An attempt was made for the first time in India to develop the performance indices for quantifying the relative emphasis to be given to production, reproduction, health and longevity traits for selection and genetic improvement of Sahiwal cattle in a sustainable manner. The study was conducted using information related to various production, reproduction, health and longevity traits spread over a period of 29 years in Sahiwal cattle. Using income and expenditure method, the relative economic values for 305 days milk yield (305DMY), average daily milk yield (ADMY), calving to first insemination interval (CFI), days open (DO) and longevity (LNG) were estimated as 1, 1, −6.62, −6.62 and 5.96 in Sahiwal cattle. A total of three performance indices were constructed using three‐trait combination, that is production, reproduction and longevity before and after excluding the days suffered by the animals. Correlation between the aggregate genotype and index (R_IH) was computed to determine the accuracy of each performance index, and based on highest R_IH value, best performance index was identified for selection of Sahiwal cattle. Developed indices were further assessed for robustness by increasing the relative economic values of the traits by 25% and 50%. The performance index (305DMY, DO and LNG) was found to be the best index before as well as after excluding days suffered by the animals, but in later case emphasis to be given to different traits was found to be more balanced. The best index indicated that about 47, 42 and 11% relative emphasis to be assigned to 305 days milk yield, days open and longevity for selection of Sahiwal animals for sustainable genetic improvement.

中文翻译：

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基于生产、繁殖、健康和长寿的可持续性能指标的开发，用于 Sahiwal 牛的遗传改良

印度首次尝试制定性能指数，以量化对生产、繁殖、健康和长寿性状的相对重视，以可持续的方式选择和遗传改良 Sahiwal 牛。该研究使用与 Sahiwal 牛 29 年间传播的各种生产、繁殖、健康和长寿特征相关的信息进行。采用收入和支出法，305天产奶量（305DMY）、平均日产奶量（ADMY）、产犊至第一次授精间隔（CFI）、开放天数（DO）和寿命（LNG）的相对经济价值估计为1 , 1, -6.62, -6.62 和 5.96 在 Sahiwal 牛。使用三性状组合构建了总共三个性能指标，即生产、不包括动物遭受的天数之前和之后的繁殖和寿命。聚合基因型与指数之间的相关性 (R_IH ) 被计算以确定每个性能指标的准确性，并根据最高的 R _IH值确定最佳性能指标用于选择 Sahiwal 牛。通过将性状的相对经济价值提高 25% 和 50%，进一步评估开发指数的稳健性。发现性能指数（305DMY、DO 和 LNG）是在排除动物遭受天数之前和之后的最佳指数，但在后来的情况下，发现对不同性状的重视更加平衡。最佳指数表明，大约 47%、42% 和 11% 的相对重点被分配给 305 天的产奶量、开放天数和寿命，以选择 Sahiwal 动物进行可持续遗传改良。