棉花秸秆作为绵羊粗饲料的研究

将18只平均体重为38．6kg的罗姆尼为父本、军垦型细毛羊为母本的杂交一代公羊分为三组，测定在补饲350g精料的情况下绵羊限饲粉碎棉花秸秆(试验1组)、自由采食粉碎棉花秸秆(试验2组)和自由采食玉米青贮(试验3组)时的采食量和消化率，以研究比较绵羊对粉碎棉花秸秆的利用性。结果表明，粉碎棉花秸秆作为粗饲料，可被绵羊采食和利用。绵羊对棉花秸秆的自由采食量达693g／d／羊，其干物质、有机物、粗蛋白、纤维素和半纤维素的消化率分别为34．6％，39、7％．43，0％，5％和65．8％。纤维素消化率低，是棉花秸秆消化利用中需研究的问题之一。在本试验条件下，根据推算，绵羊每采食4.3kg棉花秆可增加1kg体重．因此．可以考虑在生产中较大范围地使用粉碎棉花秸秆饲喂牛羊。

Study on cotton stalk for sheep as roughage

To evaluate the nutritive value of the cotton stalk, the dry matter intake (DMI) and the nutrient digestibility of the cotton stalk were determined in this experiment. 18 crossing mature wethers (Romney x Chinese Merino) with average body weight of 38.6 kg were divided into 3 groups. Supplemented with 350g of concentrate for each group, the sheep in the group 1 and group 2 were fed limited and ad libitum by the cotton stalk respectively, and the sheep in the group 3 was designed to eat the corn silage ad libitum. The results showed that the cotton stalk could be eaten and utilized by sheep as roughage. The DMI of the cotton stalk was 693g/d /sheep, and the digestibility of DM, OM, CP, cellulose and semi - cellulose in the cotton stalk were 34.6% , 39. 7% , 43.0% , 5% and 65.8% respectively. The lower digestibility of cellulose was one of the problems constraining the utilization of cotton stalk for animal and needed to be studied further. According to the proximate calculation, the sheep would increase live - body weight by 1 kg if 4. 3 kg of cotton stalk consumed in this experimental condition. Therefore, it is worthy of considering that the cotton stalk can be used for ruminants by a larger scale in the practical production.