青海欧拉型妊娠母羊饲粮钙磷适宜水平的研究

Study on the Suitable Dietary Calcium and Phosphorus Level for Qinghai Oula Pregnant Ewes

为研究欧拉型母羊妊娠后期饲料中适宜的钙磷(Ca、P)水平,在青藏高原寒冷牧区粗饲料的条件下,试验选择60只2~3岁的欧拉型妊娠后期母羊,体重为(55.42±2.37)kg,随机分成4个组(每组15只)。根据Ca、P含量的不同,分别为A组(Ca 0.08%、P 0.32%)、B组(Ca 0.18%、P 0.38%)、C组(Ca 0.59%、P 0.60%)、D组(Ca 1.01%、P 0.83%),每个处理组饲喂一种精料。试验预试期10 d,正试期60 d。试验结果显示:随着饲粮中Ca、P水平的逐渐增加,母羊平均日增重(ADG)、排粪量、磷表观消化率、血清Ca等都没有发生明显的变化。同一处理组在各个时间段:血清甲状腺素,B、C两组在第30 d时显著高于第1 d和第60 d(P<0.05);生长激素,A、B两组第1 d显著高于第30 d、第60 d(P<0.05);不同的处理组在同一时间段:血清P,在第30 d和第60 d,C、D两组显著高于A处理组(P<0.05);血清甲状腺素,在第30 d时,A处理组显著低于B、C两组(P<0.05);生长激素,在第30 d和第60 d,C组显著高于A、B、D 3组(P<0.05)。综上所述,对于体重在55 kg左右的欧拉型妊娠后期母羊而言,日粮中适宜Ca、P水平分别为7.5 g/d、4.23 g/d。

In order to study the suitable level of calcium and phosphorus in late gestation diet of Oula type ewes,60 ewes of two to three years old with a body weight of (55.42±2.37) kg were randomly divided into four groups (15 in each group) under the provision of roughage in cold pasturing area of QinghaiTibet Plateau.According to the different level of Ca and P,they were set as group A (Ca 0.08%,P0.32%),group B (Ca 0.18%,P 0.38%),group C (Ca 0.59%,P 0.60%) and group D (Ca 1.01%,P0.83%).The pre-trial period lasted for 10 days and the formal period lasted for 60 days.The results showed that the average daily gain,defecation volume,apparent digestibility of P,serum P and serum Ca of ewes had no significant changes with the dietary Ca and P levels gradually increased.For the same treatment group in each time period,serum thyroxine of the B and C treatment group on the 30th day was higher than that on the 1st and 60th day (P<0.05);the growth hormone in group A at day 1 was higher than that at day 30 and 60 (P<0.05).Comparing different treatment groups in the same time period,serum phosphorus on the 30th and 60th day of the C and D treatment group was higher than that of the A treatment group (P<0.05);serum thyroxine in treatment group A was lower than that in the treatment group B and C on day 30 (P<0.05).On the 30th and 60th day,the growth hormone in group C was higher than that in groups A,B and D (P<0.05).In conclusion,for Oula ewes weighting around 55 kg in late pregnancy,the appropriate dietary calcium and phosphorus levels should be 7.5 g/d and 4.23 g/d,respectively.