关键词: 甘肃高山细毛羊, 杂交组合, 胴体分级, 胴体分割, 切块重量, 切块比例

Abstract: In order to investigate the crossbreeding and improvement effect of meat-type performance in Gansu Alpine Merino, F1 hybrid of Australian Merino×Gansu Alpine Merino (AG), Bond×Gansu Alpine Merino (BG), Texel×Gansu Alpine Merino (TG) and pure breeding of Gansu Alpine Merino (GG) were taken as test objects. Carcass classification results of 6-month-old lamb from 4 populations were evaluated referring to lamb carcass classification standard of New Zealand. Carcass cutting method was established and cutting weight and the proportion of high quality cutting were observed. The results indicated that carcass classification of BG, TG, GG and AG was PM, PL, PL and A, respectively. Left-half carcass was cut as the first class meat (shoulder, loin-rump and longissimus dorsi and lumber), the second class meat (neck, sternocostal, thoracic and lumber vertebrae, and abdominal) and the third class meat (fore shank and hind shank). The weight of all cutting was the maximal in BG. BG’s neck weight (0.364 kg) was higher by 0.103 kg, 0.109 kg and 0.078 kg than that of AG, TG and GG (P<0.01). BG’s shoulder weight (1.575 kg) was higher by 0.814 kg, 0.329 kg and 0.583 kg than that of AG, TG and GG (P<0.01). BG’s abdominal weight (0.523 kg) was higher by 0.300 kg, 0.133 kg and 0.203 kg than that of AG, TG and GG (P<0.01). There was no significant differences about the proportions of sternocostal, and thoracic and lumber vertebrae among these 4 sheep populations (P>0.05). BG’s the proportions of shoulder and abdominal were the maximal, but it’s proportion of hind shank was the minimum. BG’s the proportion of shoulder (23.04%) was higher by 3.25%, 1.80% and 3.17% than that of AG, TG and GG, respectively, but  its proportion of hind shank (5.22%) was lower by 1.73%, 0.32% and 0.83% than that of AG, TG and GG, respectively. The total proportion of the first and second class meat in BG was 91.30%, and was higher than that in AG (88.40%), TG (91.03%) and GG (90.39%). In conclusion, Bond could not only improve carcass classification result of 6-month-old lamb, but also increase the carcass cutting weight and the proportion of high quality cutting. Therefore, it has the best effect for crossing and improving the meat performance of Gansu Alpine Merino.

Key words: Gansu Alpine Merino, cross combination, carcass classification, carcass cutting, cutting weight, cutting proportion