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首页> 外文期刊>Journal of Veterinary Advances >External Features (Developmental Horizons) in Developing Camel Foetus as a Guide to Age Estimation
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External Features (Developmental Horizons) in Developing Camel Foetus as a Guide to Age Estimation

机译：骆驼胎儿发育的外部特征（发展前景）作为年龄估算的指南

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The study was carried out between May, 2009 and April, 2010, during which a total of 153 camel foetuses were collected from slaughtered pregnant dams at Sokoto abattoir. Some gross external features were studied in camel foetuses to aid in their age estimation. In this study abattoir foetal samples up to 75 days of gestation were used. The calvarium was found to be soft membranous with the brain visible at early first trimester of gestation. The calvariums become pliable but soft at centre from late first trimester to early second trimester of pregnancy. At late second trimester the calvarium had became hard. The skin was observed to be pinkish, thin and transparent from early first to the middle of second trimester, in the middle of second trimester the skin became thick, no more transparent but still pinkish. Also in this study it was observed that the external jugular vein was barely visible at early first trimester of gestation. The jugular vein became visible through the skin towards late first trimester of the study and by late first trimester it was no longer visible under the skine. These showed that the appearance and disappearance of the of the jugular vein occurred within the first trimester of pregnancy. It was observed that appearance of hair started around the eye and muzzles from late second trimester of pregnancy. Development of teeth started with 2nd followed by 3rd premolar in the upper and lower jaws at third trimester of pregnancy. With these findings we can say that foetal age could be estimated using external features as they are more reliable than those features that are guided largely by environmental and nutritional factors, like body weight and crown rump length.
机译：这项研究是在2009年5月至2010年4月之间进行的，在此期间，从索科托屠宰场的屠宰怀孕水坝中收集了总共153头骆驼胎儿。研究了骆驼胎儿的一些总体外在特征，以帮助他们估计年龄。在这项研究中，使用了长达75天的屠宰场胎儿样品。发现颅骨软膜质，在妊娠的前三个月早期可见大脑。从怀孕的第一三个月末到第二三个月的早期，颅骨变得柔韧但在中心处变软。在第二学期末期，颅骨变硬。从第一早至中孕中期观察到皮肤是粉红色的，薄的和透明的，在中孕中期中皮肤变得粘稠的，不再透明但仍然是粉红色的。同样在这项研究中，观察到在妊娠的前三个月初期几乎看不到颈外静脉。在研究的头三个月中后期，通过皮肤可见颈静脉，并且在头三个月中晚期，在皮肤下不再可见。这些表明在怀孕的头三个月内发生了颈静脉的出现和消失。据观察，从妊娠中期开始，头发开始出现在眼睛周围和口吻周围。牙齿的发育从妊娠的第三个月开始，第二次是在上颌和下颌的第三次磨牙。有了这些发现，我们可以说，可以使用外部特征来估计胎儿年龄，因为它们比那些主要受环境和营养因素（例如体重和冠臀长）指导的特征更可靠。

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