瘦肉型华特猪配套系选育研究

在继代选育甘肃瘦肉型猪新品系Ａ、Ｂ、Ｃ和纯种繁育杜洛克、约克夏与长白猪的基础上,于１９９１年开展了“华特配套系”的选育工作。杜洛克是理想的父本品种,Ａ系拟作父系的母系,Ｂ系拟作母系的父系,Ｃ系拟作母系的母系。经过３年５批次共４８个杂交组合的配合力测定试验表明：ＤＡ、ＤＢ配套系是理想的二元杂交配套模式。ＢＣ组合的瘦肉率较低,仅为５４．５９％,但其繁殖性能突出,宜做三元或四元配套的母系。ＤＬＹ为理想的三元配套杂优猪的生产模式,其日增质量、料肉比、瘦肉率分别为７２５ｇ、３．４７：１、５９．８６％。通过对肥育、胴体、肉质性状的综合分析表明：ＤＡＢＣ是最佳杂交配套模式,ＤＬＹ和ＤＡ次之,ＤＡＢＣ的２５～１００ｋｇ,肥育天数为１００ｄ,日增质量为７４７ｇ、料肉比为３．３８：１、瘦肉率为６０．５０％,配合力测定结果与Ａ、Ｂ、Ｃ的培育目标相一致。

Selection and breeding of "Huate" best hybridized combinations of Lean-meat hybrid swine

On the basis of breeding new strains A、 B、 C and purely breeding Duroc、Yorkshire、 Landrace, selection and breeding of "Huate" best-hybridized combination　werecarried out in 1991. Duroc is ideal sire breed, strain A 、 B and C would be dam line of sire line,sire line of dam line and darn line of dam line. After three-year's experiences of combining abilitydetermination (including five periods), the results showed: DA and DB are ideal three-way crossmodels. Although BC has low lean meat percentage, it can be used for the ideal dam line of threeway or four-way cross model because of its excellent reproductive performance; DLY is goodthree-way cross model with such performance as daily gain (7259)、 feed conversion rate(3.47 :1)and lean meat percentage (59.86 %) respectively. by fully analyzing fatting. carcass and meatperformance, the results showed f the four-way cross combination--DABC is best one, next areDLY and DA. during the period of 25-100 kg, fatting days、daily gain. feed conversion rate andlean meat percentage are 100 d. 747 kg. 3.38 ：1 、60.50 % respectively. those is corresponded withthe breeding objectives of strains A、 B、 and C.