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Effect of stocking rate on pasture and sheep production in winter and spring lambing systems

机译:冬季和春季羔羊放牧率对牧场和绵羊生产的影响

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A 2-year study was conducted to quantify the effect of stocking rate on pasture and sheep production in winter and spring lambing systems. Pastures were set-stocked with ewes and their winter-born single lambs at low (20 ewes + lamb ha?1), medium (28 ewes + lamb ha?1), and high (36 ewes + lamb ha?1) stocking rates in spring 2012 and by ewes and their spring-born lambs at low (16 ewes + lamb ha?1), medium (24 ewes + lamb ha?1), and high (32 ewes + lamb ha?1) stocking rates in spring 2013. Annual pasture dry matter production ranged from 8.9 to 10.2 t ha?1 but was not affected by the spring stocking rates. The average live weight gains of the winter-born lambs were 73 and 10 g head?1 day?1 for low and medium stocking rates, respectively, while the lambs at the high stocking rate lost 10 g head?1 day?1 in spring 2012. The spring-born lambs grew at 245, 189, and 133 g head?1 day?1 for low, medium, and high stocking rates, respectively, in spring 2013. High stocking rates did not have any negative effects on the pasture production or botanical composition but they resulted in poor sheep performance, particularly in the winter lambing system.
机译:进行了为期2年的研究,以量化冬季和春季羔羊系统中放牧率对牧场和绵羊生产的影响。牧场放养着母羊及其冬季出生的单羔羊,低(20头母羊+ ha ?1 ),中(28头母羊+ ha ?1 ) ,以及2012年春季高(36头母羊+羔羊ha ?1 )的放养率以及母羊及其春季羔羊的放养率低(16头母羊+羔羊ha ?1 ) ),2013年春季的中型(24母羊+羔羊ha ?1 )和高(32头母羊+羔羊ha ?1 )的放养率。每年牧场干物质产量不等从8.9到10.2 t ha ?1 ,但不受春季放养率的影响。低和中放养率的冬季出生羔羊的平均活体重增加分别为73和10 g head?1天?1,而高放养率的羔羊损失了10 g head ?1 day ?1 在2012年春季。春季出生的羔羊生长了245、189和133 g头?1 day ?1 分别表示2013年春季的低,中和高放养率。高放养率对牧草产量或植物组成没有任何负面影响,但它们导致绵羊性能差,特别是在冬季羔羊系统中。

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