-Met by supplementation with HMBi could improve productive performances,and there was a tendency to improve metabolic conditions.
