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首页> 外文期刊>Tropical Animal Health and Production >Effect of semen collection frequency on seasonal variation in sexual behaviour, testosterone, testicular size and semen characteristics of tropical hair rams (Ovis aries)
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Effect of semen collection frequency on seasonal variation in sexual behaviour, testosterone, testicular size and semen characteristics of tropical hair rams (Ovis aries)

机译：精液收集频率对热带毛公羊性行为，睾丸激素，睾丸大小和精液特性季节性变化的影响

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摘要

The purpose of this study was to examine the effect of day length on seminal characteristics, testicular size, sexual behaviour and testosterone (T4) concentration in Pelibuey rams subjected to different semen collection frequencies. Eighteen intact males were assigned randomly to one of two semen collection frequencies: in the high rate (HR) treatment, two ejaculations per week were obtained from each ram; one ejaculation every two weeks was collected under the low rate (LR) treatment. All animals were housed individually in contiguous 5 m × 5 m wire mesh pens and evaluated over a 12-month period. At the beginning of the experiment rams were 20 months old and 40–50 kg in weight. All rams ejaculated and produced semen throughout the year. Semen volume, sperm per ejaculation, testicular circumference and testicular volume were significantly (p < 0.05) greater during short days in all rams, regardless of the semen collection frequency, with the exception of sperm concentration, for which no variation was found in HR individuals, and reaction time and T4 levels, for which no variation was found in LR males. Rams subjected to HR collection were more affected by the short-day photoperiod than rams collected twice per week, exhibiting greater reduction (p < 0.05) in time to achieve their first ejaculation and in sperm per ejaculation, as well as greater increases (p < 0.05) in T4 concentration than LR rams (14.65 ± 1.22 vs 23.53 ± 5.34 s, (3.37 ± 0.17) × 109 vs (3.52 ± 0.20) × 109 sperm and 8.68 ± 0.44 vs 6.85 ± 0.74 ng/ml, respectively). It was concluded that: (a) the magnitude of the seasonal effects was not sufficient to prevent the rams being used for breeding throughout the year, and (b) seasonal variation within variables was affected differently between semen collection frequencies.
机译：这项研究的目的是检验日粮长度对精液采集频率不同的Pelibuey公羊精液特性，睾丸大小，性行为和睾丸激素（T4）浓度的影响。将18个完整雄性随机分配给两个精液收集频率之一：在高比率（HR）治疗中，每个公羊每周两次射精；在低比率（LR）治疗下，每两周收集一次射精。将所有动物单独饲养在连续的5 m×5 m丝网笔中，并在12个月内进行评估。在实验开始时，公羊的年龄为20个月，体重为40-50公斤。全年所有公羊射精并产生精液。所有公羊的精液体积，每次射精的精子，睾丸周长和睾丸体积均在短时间内显着增加（p <0.05），而与精液收集频率无关，精子浓度除外，在HR个体中没有发现差异，反应时间和T4 的水平，而在LR男性中则没有变化。与接受每周两次采集的公羊相比，接受HR收集的公羊受短期光周期的影响更大，在第一次射精和每次射精的精子中表现出更大的减少（p <0.05），以及更大的增加（p < T4浓度低于LR公羊（14.65±1.22 vs 23.53±5.34 s，（3.37±0.17）×109 vs（3.52±0.20）×109 精子和8.68±0.44分别为6.85±0.74 ng / ml）。结论是：（a）季节性影响的程度不足以防止全年使用公羊繁殖，并且（b）精液采集频率之间变量内的季节性变化受到不同的影响。

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  • 来源
    《Tropical Animal Health and Production》 |2007年第4期|271-277|共7页
  • 作者

    V. Aguirre; A. Orihuela; R. Vázquez;

  • 作者单位

    Facultad de Ciencias Agropecuarias de la Universidad Autónoma del Estado de Morelos Av. Universidad 1001 Col. Chamilpa Cuernavaca Morelos 62210 México;

    Facultad de Ciencias Agropecuarias de la Universidad Autónoma del Estado de Morelos Av. Universidad 1001 Col. Chamilpa Cuernavaca Morelos 62210 México;

    Facultad de Ciencias Agropecuarias de la Universidad Autónoma del Estado de Morelos Av. Universidad 1001 Col. Chamilpa Cuernavaca Morelos 62210 México;

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  • 正文语种 eng
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  • 关键词

    Hair sheep; Seasonality; Semen collection frequency; Photoperiod;

    机译：毛羊;季节性;精液采集频率;光周期;

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