Birth weight of an animal is first observable quantitative trait, which reflects the inherent ability for growth. The animals having higher birth weight am likely to grow faster and may have higher overall productivity. Hence this trait can be usedas tool of selection. The data on birth weight of 204 Rambouillet X Sonadi halfbreds extended over a period of 10 years (1985-1994) were obtained from Govt. Sheep Breeding Farm, Chittorgarh (Rajasthan). The entire duration of 10 years was divided into 5periods of 2 years each and the year was divided into three seasons viz., winter (October-January), summer (February-May) and rainy (June-September). Due to non-orthogonality the data were analysed by using least squares technique of fitting constants asdescribed by Harvey (1979). The significance of sub-class differences was tested by Duncan's Multiple Range Test (DMRT) as modified by Krammer (1957). The heritability of birth weight was calculated on adjusted data by paternal half sib correlation method as described by Hazel and Terril (1946). The standard error of heritability estimate was obtained by using the formula suggested by Swiger et al. (1964). The overall least squares mean of birth weight was estimated as 3.17+-0.11 kg. It is well comparable with the findings of Kulkarni and Deshpande (1990) in Merino halfbreds.
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机译：动物的出生体重是第一个可观察到的定量特征，它反映了内在的生长能力。具有较高出生体重的动物很可能生长得更快，并且可能具有更高的整体生产力。因此，该特征可以用作选择工具。从政府获得了204个Rambouillet X Sonadi半犬的出生体重的数据，这些混血的寿命已超过10年（1985-1994年）。 Chittorgarh（拉贾斯坦邦）绵羊饲养场。整个10年的持续时间分为5个时期，每个2年，一年分为三个季节，即冬季（10月至1月），夏季（2月至5月）和多雨（6月至9月）。由于非正交性，数据采用Harvey（1979）所述的拟合常数最小二乘法进行分析。子类差异的重要性通过由Krammer（1957）修改的Duncan多范围测试（DMRT）进行了测试。如Hazel和Terril（1946）所述，通过父亲半同胞相关方法根据调整后的数据计算出生体重的遗传力。遗传力估计的标准误差是通过使用Swiger等人建议的公式获得的。 （1964）。出生体重的总体最小二乘均值估计为3.17 + -0.11 kg。它与美利奴羊的Kulkarni和Deshpande（1990）的发现具有很好的可比性。
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