Mbuku Samuel, Kosgey Isaac, Okeyo Mwai, Kahi Alexander
Division is National Beef Research Centre, Kenya Agricultural Research Institute, P.O. Box 3840, Nakuru, 20100, Kenya,
Trop Anim Health Prod. 2014 Jun;46(5):789-95. doi: 10.1007/s11250-014-0567-8. Epub 2014 Mar 14.
Economic values for production traits (milk yield, MY, g; 12-month live weight, yLW, kg; consumable meat percentage, CM, %) and functional traits (mature doe live weight, DoLW, kg; mature buck live weight, LWb, kg; kidding frequency, KF; pre-weaning survival rate, PrSR, %; post-weaning survival rate, PoSR,%; doe survival rate, DoSR, %; and residual feed intake, RFI, kg) were estimated using profit functions for the Small East African goat. The scenario evaluated was a fixed flock size, and the resultant economic values (Kes per doe per year) were 34.46 (MY), 62.35 (yLW), 40.69 (CM), 0.15 (DoLW), 2.84 (LWb), 8.69 (KF), 17.38 (PrSR), 16.60 (PoSR), 16.69 (DoSR) and -3.00 (RFI). Similarly, the economic values decreased by -14.7 % (MY), -2.7 % (yLW), -23.9 % (CM), -6.6 % (DoLW), -98 % (LWb), -8.6 % (KF), -8.2 % (PrSR), -8.9 % (PoSR), -8.1 % (DoSR) and 0 % (RFI) when they were risk rated. The economic values for production and functional traits, except RFI, were positive, which implies that genetic improvement of these traits would have a positive effect on the profitability in the pastoral production systems. The application of an Arrow-Pratt coefficient of absolute risk aversion (λ) at the level of 0.02 resulted in a decrease on the estimated economic values, implying that livestock keepers who were risk averse were willing to accept lower expected returns. The results indicate that there would be improvement in traits of economic importance, and, therefore, easy-to-manage genetic improvement programmes should be established.
利用小体型东非山羊的利润函数，估算了生产性状（产奶量，MY，克；12月龄活重，yLW，千克；可食用肉百分比，CM，%）和功能性状（成年母羊活重，DoLW，千克；成年公羊活重，LWb，千克；产羔频率，KF；断奶前成活率，PrSR，%；断奶后成活率，PoSR，%；母羊成活率，DoSR，%；以及剩余采食量，RFI，千克）的经济价值。所评估的情景是固定的畜群规模，由此得出的经济价值（每只母羊每年肯尼亚先令）分别为：34.46（产奶量）、62.35（12月龄活重）、40.69（可食用肉百分比）、0.15（成年母羊活重）、2.84（成年公羊活重）、8.69（产羔频率）、17.38（断奶前成活率）、16.60（断奶后成活率）、16.69（母羊成活率）和 -3.00（剩余采食量）。同样，在进行风险评级时，经济价值下降幅度分别为：-14.7%（产奶量）、-2.7%（12月龄活重）、-23.9%（可食用肉百分比）、-6.6%（成年母羊活重）、-98%（成年公羊活重）、-8.6%（产羔频率）、-8.2%（断奶前成活率）、-8.9%（断奶后成活率）、-8.1%（母羊成活率）和0%（剩余采食量）。除剩余采食量外，生产性状和功能性状的经济价值均为正值，这意味着对这些性状进行遗传改良将对牧区生产系统的盈利能力产生积极影响。应用0.02水平的阿罗-普拉特绝对风险规避系数（λ）会使估计出的经济价值降低，这意味着风险规避型的牲畜饲养者愿意接受较低的预期回报。结果表明，具有经济重要性的性状将会得到改善，因此，应制定易于管理的遗传改良计划。
