猪氟烷基因的检测及其对生长与肉质的影响

对中国瘦肉猪新品系ＤＩ和ＳＪ系３０１头仔猪进行氟烷测验，阳性率为１．３３％。随机抽取氟烷阴性猪３４头进行基因型检测，有６头为杂合子，由此推知ＮＮ、Ｎｎ和ｎｎ的频率分别为８１．２６％１７．４１％和１．３３％，Ｎ和ｎ的频率分别为８９．９７和１０．０３％。对三种基因型的肉质进行评定结果显示，４头氟烷阳性猪（ｎｎ）肉质最差，出现３头严重ＰＳＥ肉和一头轻度ＰＳＥ肉，而氟烷阴性猪未发生ＰＳＥ肉。２８头ＳＪ系氟烷阴性猪用阳性公猪测交，对产出的２０窝２０８头后代进行氟烷测定，共检出４窝中的２１头阳性猪，对测交后代进行肥育性能和肉质测定，结果阳性猪的日增重和饲料转化率等较低，屠宰率、眼肌面积和瘦肉率等较高，肉质较差。

Effect of Halothane Gene on Growth and Meat Quality of Pigs

Halothane test was carried out on 301 piglets of DI and SJ lines,and halothane positive (HP) rate was 1.33%. 34 halothane negative (HN) piglets sampled by random were tested for genotype. It showed that 6 of them were heterozygous,the genotype frequencies of NN,Nn and nn were 81.26%,17.14% and 1.33%,and the frequencies of N and n were 89.97% and 10.03% ,respectively. The meat quality assessment showed that:4 nn were worst with 3 typical and 1 slight PSE muscle,while NN and Nn have no PSE muscle. 208 offsprings of 20 sows test mated by nn were tested with halothane,of which 21 piglets from 4 litters were HP,their daliy gain and feed conversion were lower,their dressing rate,Loin eye area and lean rate were higher and their quality worse than those of HN piglets.