后備母豬選擇
生長情況
Growth
選擇同窩豬中生長速度快的豬只。
Gilts should be in the fastest growing 50-60% of theircontemporary group.
生長速度快的豬女可以擁有較長的使用年限。
Adequate growth increases the probability of properreproductive development.
生長速度慢的豬女有可能出現初情期延遲的現象，并且在以后的飼養過程中問題較多。
Slow growing females (within a group) may have a delayed first estrus and may be lifelong problem breeders.
背膘
Backfat
背膘厚度對于后備母豬選擇是一個非常重要的指標。
Backfat is important ifreplacement females are produced within the herd.
對于良種豬群，通過《聯邦國家豬群改進指導方針》獲得合適的測量和調整標準。
Consult NSIFGuidelines for Uniform Swine Improvement to obtain proper measurement andadjustment criteria.
特定豬場的推薦背膘厚度會根據遺傳、環境和終端市場的需求而改變。
Recommended levelsof backfat are farm specificand may change due to genetics, environment, and end market.
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