不同饲养条件对青年新疆褐牛日增重及血清生化指标的影响

试验旨在研究不同饲养条件对青年新疆褐牛生长过程中不同时期日增重与血清生化指标水平变化的影响。选用16月龄左右的青年新疆褐牛68头，分为散栏组和栓系组。分别于2012年10、11、12月及2013年1和2月测定青年牛体重，并采集血样进行白蛋白（albumin，ALB）、球蛋白（globulin，GLB）、总蛋白（total protein，TP）、尿素氮（blood urea nitrogen，BUN）、谷草转氨酶（glutamic-oxaloacetic transaminase，GOT）、谷丙转氨酶（glutamic-pyruvic transaminase，GPT）含量的检测。结果表明，散栏组日增重在2012年12月及2013年1和2月极显著高于栓系组（P＜0.01），血清白蛋白含量在2013年1月极显著高于栓系组（P＜0.01），球蛋白含量在2012年10、11、12月显著高于栓系组（P<0.01,P＜0.05），总蛋白含量在2012年12月及2013年1和2月显著高于栓系组（P<0.01,P＜0.05），尿素氮含量在2012年10、11月极显著高于栓系组(P＜0.01)，谷草转氨酶含量在2012年11、12月及2013年1月显著高于栓系组(P<0.01,P＜0.05)，谷丙转氨酶含量在2013年1和2月显著高于栓系组(P＜0.05)。综上所述，自由采食散栏饲养方式较栓系饲养能显著提高青年新疆褐牛日增重，同时还能加快其消化代谢，且饲草料提供的各种营养素能有效地被机体吸收合成自身蛋白。

Effect of Different Feeding Conditions on Daily Gain and Serum Biochemical Indexes in Youth Xinjiang Brown Cattle

The experiment was aimed to study the effect of different feeding conditions on the changes of daily gain and serum biochemical indexes level in different period of growing youth Xinjiang Brown cattle in growth process.Selected 68 16-months-old Xinjiang Brown cattle，and divided them into scattered group and tethered group.In the experiment，we measured daily gain and tested blood samples contents of albumin （ALB），globulin （GLB），total protein （TP），blood urea nitrogen （BUN），glutamic-oxaloacetic transaminase （GOT） and glutamic-pyruvic transaminase （GPT） in October，November and December 2012，and January，February 2013.The results showed that the scattered group daily gain was extremely significantly higher than that of tethered group in December 2012，January and February 2013 (P＜0.01).The serum content of ALB in scattered group was extremely significantly higher than that of tethered group in January 2013 (P＜0.01).The serum content of GLB in scattered group was significantly higher than that of tethered group in October，November and December 2012 （P<0.01, P＜0.05）.The serum content of TP in scattered group was significantly higher than that of tethered group in December 2012, January and February 2013 （P<0.01, P＜0.05）.The serum content of BUN in scattered group was extremely significantly higher than that of tethered group in October and November 2012 （P＜0.01）.The serum content of GOT in scattered group was significantly higher than that of tethered group in November，December 2012 and January 2013 （P<0.01, P＜0.05）.The serum content of GTP in scattered group was significantly higher than that of tethered group in January and February 2013 （P＜0.05）. In conclusion，under different feeding mode to fattening youth cattle，compared with tethered feeding mode，ad libitum scattered feeding mode could significantly improve the youth cattle’s daily gain，and also accelerate the digestion and metabolism，and various nutrients that forage provided can effectively be absorbed by the body and the protein synthesis.