35～50kg道赛特×小尾寒羊杂交公羔矿物质需要量研究

本试验旨在研究35~50 kg道赛特×小尾寒羊杂交公羔钙、磷、钾、钠、镁的维持需要量和净生长需要量。选取(34.54±0.40)kg、6月龄道赛特×小尾寒羊杂交公羔25只分为5组,初期组,中期组,末期100%组、末期60%组、末期40%组(饲喂水平分别为100%、60%、40%),初期组、中期组、末期组分别在羔羊体重为35、43和50 kg时屠宰。测定动物体组织中的钙、磷、钾、钠、镁含量,建立数学模型对矿物质的维持需要量和净生长需要量进行预测。结果显示:道寒杂交公羔在35~50 kg体重阶段,钙、磷、钾、钠、镁的维持需要量分别为0.73、0.72、0.32、0.32、0.13 g/d,基于空腹体重(EBW)的净生长需要量分别为13.47~14.00 g/kg EBW、7.18~7.41 g/kg EBW、0.13~0.17 g/kg EBW、1.20~1.73 g/kg EBW、0.45~0.58 g/kg EBW。本研究得出了35~50 kg道赛特×小尾寒羊杂交公羔矿物质维持需要量和净生长需要量的模型。

Mineral Requirements for Dorset ×Thin-Tailed Han Crossbred Male Lambs at 35 to 50 kg

This study was conducted to estimate maintenance requirements and net growth requirements of cal-cium ( Ca) , phosphorus ( P) , potassium ( K) , sodium ( Na) and magnesium ( Mg) for Dorset×Thin-Tailed Han crossbred male lambs during 35 to 50 kg of body weight.Twenty-five 6-month-old Dorset ×Thin-Tailed Han crossbred male lambs weighted (34.54±0.40) kg were randomly divided into 5 groups, which were base-line group, intermediate group, and last group 100%, last group 60%and last group 40%( feeding levels were 100%, 60%and 40%, respectively) .baseline, intermediate and last groups were slaughtered at 35, 43 and 50 kg, respectively, to determine the contents of Ca, P, K, Na and Mg in animal tissues, and to establish the mathematical models for predicting maintenance requirements and net growth requirements.The results showed that during 35 to 50 kg of body weight, maintenance requirements for Dorset×Thin-Tailed Han cross-bred male lambs were 0.73, 0.72, 0.32, 0.32 and 0.13 g/d, respectively, and net growth requirements were 13.47 to 14.00 g/kg EBW, 7.18 to 7.41 g/kg EBW, 0.13 to 0.17 g/kg EBW, 1.20 to 1.73 g/kg EBW and 0.45 to 0.58 g/kg EBW, respectively.The study proposes models of mineral requirements for Dorset ×Thin-Tailed Han crossbred male lambs during 35 to 50 kg of body weight.