饲用微生物添加剂育肥杂种肉羊效果的试验

为比较青贮玉米秸秆添加与不添加饲用微生物添加剂的效果,进行了饲用微生物添加剂青贮玉米秸秆饲喂陶赛特×小尾寒羊F1代杂种肉羊育肥效果的试验。结果表明,用饲用微生物添加剂制作青贮玉米秸秆饲喂3～6月龄杂种肉羊,全期只均日增重达230．56g,较青贮玉米秸秆对照组提高7．44％．试验组只均盈利253．5元．盈利提高29．60％,经济效益显著。饲用微生物添加剂适宜在杂种肉羊生产上推广应用。     

牦牛犊牛全哺乳及育肥试验

根据月龄相近的原则选择60头牦牛犊牛进行全哺乳及育肥试验,研究全哺乳对牦牛犊牛生产发育的影响。结果表明,全哺乳不但能提高牦牛犊牛的体重,而且能提高养殖者的经济效益。     

盘江黄牛及其杂交牛育肥中干物质、粗蛋白、综合净能需要研究

将３６ 头盘江黄牛及其杂交牛分成１２ 组，采用不同的日粮，进行两期育肥试验，得到不同的增重水平和实际营养物质摄入量。用各组实际采食的干物质（ ＤＭ） 、粗蛋白（ＣＰ） 、综合净能（ＮＥｍｆ） 与我国试行的《肉牛饲养标准》进行比较。结果表明，除干物质与标准相差较多（ － ６ ．３ ％ ） 外，粗蛋白和综合净能与标准相当接近（ 仅相差－ １ ．５ ％ 和２ ．８ ％ ） ，说明盘江黄牛及其杂交牛在育肥中的营养需要基本与标准相符，在配制日粮时，可以参考我国的《肉牛饲养标准》。     

Effect of Different Dietary Nutrition Levels on Fattening Effect of Holstein Bulls

This experiment was conducted to study the effect of different dietary nutrition levels on fattening effect of Holstein bulls.48 4-month-old Holstein bulls with an average body weight of 128 kg were allocated into two groups,group Ⅰ was fed a low nutrition level diet,group Ⅱ was fed a high nutrition level diet.Each group had 24 Holstein bulls.The pre-test period lasted for 7 days and the trial period lasted for 245 days.The results showed that compared with group Ⅰ,the ADG in group Ⅱ was significantly increased by 6.36% (P<0.01),while the F/G in group Ⅱ was decreased by 6.55%.With the increasing of dietary nutrition levels,the apparent digestibility of CP,EE,NDF,ADF,Ca and P were rising,but there was no significant differences between two groups (P>0.05).Compared with group Ⅰ,the serum GLU,AST,ALT and GH contents in group Ⅱ were increased by 12.52%,12.85%,9.68% and 13.24% (P<0.05),respectively,while the serum BUN content in group Ⅱ was decreased by 10.98% (P<0.05).Compared with group Ⅰ,the feeding profits of group Ⅱ increased by 1.37 yuan/(head·day),the total economic benefit of group Ⅱ increased by 335.65 yuan/head.In conclusion,the improvement of dietary nutrition levels could improve the fattening performance and the economic benefit of Holstein bulls.     

饲料突然变换对配套系生猪肥育性能影响的研究

选择配套系生猪为研究对象,研究饲料突然变换对配套系生猪育肥性能的影响。虽然配套系生猪的生长速度快、饲料利用率高、瘦肉率高、饲养时间短,但其适应能力、耐粗饲能力、抗应激能力却很差,因此,必须在科学的饲养管理条件下才能取得良好的饲养效果。否则易发生"PSS"(应激综合征)、"PSE"(肉色苍白/蛋白质松软无弹性、切面渗水的劣质肉),给养殖户造成重大损失。     

Effect of Different Crossbred Combinations on Fatting Performance in Beef Cattle

This study was aimed to determine the effects of different crossbred combinations on fatting performance in beef cattle. Using single factor randomized block design, 30 bulls (health, similar weight and age) were chosen, Simmental cattle×Kerqin beef cattle (group A), Charolais cattle×Kerqin crossbred beef cattle (group B) and Kerqin beef cattle (group C) were divided into three groups with 10 bulls per group. After 95 d, the body weight, slaughter performance, meat quality and the economic benefits of fattening were measured. The results showed that there were no significant influence on dry matter intake among trials (P>0.05). The F/G, ethanolic extract (EE) of muscle in crossbred groups (groups A and B) were significant lower than group C (P<0.05). The weight of carcass, weight of meat, rate of carcass, and the weight of shank, plate, chine and rump in crossbred groups were significant higher than group C (P<0.05). There were no significant difference in content of amino acids among groups (P>0.05),and it had difference in the content of palmitoleic acid (PAA),stearic acid(SA) and linoleic acid (LA). In this trial, it had better fattening performance and the economic benefits in crossbred cattle groups than Kerqin beef group cattle, but the ethanolic extract and unsaturated fatty acids of muscle in Kerqin beef cattle were higher than the crossbred groups, and it had better fattening performance by crossbred.     

微贮秸秆与秸秆育肥羊只的比较试验

秸秆微贮后 ,秸秆发生了质的变化 ,这一变化 ,提高了饲草利用价值和适口性 ,加快了羊只增重。试验将秸秆微贮技术引入景泰 ,通过微贮秸秆和未微贮秸秆育肥羊只进行对比 ,结果表明 ,在 6 0 d育肥期内 ,秸秆微贮料育肥羊平均日增重 4 4 .8g,对照组日增重 7.1g,提高 5.3倍     

生长激素（PST）脂质体对育肥猪生产性能的影响

选择18头体重20kg左右的太湖二元杂交小公猪，分成A、B、C3组，每组6头。A组为对照组；B组颈部肌肉注射生长激素（PST）4ml/头；C组颈部肌肉注射PST脂质体28mg/头；结果表明PST与PST脂质体对育猪的生产性能影响较为接近，与对照组相比，均可显著提高育肥猪的日增重，饲料报酬，改善猪的胴体品质，说明PST脂质体可代替PST用于生产实践。     

高寒牧区藏系绵羊(1岁)冬季暖棚育肥试验

试验结果表明:藏系羔羊日粮中精料比例越高,个体增重、饲料转化率达到最大的时间就越长,曲线的峰值就出现的越晚。各育肥期羔羊个体增重在育肥组之间差异不显著,但同一育肥组羔羊的个体增重在不同育肥期之间差异显著(P<0.05)。3个育肥组和对照组羔羊个体总增重的顺序为:第1组>第3组>第2组>对照,且它们的增重率分别为51.27％、50.08％、48.75％和-8.25％,且3个育肥组羔羊个体增重极显著地高于对照组(P<0.01)。不论从羔羊个体增重,还是从饲料转化率的角度考虑,利用相应的日粮组成育肥1岁羔羊时,第1组、第2组和第3组分别不能少于50d、40d和40d。3个育肥组羔羊个体增重与实际采食量之间均呈显著的正相关关系,且第1、第2和第3组的线性回归方程依次为:Y=0.5951X-4.7596(r=0.8037,P<0.05);Y=0.5456X-6.2214(r=0.8587,P<0.05);Y=0.2418X-6.408(r=0.8474,P<0.05)。当X=7.998kg/10d·只,11.403kg/10d·只和26.502k/10d·只时,第1组、第2组和第3组羔羊的个体增重均为零,即在这种采食量水平下,只能够维持各组羔羊的基础代谢,只有采食量大于这种水平时,羔羊才能进行净生产。     

瘦肉型俄罗斯大白猪的引种利用研究

利用瘦肉型俄罗斯大白猪（以下简称新型苏白猪），改造兼用型苏联大白猪（以下简称旧型苏白猪），提高其瘦肉率，转变其经济类型，以适应土默特左旗列为全国“瘦肉型商品猪生产基地旗”建设的需要。试验结果表明，新型苏白猪改造旧型苏白猪其一代后裔的肥育性能、屠体品质、肉脂品质等各项指标均较理想，效果显著，所以，新型苏白猪必将成为该旗“基地”建设的主要猪种。