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首页> 外文期刊>Tropical Animal Health and Production >Monthly variation of fertility and oestrus frequency in crossbred dual-purpose cows in three agroecological areas of the South American tropics
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Monthly variation of fertility and oestrus frequency in crossbred dual-purpose cows in three agroecological areas of the South American tropics

机译：南美热带地区三个农业生态区杂交两用奶牛的生育力和发情频率的月变化

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摘要

The aim of this study was to examine the monthly variation of the first service conception (FSC) and oestrus frequency (OF) from 8308 artificial inseminations (AI) of 2960 crossbred dual-purpose cows on three commercial farms with improved management located in the Maracaibo Lake Basin, Venezuela. The effects of month of the year, agroecological area (from dry tropical forest to sub-humid tropical forest on the three farms), predominant breed (BT, Bos taurus; BI, Bos indicus), and season (December–April}; May–August; and September–November) were considered. Data were analysed using logistic regression (FSC) and GLM (OF) from SAS. The mean FSC was 55.4% overall and 48.7%, 57.0% and 58.3% for farms A, B and C, respectively (p < 0.01). Within the three agroecological areas (farms A, B and C), the FSC was highest during the cooler and drier months of the year (season 1), while the lowest FSC was obtained during the months of highest rainfall and humidity (season 3) (53.3% vs 37.4%; 58.5% vs 49.0% and 63.0% vs 52.3% on farms A, B, C, respectively; p < 0.01). In the three studied farms, OF was higher during the first 4 months of the year; with a diminishing trend towards the end of the year (p % 0.05). In general, BI cows had a higher FSC than BT cows, especially during the second half of the year, when environmental conditions were characterized by higher rainfall and humidity with lower wind velocity (58.8%a 55.5%b and 46.4%c in season 1, 2 and 3 respectively; a, b, c p < 0.01).
机译：这项研究的目的是在马拉开波的三个商业农场检查3960头两用杂种母牛的8308人工授精（AI）的8308次人工授精（AI）的第一服务概念（FSC）和发情频率（OF）的每月变化委内瑞拉湖盆地。一年中一个月，农业生态区域（从干旱的热带森林到半湿润的热带森林对这三个农场），主要品种（BT，Bos taurus； BI，Bos indicus）和季节（12月至4月）的影响； 5月– 8月； 9月– 11月）。使用SAS的逻辑回归（FSC）和GLM（OF）分析数据。农场A，B和C的平均FSC总体为55.4％，分别为48.7％，57.0％和58.3％（p <0.01）。在三个农业生态区域（农场A，B和C）中，FSC在一年中的凉爽和干燥的月份（季节1）最高，而在降雨量和湿度最高的月份中获得最低的FSC（季节3）。 （A，B，C农场分别为53.3％对37.4％; 58.5％对49.0％和63.0％对52.3％; p <0.01）。在这三个研究农场中，一年前4个月的OF较高；到年底时呈下降趋势（p％0.05）。通常，BI牛的FSC高于BT牛，尤其是在下半年，当时的环境条件是降雨和湿度较高，风速较低（58.8％a 55.5％b 和分别在第1、2和3季达到46.4％c ； a，b，c p <0.01）。

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  • 来源
    《Tropical Animal Health and Production》 |2006年第4期|353-363|共11页
  • 作者

    F. Perea G.; E. Soto B.; H. Hernández F.; D. González V.; R. Palomares N.; A. De Ondiz S.; C. González S.;

  • 作者单位

    Departamento de Ciencias Agrarias Universidad de los AndesMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

    Facultad de Ciencias Veterinarias y Facultad de Agronomía Universidad del ZuliaMiembros del Grupo de Investigadores de la Reproducción Animal en la Región Zuliana (GIRARZ);

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  • 正文语种 eng
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  • 关键词

    First service conception; Oestrus frequency; Crossbred cows; Postpartum; Tropic;

    机译：第一次服役;发情频率;杂交母牛;产后;热带;

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