Nadri Sara, Sadeghi-Sefidmazgi Ali, Zamani Pouya, Ghorbani Gholam Reza, Toghiani Sajjad
Department of Animal Sciences, College of Agriculture, Isfahan University of Technology, Isfahan 83111-84156, Iran.
Department of Animal Science, University of Tehran, Karaj P.O. Box 3158711167-4111, Iran.
Animals (Basel). 2023 Mar 31;13(7):1216. doi: 10.3390/ani13071216.
This study aimed to evaluate the economic impact of improving feed efficiency on breeding objectives for Iranian Holsteins. Production and economic data from seven dairy herds were used to estimate the economic values of different traits, and a meta-analysis was conducted to analyze the genetic relationships between feed efficiency and other traits. Economic weights were calculated for various traits, with mean values per cow and per year across herds estimated at USD 0.34/kg for milk yield, USD 6.93/kg for fat yield, USD 5.53/kg for protein yield, USD -1.68/kg for dry matter intake, USD -1.70/kg for residual feed intake, USD 0.47/month for productive life, and USD -2.71/day for days open. The Iranian selection index was revised to improve feed efficiency, and the feed efficiency sub-index (FE$) introduced by the Holstein Association of the United States of America was adopted to reflect Iran's economic and production systems. However, there were discrepancies between Iranian and US genetic coefficients in the sub-index, which could be attributed to differences in genetic and phenotypic parameters, as well as the economic value of each trait. More accurate estimates of economic values for each trait in FE$ could be obtained by collecting dry matter intake from Iranian herds and conducting genetic evaluations for residual feed intake.
本研究旨在评估提高饲料效率对伊朗荷斯坦奶牛育种目标的经济影响。利用七个奶牛场的生产和经济数据来估计不同性状的经济价值，并进行荟萃分析以分析饲料效率与其他性状之间的遗传关系。计算了各种性状的经济权重，各牛群每头奶牛每年的平均值估计为：产奶量0.34美元/千克，产脂量6.93美元/千克，产蛋白量5.53美元/千克，干物质采食量-1.68美元/千克，剩余饲料采食量-1.70美元/千克，生产寿命0.47美元/月，空怀天数-2.71美元/天。修订了伊朗的选择指数以提高饲料效率，并采用了美国荷斯坦协会推出的饲料效率子指数（FE$）来反映伊朗的经济和生产体系。然而，该子指数中伊朗和美国的遗传系数存在差异，这可能归因于遗传和表型参数以及各性状经济价值的不同。通过收集伊朗牛群的干物质采食量并对剩余饲料采食量进行遗传评估，可以获得FE$中各性状更准确的经济价值估计。
