尼玛县放牧绒山羊采食习性、采食量和消化率研究

Study on Feed Preference,Feed Intake and Nutrients Digestibility of Cashmere Goats in Nima County

此试验采用饱和链烷烃技术研究了2018年西藏那曲市尼玛县放牧绒山羊四季的采食组成、牧草采食量和牧草消化率。结果表明:尼玛县绒山羊春季采食的主要牧草是西藏嵩草(Kobresia tibetica Maxim)、紫花针茅(Stipa purpurea),夏季是二裂委陵菜(Potentilla bifurca Linn)、弱小火绒草(Leontopodium pusillum),秋季是青藏狗娃花(Heteropappus bowerii(Hemsl.)Griers),冬季则是青藏苔草(Carex moorcroftii Falc.Ex Boott)。育成绒山羊春、夏、秋、冬牧草干物质采食量分别为450 g、850 g、950 g、420 g,成年绒山羊分别为685 g、1 280 g、1 350 g、650 g,四季之间差异显著(P<0.05),冬季牧草采食量最低。育成绒山羊春、夏、秋、冬牧草干物质消化率分别为45.85%、56.50%、50.44%、39.05%,成年绒山羊分别为50.50%、60.94%、55.52%、45.76%,四季之间差异显著(P<0.05),冬季牧草消化率最低。

This experiment used saturated paraffin technology to study the feed composition, forage intake and forage digestibility of grazing cashmere goats in four seasons in Nima County, Nagqu, Tibet in 2018. The results showed that the main forages of cashmere goats in the spring were Kobresia tibetica Maxim and Stipa purpurea, Potentilla bi-furca Linn and Leontopodium pusillum in summer, Heteropappus boweri (Hemsl.) Griers) in autumn, and Carex moorcroftii Falc. Ex Boott in winter. The dry matter intake for growing cashmere goats in four seasons was 450 g, 850 g, 950 g and 420 g, respectively, and that for adult cashmere goats were 685 g and 1 280 g, 1 350 g, and 650 g respectively. The difference between the four seasons was significant ( P <0.05), and the forage intake was the lowest in winter. The dry matter digestibility for growing cashmere goats in four seasons was 45.85%, 56.50%, 50.44% and 39.05%, respectively, while that of adult cashmere goats were 50.50%, 60.94%, 55.52% and 45.76% respectively. The difference between the four seasons was significant ( P <0.05), and the digestibility in winter was the lowest.