Xia W G, Zhang H X, Lin Y C, Zheng C T
Institute of Animal Science, Guangdong Academy of Agricultural Science, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, P. R. China.
Institute of Animal Science, Guangdong Academy of Agricultural Science, Key Laboratory of Animal Nutrition and Feed Science (South China) of Ministry of Agriculture, State Key Laboratory of Livestock and Poultry Breeding, Guangdong Public Laboratory of Animal Breeding and Nutrition, Guangdong Key Laboratory of Animal Breeding and Nutrition, Guangzhou 510640, P. R. China
Poult Sci. 2015 Dec;94(12):2932-7. doi: 10.3382/ps/pev281. Epub 2015 Oct 13.
To establish the dietary Ca requirements for laying ducks during their peak laying period, 5 Ca levels (2.8, 3.2, 3.6, 4.0, and 4.4%) were used, and laying performance, eggshell quality, serum variables, and bone quality were examined. A total of 1,620 Longyan shelducks with similar BW at 20 wk of age were fed for 13 wk in 5 treatment groups, each with 4 replicates of 81 birds. Dietary Ca increased egg production and egg mass (linear, P<0.01) and reduced the feed conversion ratio (FCR), but egg weight was not affected. Dietary Ca level did not affect eggshell properties or any reproductive organ index except for shell weight (highest with the 4.0% Ca diet, P<0.05). Serum concentrations of Ca and calcitonin increased with dietary Ca level (linear, P<0.01), and a quadratic response (P<0.01) was seen in alkaline phosphatase activity; the highest values were in ducks fed the 3.6% Ca diet. Tibial fresh weight was affected by dietary Ca (linear and quadratic, P<0.05) with tibiae from the 2.8% Ca ducks weighing less than those from ducks fed any other Ca level. Other tibial measurements were unaffected by dietary Ca. According to the regression model, the Ca levels required for laying Longyan shelducks during their peak laying period are 3.4 and 3.2% for maximal serum alkaline phosphatase activity and tibial fresh weight, respectively. The results showed that diets containing 3.2 to 3.6% Ca provide for superior productive performance and bone quality in laying Longyan shelducks during their peak laying period.
为确定产蛋高峰期蛋鸭的日粮钙需求，采用了5种钙水平（2.8%、3.2%、3.6%、4.0%和4.4%），并对产蛋性能、蛋壳质量、血清指标和骨骼质量进行了检测。选取1620只20周龄体重相近的龙岩麻鸭，分为5个处理组，每组4个重复，每个重复81只，饲养13周。日粮钙水平提高了产蛋量和产蛋总重（呈线性关系，P<0.01），并降低了料蛋比，但蛋重不受影响。日粮钙水平对蛋壳特性或任何生殖器官指数均无影响，但对蛋壳重量有影响（4.0%钙日粮组最高，P<0.05）。血清钙和降钙素浓度随日粮钙水平升高而增加（呈线性关系，P<0.01），碱性磷酸酶活性呈二次反应（P<0.01）；日粮钙水平为3.6%的鸭血清碱性磷酸酶活性最高。日粮钙水平对胫部鲜重有影响（呈线性和二次关系，P<0.05），日粮钙水平为2.8%的鸭胫部重量低于其他钙水平组。日粮钙水平对胫部的其他指标无影响。根据回归模型，产蛋高峰期龙岩麻鸭血清碱性磷酸酶活性和胫部鲜重达到最大值时所需的钙水平分别为3.4%和3.2%。结果表明，日粮钙水平为3.2%至3.6%时，产蛋高峰期龙岩麻鸭蛋鸭的生产性能和骨骼质量最佳。
