高蛋白料精等量替代鱼粉饲喂肥育猪对比试验

应用高蛋白料精等量替代鱼粉饲喂肥育猪 ,其结果在 42d试验期内高蛋白料精组头均增重 19.0 6kg ,比鱼粉组多增重 2 .12kg ,增重率提高 12 .5 2 %,头均多增收益 2 1.2 1元 ,差异显著 (P <0 .0 5 )。     

Effects of species and sex on plasma hormone and metabolite concentrations in crossbred Brahman cattle and crossbred water buffalo

Buffalo meat is tasty and indistinguishable from beef, and has been described as being lean and low in cholesterol in comparison with beef. However, little is known about the plasma hormone and metabolic profiles related to fat metabolism in buffalo, and how their levels are affected by species and sex. In this study levels of plasma hormones and metabolites were compared between species and sexes. Ten growing crossbred Brahman cattle and ten growing crossbred buffaloes (five males and five females in each), with an average age of 22 months were used. The animals were fed on an experimental diet composed of corn silage, brewer's spent grain and a concentrate mixture at a 50:30:20 ratio on a dry matter basis during a fattening period of 6 months. Blood samples were collected every month during the experiment, and were analysed for plasma leptin, insulin, glucose, triglyceride (TG) and total cholesterol (TC) concentrations. Plasma leptin, insulin and TC concentrations increased during fattening and were significantly (P < 0.05) higher in cattle than in buffaloes. These concentrations in cattle showed a big difference between sexes in comparison with buffaloes, and were higher in females than in males. The plasma glucose and TG concentrations did not differ (P > 0.05) between cattle and buffaloes.

The crude fat content of longissimus muscle was significantly higher in cattle than in buffalo. Differences in body fat deposition seem to have an influence on plasma leptin, insulin and TC concentrations differently between cattle and buffaloes.     

肉牛补饲糖蜜舔砖的短期育肥效果研究

通过对内牛饲喂与不喂糖蜜舔砖的效果进行对比分析。对照组头均增重103．3g，试验组头均增重321．1g，比对照组日均增重高出217．8g，提高210％。试验组每kg增重耗用糖蜜舔砖1．38kg，对照组头均获利65．08元，试验组头均获利142．2元，比对照组高出77．12元，提高118．5％。     

安昭牛和昭通牛育肥效果比较研究

为比较安格斯牛和昭通牛的杂交效果,进行了安昭牛F1代和昭通牛的短期育肥研究.结果表明:安昭牛和昭通牛平均日增重、屠宰率、净肉率、眼肌面积分别为1.179 kg、53.72%、45.11%、86.35 cm2和0.849 kg、48.83%、39.84%、55.65 cm2,安昭牛均极显著高于昭通牛(P＜0.01),胴体脂肪覆盖率分别为82.98%和69.98%,安昭牛优于昭通牛(P＜0.05);而安昭牛肉蛋白质含量20.6%,极显著低于昭通牛的23.65%(P＜0.01),脂肪含量26.3%显著高于昭通牛的7.85%(P＜0.05),总氨基酸含量、必需氨基酸含量分别为86.43 mg/100mg、83.06 mg/100mg和38.47 mg/100mg、36.38 mg/100mg,安昭牛亦极显著(P＜0.01)和显著(P＜0.05)高于昭通牛.     

荷斯坦育肥牛饮喂甲醛液的增重效果试验

选用西宁市奶牛场荷斯坦育肥牛 1 6头 ,随机分为试验组和对照组 ,每组为 8头。试验组饮喂 1 50 ppm甲醛液 ,对照组饮自来水。试验期 50天。结果表明 ,试验组和对照组平均增重分别为 51 .0 0千克和 2 8.50千克 ,日增重分别为 1 0 2 0克和 570克 ,差异极显著 (p<0 .0 1 )。     

"牛羊肥"添加剂对秦川公牛育肥效果的影响

利用“牛羊肥”添加剂，在舍饲的条件下，对对秦川公牛的育肥实验表明：实验期实验组的总增重，日增重，胴体重，屠宰率比对照组分别高出41．80kg,464.44g,44.90kg,11.22个百分点（P＜0．01）。试验组的饲料组报酬是对照组的2．04倍。     

甘肃白猪日粮能量浓度与肥育性能及胴体品质关系的研究

本研究以不同日粮能量的浓度为条件,较详细地研究了甘肃白猪肥育性能和胴体品质关系的变化规律.证实甘肃白猪在本试验设置的日粮能量浓度范围内具有调节采食量,获得较高日增重及饲料利用率的能力.综合评定结果显示,甘肃白猪更适应中能日粮.如采用低能日粮饲喂则能获得优良胴体,大幅度提高瘦肉率.在育种上,提高甘肃白猪胴体瘦肉率,应重视对背膘、臀围及全身骨骼发育等方面的选择.     

宁乡猪的肥育与胴体性状的聚类分析

本文应用聚类分析方法将宁乡猪的肥育与嗣体性状分成了三类,第Ⅰ类为平均日增重、宰前活重、胴体长、胴体前宽,第Ⅱ类为屠宰率、膘厚及眼肌面积,第Ⅲ类为瘦肉率、肥肉率、花板油比例。从这三类性状中选出的典型性状分别为宰前活重、屠宰率及肥肉率。这与采用其它方法分析的结论是一致的,因此,聚类分析方法在家畜选种工作中的应用是可行的。     

玉米及其秸秆肥育肉牛效果与经济效益的对比研究

对玉米及其秸秆采用 3种收获处理方式 :全株收获并青贮、基本成熟时收获子实后鲜秸秆及时青贮和完成成熟后收获子实干秸秆作为饲料。根据饲养标准 ,用玉米、鲜酒糟、豆粕等将玉米全株青贮饲料、鲜秆青贮饲料和干玉米秸秆分别配制成标准日粮 ,肥育架子牛 90d。试验结果表明 :日粮消化率、试牛日增重、产肉率及牛肉品质均以全株青贮日粮组为最好 ;养牛效益和每公顷耕地效益也以全株收获方式最好 ,鲜秆青贮次之 ,玉米完全成熟后收获子实干秸秆饲用方式最差。     

埋植Revalor对秦川阉牛肉用性能的作用

 将40头约13月龄的秦川阉牛按体重分为10个单位组，每组4头，其中1头作对照，3头埋植Pevalor，经过89天肥育试验后进行屠宰和肉脂品质测定。结果表明，Revalor显著降低了血清脲氮含量，极显著提高了血清谷草转氨酶活性；使得秦川阉牛日增重和饲料报酬分别提高19.2%和17.8%，增加了胴体瘦肉量，减少了脂肪沉积；提高了胴体蛋白含量，明显改变了脂肪组织的脂肪酸组成，但对肌肉中17种水解氨基酸含量无明显影响。Revalor对秦川阉牛行为有一定的不良影响，使得争斗和爬跨活动频繁，逃跑距离增大，但并不严重，不足以构成饲养管理上的困难。