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首页> 外文期刊>African Journal of Biotechnology >Factors affecting reproductive performance of dairy cow in Algeria: Effects of clinical mastitis
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Factors affecting reproductive performance of dairy cow in Algeria: Effects of clinical mastitis

机译：影响阿尔及利亚奶牛繁殖性能的因素：临床乳腺炎的影响

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The objective of the present study was to evaluate the effects of clinical mastitis at the beginning of lactation on reproductive performance of dairy cows in Algeria. Calving to first insemination and calving to conception intervals, number of insemination per conception and conception rate at the first artificial insemination were recorded for 432 cows from 16 dairy herds in Algeria. Cows were examined for clinical mastitis during milking by the personnel or the herd manager. A clinical mastitis case was recognized by the presence of modified milk (more watery, presence of lumps, abnormal odor) or by the presence of signs of inflammation in one or all quarters of the udder. Cows were classified according to the time of clinical mastitis occurrence in three groups: cows presenting clinical mastitis before the first artificial insemination (MG1; n = 62 dairy cows), cows presenting clinical mastitis between the first artificial insemination and pregnancy diagnosis (MG2; n = 54 dairy cows), and cows without any signs of clinical mastitis before or after the first insemination (Control - CG; n = 316 dairy cows). Calving to first artificial insemination and calving to conception intervals for cows with signs of clinical mastitis before the first artificial insemination (137.26 ± 7.36 days and 180.48 ± 7.25 days) and in cows with signs of clinical mastitis after the first artificial insemination (190.85 ± 9.23 and 202.51 ± 10.32 days) were significantly (p < 0.05) higher than that of the clinically healthy cows (111.01 ± 5.42 and 147.32 ± 8.44 days), respectively. The number of inseminations per conception in cows that exhibited clinical mastitis before the first artificial insemination (1.94 ± 0.85) and in cows with signs of clinical mastitis after the first artificial insemination (2.4 ± 0.94) was significantly higher compared to that of the control cows? (1.61 ± 0.75) (p < 0.05). Conception rate at first artificial insemination in control cows was significantly (p < 0.05) greater than in cows that exhibit clinical mastitis before or after the first artificial insemination (61.39 compared to 38.71 and 33.33% for CG, MG1 and MG2, respectively). The negative effects of clinical mastitis were observed in both primiparous and multiparous cows. In conclusion, results of our study clearly indicate that, clinical mastitis decreases reproductive performance of dairy cows.
机译：本研究的目的是评估泌乳初期临床乳腺炎对阿尔及利亚奶牛繁殖性能的影响。记录了阿尔及利亚来自16个奶牛场的432头母牛的初次受精和初次受精的间隔，第一次受精的受精次数和首次人工受精的受胎率。人员或牧群管理员在挤奶过程中对母牛进行了临床乳腺炎检查。在乳腺的一个或全部四分之一中，存在改性乳汁（多水，结块，异味）或存在炎症迹象，可以识别出临床乳腺炎病例。根据临床乳腺炎发生的时间将母牛分为三组：在第一次人工授精之前出现临床乳腺炎的母牛（MG1; n = 62头奶牛）;在第一次人工授精和怀孕诊断之间出现临床乳腺炎的母牛（MG2; n = 54头奶牛），以及在第一次人工授精前后没有任何临床乳腺炎迹象的奶牛（对照组-CG; n = 316头奶牛）。在第一次人工授精之前（137.26±7.36天和180.48±7.25天），以及在第一次人工授精之后出现临床乳腺炎迹象的母牛（190.85±9.23），对初次人工授精的产犊和产卵间隔进行产犊和202.51±10.32天）分别显着（p <0.05）高于临床上健康的母牛（111.01±5.42和147.32±8.44天）。首次人工授精前表现出临床乳腺炎的母牛的每次受精次数（1.94±0.85），以及第一次人工授精后出现临床乳腺炎迹象的母牛的受精次数（2.4±0.94），明显高于对照组。 ？ （1.61±0.75）（p <0.05）。对照牛的第一次人工授精受胎率显着（p <0.05）高于第一次人工授精前后表现出临床乳腺炎的母牛（61.39，而CG，MG1和MG2分别为38.71％和33.33％）。在初乳和多胎牛中均观察到临床乳腺炎的负面影响。总之，我们的研究结果清楚地表明，临床乳腺炎会降低奶牛的繁殖性能。

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