本试验旨在研究饲粮钙水平对猪生长性能、胫骨性能及血清生化指标的影响,探讨30~60 kg生长猪的适宜钙需要量。试验采用单因子完全随机试验设计,将30头初重(34.2±2.1) kg的"杜×长×大"生长猪随机分为5个组,每组6个重复,每个重复1头猪。各组分别饲喂钙水平为0.45%(对照组)、0.50%、0.55%、0.60%和0.65%的玉米-豆粕型试验饲粮。预试期5 d,正试期28 d。结果表明:1)饲粮钙水平对料重比影响不显著(P>0.05)。0.55%、0.60%钙水平组平均日采食量显著高于对照组(P0.05)。0.55%、0.60%、0.65%钙水平组脱脂胫骨灰分含量显著高于对照组(P0.05),0.45%、0.50%和0.65%钙水平组血清碱性磷酸酶活性显著高于0.55%和0.60%钙水平组(P<0.05)。综上所述,饲粮钙水平为0.55%时,30~60 kg生长猪获得较好的生长性能;饲粮钙水平为0.60%时,30~60 kg生长猪获得较好的胫骨性能。
This experiment was to conducted to study the effects of dietary calcium level on growth performance, tibia performance and serum biochemical indices of pigs, and to explore the optimal calcium level in the diet of growing pigs weighting 30 to 60 kg. A single factorial randomized design was adopted, and thirty crossed pigs (Duroc譒andrace譟orkshire) with an average body weight of (34.2?2.1) kg were randomly allotted into 5 groups with 6 replicates per group and 1 pig per replicate. Pigs were fed corn-soybean experimental diets supplemented with 0.45% (control group), 0.50%, 0.55%, 0.60% and 0.65% calcium, respectively. The adjustment period lasted for 5 days, and the experimental period lasted for 28 days. The results showed as follows: 1) feed/gain was not affected by dietary calcium level (P>0.05), the average daily feed intake in 0.55% and 0.60% groups was significantly higher than that in control group (P0.05), the ash content of defatted tibia in 0.55%, 0.60% and 0.65% groups was significantly higher than that in control group (P0.05), but the serum alkaline phosphatase activity in 0.45%, 0.50% and 0.65% groups was significantly higher than that in 0.55% and 0.60% groups (P<0.05). In conclusion, based on growth performance and tibia performance, the optimal calcium requirements of growing pigs weighting 30 to 60 kg are 0.55% and 0.60%, respectively.
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