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首页> 外文期刊>Tropical Animal Health and Production >Milk yield and reproductive performance of brucellosis-vaccinated but seropositive Holstein cows
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Milk yield and reproductive performance of brucellosis-vaccinated but seropositive Holstein cows

机译：接种布鲁氏菌病但血清反应阳性的荷斯坦奶牛的产奶量和生殖性能

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The aim of this research was to study if seropositivity for brucellosis in vaccinated cows against this disease hampers reproductive performance and milk production in high-yielding Holstein cows. For this purpose 1,026 healthy cows and 372 cows seropositive for brucellosis were enrolled in this study. Cows positive to card test and subsequently to the rivanol test were further subjected to the radial immunodiffusion (RID) test. It was found that only 11 % of the presumably infected cows by brucellosis screening tests were really infected with this disease. The reproductive performance of the group of cows with 11 % Brucella-infected animals was not impaired; overall pregnancy rate did not differ between seropositive and healthy cows (30.9 vs. 29.6 %). The abortion rates were similar between seropositive cows (5.3 %) and seronegative animals (6.9 %). Cows in the herd with 11 % Brucella-infected animals produced significantly more milk than unaffected cows over a 305-day lactation (10,684 +/- 1,720 vs. 10,345 +/- 1,736; mean +/- SD; P < 0.05). It was concluded that in dairy herds vaccinated against brucellosis with both 19 and RB51 strains, supplemental tests such as RID need to be conducted on all reactors in order to maintain diagnostic accuracy. These results also indicate that 11 % animal prevalence of brucellosis did not exert a detrimental effect on 305-day milk yield and reproductive performance in high milk-yielding Holstein cows.
机译：这项研究的目的是研究接种牛的布鲁氏菌病针对该病的血清阳性是否会影响高产荷斯坦奶牛的繁殖性能和产奶量。为此目的，本研究招募了1,026头对布鲁氏菌病呈血清反应阳性的健康母牛和372头母牛。对卡试验呈阳性且随后在利凡诺醇试验中呈阳性的母牛进一步进行放射免疫扩散（RID）试验。通过布鲁氏菌病筛查测试发现，据推测感染的母牛中只有11％确实感染了这种疾病。布鲁氏菌感染动物为11％的那组母牛的生殖能力没有受到损害;血清阳性和健康的母牛的总妊娠率没有差异（分别为30.9和29.6％）。血清阳性母牛（5.3％）和血清阴性动物（6.9％）的流产率相似。在305天的泌乳期中，受布鲁氏菌感染的动物群中的母牛产生的牛奶比未受影响的母牛多得多（10,684 +/- 1,720对10,345 +/- 1,736;平均值+/- SD; P <0.05）。结论是，在用19和RB51菌株接种布鲁氏菌病疫苗的奶牛群中，需要对所有反应堆进行补充测试，例如RID，以保持诊断准确性。这些结果还表明11％的动物布鲁氏菌病患病率对高产奶的荷斯坦奶牛的305天产奶量和生殖性能没有不利影响。

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