不同阴阳离子水平日粮对围产期奶牛泌乳性能和血液生化指标的影响

为了研究阴离子盐对围产期奶牛产奶性能和血液生化指标的影响,选取20头中国荷斯坦奶牛,随机分成4组,每组5头,分别饲喂日粮阴阳离子平衡(DCAB)值为50.80 mmol/kg、-46.91 mmol/kg、-128.45mmol/kg、-213.44 mmol/kg的日粮,测定动物采食量、尿液pH值、产奶量、乳脂率、乳蛋白率和血清生化指标。结果表明:试验组Ⅱ(-128.45 mmol/kg)与对照组(50.80 mmol/kg)相比,产奶量提高13.4%(P<0.05),血清钙离子浓度提高12.9%(P<0.05),血清羟脯氨酸(HYP)浓度提高12.0%(P<0.01),血清碱性磷酸酶(ALP)浓度提高26.9%(P<0.01),血清骨钙素(BGP)浓度提高9.2%(P<0.05),血清甲状旁腺素(PTH)浓度降低20.54%(P<0.01),血清降钙素(CT)浓度提高27.72%(P<0.01)。试验结果证实,阴离子盐能够降低动物采食量和尿液pH值,提高产奶量、血清钙离子浓度和血清CT浓度,提高血清HYP、ALP和BGP浓度,降低血清肌酸磷酸激酶(CK)和谷丙转氨酶(ALT)浓度。

Effect of dietary cation-anion balance on lactating performance and blood biochemical parameters of perinatal dairy cows

In order to study the effect of dietary cation-anion balance(DCAB) on lactating performance and blood biochemical parameters in perinatal dairy cows,twenty Holstein lactating cows were divided into 4 experimental groups randomly,with 5 replicates per group,and the cows were fed with the diets containing four levels of DCAB,50.80 mmol/kg,-46.91 mmol/kg,-128.45 mmol/kg,and-213.44 mmol/kg respectively.The daily milk yield,percentages of milk fat and protein,feed intake,the urinary pH value,the ionic concentration of serum and blood biochemical parameters were determined.The result showed that the milk production of experimental groupⅡ(-128.45 mmol/kg) was increased by 13.4%(P<0.05),the blood serum Ca2+ concentration was increased by 12.9%(P<0.05),the blood serum hydroxyproline(HYP) concentration was increased by 12.0%(P<0.01),the blood serum alkaline phosphatase(ALP) concentration was increased by 26.9%(P<0.01),the blood serum bone gla protein(BGP) concentration was increased by 9.2%(P<0.05),the blood serum parathyroid gland(PTH) concentration was decreased by 20.54%(P<0.01),and the blood serum calcitonin(CT) concentration was increased by 27.72%(P<0.01),compared with the control group(50.80 mmol/kg).The experiment demonstrated that when prepartum diets were supplemented with anionic salts,the feed intake and the urinary pH value of cows decreased,the milk production,the blood serum Ca2+ concentration and the blood serum CT concentration increased,the blood serum HYP,ALP and BGP concentration elevated,and the blood serum craetinephosphokinase(CK) and alanine transaminase(ALT) concentration droped.