日粮钙水平对泌乳水牛生产性能的影响

为了探讨日粮钙水平对泌乳水牛生产性能的影响,本试验选用12头胎次、泌乳时间、泌乳量相近的水牛,随机分成4组,每组3头水牛。采用4×4拉丁方试验方法,4组水牛基础日粮中钙含量分别占基础日粮干物质的0.47%、0.62%、0.78%、0.93%,其他营养成分均相同,其中磷占采食干物质比例为0.50%;共4期试验,每一试验期21 d,其中预饲期7 d,正饲期14 d。试验结果表明:1、不同钙水平日粮对泌乳水牛的产奶性能影响不显著(P>0.05),但0.78%钙水平日粮组水牛的产奶量分别比其他3组提高5.4%、5.5%、3.9%,不同钙水平对水牛奶营养成分影响不显著(P>0.05)。2、不同钙水平日粮对水牛血浆中钙含量影响差异显著(P<0.05);随着日粮钙水平的上升,水牛血液甲状旁腺素和1,25二羟基维生素D呈显著下降趋势(P<0.05)。综合各指标,日粮钙占采食干物质的比例为0.78%能进一步提高泌乳水牛产奶量。

Effect of dietary calcium on the production performance in the lactating water buffalo

The objective of the present study was to evaluate the effect of dietary calcium on the production performance in the lactating water buffalo.A total of 12 water buffaloes with similar parity,milking date and milking yield were randomly divided into 4 groups,each group including 3 animals.The Latin square design was used,and the 4 group animal was subjected into 0.47,0.62,0.78 and 0.93% Ca(DM base),with the other nutrition parameter kept the same,except for the P was 0.50% based on dry matter intake.Four periods and 21 days for each period including 7 days for adaptation were conducted in the present study.The results showed that the average daily milk yield was not significant difference among 4 groups(P>0.05),but 0.78% Ca(DM base) treatment had biggest milk yields,with 5.4%,5.5% and 3.9% higher than the 0.47,0.62 and 0.93% Ca(DM base),respectively.The milk content was non-significant differences among different calcium content diet treatment.In addition,the blood plasma contents of calcium were significant differences among different dietary calcium contents(P<0.05).Blood Parathyroid hormone and 1,25-(OH)2 Vit D decreased significantly with the diet calcium content increase(P<0.05).Therefore,the 0.78% Ca(DM base) for the water buffalo diets can increase the milk production.