日粮蛋白质水平对不同品种山羊氮平衡和生产性能影响  

Effects of Dietary Protein Levels on Nitrogen Retention and Performance of Angora and Cashmere Goats

作　　者：贾志海[1] 安民[1] T.Sahlu T.H.Teh 

机构地区：[1]中国农业大学动物科技学院,北京100094 [2]LangstonUniversity,U.S.A.

出　　处：《中国农业大学学报》1996年第3期99-104,共6页Journal of China Agricultural University

摘　　要：两种蛋白质水平日粮（分别为9％和16％）对16只山羊（8只绒山羊和8只安哥拉山羊）进行6周饲养试验和氮平衡试验。结果表明，干物质采食量和营养物质消化率两品种山羊相似，氮的存留及血液生化指标两品种间也无显著差异。山羊采食16％蛋白质水平日粮，干物质采食量和体重增长显著高于采食9％蛋白质水平日粮，氮的存留也显著增加（P＜0．01）；血液中生化指标除尿氮显著增加（P＜0．01），T3和T4含量减少（P＜0．01和P＜0．05）外，其他生化指标不同蛋白质水平日粮无显著差异。采食16％蛋白质水平日粮，安哥拉山羊马海毛纤维产量提高31．1％（P＜0．05）。随毛纤维产量增加，毛纤维长度和细度发生变化（P＜0．05）；绒山羊毛纤维总重、绒毛长度和细度不受日粮蛋白质水平影响，山羊绒生长不同于马海毛。Effect of dietary crude protein level on fiber production of Angora and Cashmere goats in 16 yearling doelings (8 Angora, 8 Cashmere) for 6 weeks. Goats were housed in individual stalls and maintained at constant temperature (21℃) and with 9 h light each day. Goats were initially sheared,blocked and assigned to one of two dietary treatments (9% or 16% CP)in a 2X2 factorial design. Diets were isocaloric (2. 9 Mcal, DE/kg, DM)and were fed ad libitum. The results indicated that DM intake and digestibility were similar for two breess, nitrogen retention and blood biochemistry parameter were not af fected by breeds, but daily DM intake and BW gain were greater (P＜0.01)for 16% CP diet compared to 9% in both types of goats. Nitrogen retention was also increased (P＜0.01) with dietary for both types of goats. Urea-N was increased (P＜0.01)by high protein whereas T3 and T4 were reduces by CP (P＜ 0.05). Clean mohair fleece weight of Angora was increased 31. 3 % (P＜0.05) and staple length and diam eter of mohair were also increased. However, total fleece weight, down yield, cashmere fiber length and diameter were not affected (P＞0.05) by diet CP level for cashmere goats.

关 键 词：粗蛋白质 马海毛 山羊绒 氮平衡 血液生化指标 

分 类 号：S827.5[农业科学—畜牧学]