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1.
奶牛泌乳盛期补饲碘的效果   总被引:1,自引:0,他引:1  
选用15头泌乳盛期荷斯坦牛,采用对比试验研究日粮中添加碘对奶牛产奶量的影响,结果是:补饲K115和25mg/头.日组的日平均奶量分别比对照组高3.49千克(P<0.05)和2.76千克(P<0.05)。两个试验组之间日平均奶量无显著差异(P>0.05)。三个组牛血清中T4和T3浓度无明显差异。  相似文献   

2.
奶牛氨基浓缩料的研究和应用   总被引:1,自引:0,他引:1  
对糊化淀粉尿素中尿素的分解速度和氨基浓缩料代替饼类饲喂泌乳牛效果的研究表明,糊化淀粉尿素的分解速度显著减慢(P<0.01),其高峰期NH_3-N浓度只有尿素的59%。用糊化淀粉尿素配制的氨基浓缩料,含粗蛋白质72%。用8%的氨基浓缩料代替15%的饼类饲喂泌乳牛,使产奶量提高16.4%(P<0.05),乳脂率和牛奶比重无显著变化(P>0.05),浓缩料日粮能使泌乳曲线高峰期维持较长时间。在奶牛日粮中用8%的氨基浓缩料替代15%的饼类,降低了成本,提高了产奶量。  相似文献   

3.
奶牛日粮中添加硫酸钠对产奶量的影响   总被引:2,自引:0,他引:2  
选择8头处于泌乳中期的荷斯坦泌乳牛,采用配对分组法,分为对照组和试验组,每组4头,对照组饲喂基础日粮,试验组在基础日粮中添加占精料量0.8%的硫酸钠,经40天的试验,结果表明:试验组比对照组头均每天多产奶1.07kg,产奶量提高 7.1%,差异显著(P<0.05)。试验期内试验组比对照组牛头均每天增收 1.51元。  相似文献   

4.
几丁聚糖防治奶牛隐性乳腺炎试验   总被引:2,自引:1,他引:1  
用SMT检验法对南京钟山奶牛场140头成母牛进行隐性乳腺炎检测。选择阳性母牛40头作为供试牛,共分成4组,每组均10头,进行为期1周试验,然后用t检验对各组试验前后进行比较。结果表明:Ⅰ组(试验组),即饲喂几丁聚糖15g/头日,差异极显著(P<001);Ⅱ组(乳头药浴),差异不显著(P>005);Ⅲ组(肌注左旋咪唑),差异显著(P<005);Ⅳ组(空白),差异不显著(P>005)。  相似文献   

5.
热应激对奶牛血液生化指标及生产性能的影响   总被引:4,自引:0,他引:4  
用72头荷斯坦奶牛研究了夏季热应激对血液生化指标及泌乳性能的影响。结果表明:热应激期奶牛血清中γ-球蛋白含量较非热应激期的冬、春、秋季分别降低39.51%(P<0.01),35.81%(P<0.01)和16.48%(P>0.05);热应激期奶牛血清中抗坏血酸含量较冬、春、秋季分别降低26.03%(P<0.01)、13.35%(P<0.05)和15.01%(P<0.05);热应激期奶牛血清钙、钾、钠含量显著降低(P<0.01),但对血清镁含量无显著影响(P>0.05);热应激期奶牛各泌乳阶段泌乳量均显著低于非热应激期(P<0.01),泌乳前期奶牛对热应激的反应较泌乳中、后期奶牛敏感,产奶量下降幅度较大。  相似文献   

6.
在奶牛泌乳前期日粮中添加复合缓冲剂,研究缓冲剂对泌乳牛血液活性T淋巴细胞及血清蛋白的影响,结果表明:在奶牛泌乳前期添加缓冲剂,可使血液中具有免疫功能的活性T淋巴细胞从71.75±5.63%提高到78.75±6.79%,试验结束时试验组显著高于对照组(P<0.05);γ球蛋白,试验组从28.08±3.53%提高到34.23±6.87%,试验结束时试验组高于对照组,但差异不显著(P>0.05)。  相似文献   

7.
脲酶抑制剂饲喂泌乳牛的效果   总被引:2,自引:0,他引:2  
旨在探讨饲喂脲酶抑制剂对泌乳牛生产性能的影响。结果表明,每头每日添加饲喂脲酶抑制剂预混料100g的试验组,泌乳牛平均日产标准乳22.76kg;未添加的对照组,泌乳个平均日产标准乳21.19kg。试验组比对照组提高产奶量7.4%,经t检验, 2组差异显著( P<0.05)。试验期间,试验组比对照组每天增加盈利1.42元,效益显著。  相似文献   

8.
奶牛日粮中添加奶牛增产剂的试验   总被引:1,自引:0,他引:1  
利用奶牛增产剂饲喂日产16 kg 的泌乳后期奶牛。结果表明:每天每头饲喂0.5 kg,可提高产奶量1.81 kg/d·头,净增幅度为12 %(P>0 .05) 。每头每天饲喂0.6 kg,可提高产奶量3.59 kg/d·头,净增奶幅度为25.6 % ,差异显著( P<0 .05) 。  相似文献   

9.
外源性金属硫蛋白对奶牛泌乳性能和抗氧化状况的影响   总被引:3,自引:2,他引:1  
 选取24头中国荷斯坦奶牛经产泌乳母牛,随机等分为A、B、C、D 四组,分别每头静脉注射经生理盐水溶解的Zn-MT0 (对照),4.0,8.0和12.0mg,以探讨外源性金属硫蛋白(MT)对奶牛泌乳性能和血清抗氧化状况的影响。结果表明,C 和D 组的4%标准乳产量均显著高于对照组(P<0.05),但各组间的乳脂率无显著差异(P>0.05)。B、C 和D 组血清谷胱甘肽过氧化物酶(GSH Px)活性均显著高于对照组(P<0.05)。D 组血清过氧化氢酶(CAT)活性分别显著高于B组(P<0.05)和对照组(P<0.01);C 组血清CAT 活性也显著高于对照组(P<0.05)。C 和D组总抗氧化能力(T-AOC)分别显著高于对照组和B组(P<0.05)。B、C 和D 组血清丙二醛(MDA)含量均显著低于对照组(P<0.05)。说明MT 不失为一种能够有效调控奶牛泌乳量和抗氧化能力的生理活性物质和高效抗氧化剂。  相似文献   

10.
将6头经产不孕无奶母牛分2组,另3头未配种处女牛为1组,进行包埋剂诱导泌乳试验,并国这两种牛各设一对照组进行针剂诱导泌乳,结果表明:各试验组第1泌乳月日均产奶都在1kg以上,诱乳有效率为100%,而全泌乳期产奶量,除2头牛有意外情况外,日均产奶都在上3kg以上,诱乳成功率为100%各试验组和对照组牛产奶量地显著差异(P〉0.05),尤其是处女牛在配种前诱乳,抢一个泌乳期并不影响配种受胎,用包埋剂诱  相似文献   

11.
在北京市某奶牛场,对1986年以来疑似存在的伪牛痘病毒感染情况进行了调查。在临床调查的基础上,应用光镜和电镜技术对患病乳头的丘疹进行了病理组织学和病原学检查。丘疹的病理组织学变化符合痘病毒感染的特征。试验证明,该牛场系为伪牛痘病毒感染  相似文献   

12.
MASTITIS IN SLAUGHTERED DAIRY COWS   总被引:1,自引:0,他引:1  
  相似文献   

13.
FACIAL FIBROSARCOMA IN TWO COWS   总被引:1,自引:0,他引:1  
Fibrosarcoma is a common tumor affecting bone, but is uncommon in cows, Reported here are two bovine cases of facial fibrosarcoma that were very invasive.  相似文献   

14.
A total of 7495 postpuberal beef cows from herds in north Queensland and the Northern Territory were examined at abattoirs to define the extent of wastage due to the slaughter of pregnant cows. On the basis of examination of teeth most cows (57%) were considered mature (approximately 3.5 to 7 years) at slaughter; 14% were young (9 months to 3.5 years) and 29% were old (over 7 years). In herds where pregnancy diagnosis by rectal examination had not been used at time of culling, 71.6% of slaughtered cows were pregnant and 42% of these cows were in the second trimester. This high pregnancy rate was considered an important source of herd wastage. Pregnancy rate varied little with season, but the highest percentages of cows pregnant in the first and third trimesters were recorded in autumn and spring, respectively. Most cows found non-pregnant had active ovaries at time of slaughter. Anoestrus was observed to be most common in winter and in old cows. Lactational status was not recorded. Mean cold carcase weight of 4229 cows was 161 +/- 40 kg. Maximum carcase weight was observed in cows slaughtered at 4 to 6 years of age; old cows had the lowest carcase weight (147 +/- 31 kg) of the age groups considered. Highest (170 +/- 43 kg) and lowest (135 +/- 41 kg) carcase weights in relation to pregnancy or ovarian status were observed in non-pregnant/ovary-active and non-pregnant/anoestrus cows respectively. Carcase weight of cows in the third trimester (165 +/- 35 kg) was greater than in the second (161 +/- 35 kg) or first (157 +/- 36 kg) trimesters; difference between the first and third trimesters was significant (P less than 0.01).  相似文献   

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16.
乳牛骨软症的调查研究   总被引:4,自引:1,他引:3  
本文对哈尔滨奶牛场发生的以异嗜、跛行等为特征的乳牛疾病进行了调查研究,分析研究了日粮成分,临床表现,血清钙、无机磷、镁和羟脯氨酸的含量及变化,以及尾椎密度的测定值。结果表明,日粮中钙过多,磷、镁供给不足,钙、磷比例过大是致病的主要原因。并分析研究了乳牛血液生化指标的变化和尾椎骨密度的测定法对诊断和监测骨软症和钙、磷、镁代谢动态的意义。  相似文献   

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18.
CHRONIC COPPER POISONING IN DAIRY COWS   总被引:2,自引:0,他引:2  
SUMMARY Chronic copper poisoning in a dairy herd fed supplementary copper is recorded. Most cows received 11 g of copper sulphate per day but high milk producers received 22,0 g and within 6 months, 3 of them became ill and died. The signs shown by the 3 cows were anorexia, decreased milk production, frequent recumbency and jaundice. Within 4 days of showing signs, the cows died. The autopsy findings were dehydration, anaemia, jaundice, liver damage and intestinal haemorrhage. Liver copper values varied from 1,250 to 2,410 ppm DM.  相似文献   

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