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首页> 外文期刊>Tropical Animal Health and Production >Onset of puberty and regularity of oestral cycles in ewe lambs of four breeds under high-altitude conditions in a non-seasonal country
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Onset of puberty and regularity of oestral cycles in ewe lambs of four breeds under high-altitude conditions in a non-seasonal country

机译：在一个非季节性国家的高空条件下，在四种品种的eStral循环的青春期和规律性发作

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Twenty-four Colombian Creole, Romney Marsh, Hampshire and Corriedale ewes raised under high-altitude conditions in a non-seasonal country were used to determine and to characterize the onset of puberty and of regularity ovarian function since the age of 3months. They underwent blood collection for determination of progesterone and monthly weight assessment. Oestrus was assessed daily by a teaser ram. In all breeds, age at onset of puberty ranged from 5.4 to 6.9 months and age at onset of regular ovarian function ranged from 7.4 to 8.6 months. Colombian Creole showed a higher body development at onset of puberty: 73.5 +/- 8.3% versus 56.2 +/- 7.4 in Romney Marsh, 58.8 +/- 10.4 in Hampshire, and 57.3 +/- 8.0 in Corriedale (p < 0.05), as well as a higher relative daily weight gain (+17%, p < 0.05). A negative correlation between daily weight gain and age at onset of puberty was established. Progesterone at onset of puberty and of regularity did not differ between breeds, but characterization of the luteal phase by the progesterone area under the curve (P4-AUC) revealed at both time points significantly lower values for Creole lambs (p < 0.05). Decreased P4-AUC paralleled a higher proportion of short oestral cycles observed prior to onset of regularity in Creoles, whereas an increased proportion of extra-long cycles were recorded in Romney Marsh (p < 0.05). These results establish first reference data for economically important breeds raised under tropical conditions. In comparison with other breeds, Colombian Creole requires a higher body development to achieve puberty and that an important proportion of short characterizes its prepubertal period cycles.
机译：在非季节性国家的高空条件下提出的二十四个哥伦比亚克里奥尔，罗姆尼·沼泽，汉普郡和科尔德莱母羊被用来确定，并以3个月的年龄以来，以自3个月以来的青春期和规律性卵巢作用的发作。他们接受了血液收集以确定孕酮和每月重量评估。每天通过一坯ram每天评估病症。在所有品种中，青春期发作的年龄范围从5.4〜6.9个月，常规卵巢职能发作的年龄范围为7.4至8.6个月。哥伦比亚克里奥尔在青春期发作时显示出更高的身体发育：73.5 +/- 8.3％，罗伯德尔58.8 +/- 10.4，58.8 +/- 10.4，57.3 +/- 8.0，in corriedale（p <0.05），以及更高的相对每日体重增加（+ 17％，P <0.05）。建立了青春期发作的每日体重增加和年龄之间的负相关性。青春期和规律性发作的黄体酮在品种之间没有区别，但在曲线（P4-AUC）下的丙酮面积的表征在两个时间点下显示的克里孔羔羊的值显着降低（P <0.05）。降低P4-AUC平行于在牛油中的规律性开始之前观察到的较高比例的短卵囊循环，而在Romney Marsh中记录了增加的超长循环比例增加（P <0.05）。这些结果为在热带条件下提高的经济上重要品种的首要参考数据。与其他品种相比，哥伦比亚克里尔孔需要更高的身体开发来实现青春期，并且重要的简短表征其预接种周期循环。

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