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首页> 外文期刊>Tropical Animal Health and Production >Ovarian activity in beef and dairy cows with prolonged postpartum period and heifers that fail to conceive
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Ovarian activity in beef and dairy cows with prolonged postpartum period and heifers that fail to conceive

机译：产后时间延长和母牛未受孕的母牛和奶牛的卵巢活动

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The primary objectives of this study were to investigate incidence of abnormal ovarian cyclicity (AOC) and its type in dairy and beef cows with prolonged postpartum period (>90 days) and in heifers that fail to conceive. A total of 53 animals were included in the study: 17 Friesian crosses, 16 Braford crosses, eight Brangus crosses, and 12 local Kedah-Kelantan (KKX) crosses. These animals were initially checked for absence of pregnancy via palpation per rectum. Blood samples for progesterone analysis were obtained twice a week for 2 to 3 months following their spontaneous oestrous cycle, and all animals were rechecked for pregnancy at the end of the study. Progesterone analysis indicated that 33.9% of the total animals were having AOC: 18.9% with cessation of ovarian cyclicity, 9.4% with prolonged luteal phases (PLP), and 5.7% short luteal phases. The highest incidence was observed in Brangus crosses (62.5%), followed by Braford crosses (43.8%), and Friesian crosses (35.3%). In contrast, no AOC was observed in the local KKX breeds, and all of them were found to be pregnant at the end of the study. A significant difference (p<0.05) in the incidence of AOC and its type was observed between Kedah-Kelantan crosses and the other breeds. Although not significant (p>0.05), Friesian crosses showed a higher percentage incidence of AOC than beef cows (40% vs 36.4%), with major types being PLP (26.7%) in dairy and cessation of ovarian cycle (27.3%) in beef cows. Compared with beef heifers, beef cows showed a higher percentage of AOC (36.4% vs 28.6%) where again, cessation of cyclicity was the predominant abnormality. In conclusion, AOC reflected by abnormal endocrine pattern is a possible cause of reduction in fertility for dairy and beef cows beyond 90 days postpartum and heifers that fail to conceive.
机译：这项研究的主要目的是调查产后期延长（> 90天）和未受孕的小母牛的异常卵巢周期性（AOC）的发生率及其类型。该研究共纳入53只动物：17个弗里斯兰（Friesian）杂交，16个布拉福德（Braford）杂交，8个Brangus杂交和12个当地的吉打-Kelantan（KKX）杂交。最初通过触诊直肠检查这些动物是否怀孕。自发性自发性周期后的每周2到3个月，每周两次采集用于孕酮分析的血样，并在研究结束时对所有动物进行妊娠检查。孕酮分析表明，总动物中有33.9％患有AOC：卵巢周期停止的占18.9％，黄体期延长（PLP）占9.4％，短黄体期占5.7％。 Brangus杂交（62.5％），Braford杂交（43.8％）和Friesian杂交（35.3％）的发生率最高。相反，在当地的KKX品种中未观察到AOC，并且在研究结束时发现它们全部都已怀孕。吉打-Kelantan杂交与其他品种之间的AOC发生率及其类型之间存在显着差异（p <0.05）。尽管差异不显着（p> 0.05），但Friesian杂交显示的AOC发生率比肉牛高（40％比36.4％），主要类型是乳制品中的PLP（26.7％）和停止卵巢周期（27.3％）。肉牛。与牛小母牛相比，肉牛的AOC比例更高（36.4％比28.6％），而周期性的停止是主要的异常。总之，内分泌模式异常所反映的AOC可能是导致产后90天以上的奶牛和肉牛以及未受孕的小母牛生育能力下降的原因。

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