The influence of terminal sire breed on carcass composition and eating quality of crossbred lambs

被引:58
作者
Ellis, M
Webster, GM
Merrell, BG
Brown, I
机构
[1] MAFF,AGR ADVISORY SERV,REDESDALE EXPT HUSB FARM,NEWCASTLE TYNE,TYNE & WEAR,ENGLAND
[2] NORTHUMBRIA UNIV,DEPT CHEM & LIFE SCI,NEWCASTLE TYNE NE7 7XA,TYNE & WEAR,ENGLAND
来源
ANIMAL SCIENCE | 1997年 / 64卷
关键词
carcass composition; crossbreds; lambs; organoleptic traits; sex;
D O I
10.1017/S1357729800015575
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Carcass and eating quality characteristics of crossbred wether and female lambs sired by Charollais (C), Suffolk (S) and Texel (T) rams out of Mule ewes (Bluefaced Leicester male X Scottish Blackface female or Swaledale female) were evaluated in a study carried out over a 3-year period in an upland flock. A total of 10 unrelated rams of each breed were used as sires. Lambs (no. = 280) were selected for slaughter at the same estimated subcutaneous fat level on four occasions within each year (i.e. at weaning in July and at approx. monthly intervals thereafter). Following slaughter, the left side of each carcass was physically dissected. A loin joint from lambs slaughtered in the 2nd and 3rd years of the study (no. = 184) was used to evaluated eating quality. Suffolk-sired lambs were heavier at slaughter (S: 42.2; C: 41.0; T :40.7 (s.e. 0.35) kg) but had similar killing-out proportions compared with the other two breeds (S: 444; C: 450; T: 452 (s.e. 26) g/kg). Texel-sired lambs had higher lean proportion (S: 543; C: 550; T: 567 (s.e. 4.4) g/kg) and lower total carcass fat proportion (S: 240; C: 242; T: 233 (s.e. 5.3) g/kg) compared with S and C sired lambs. Bone proportion was similar for C and T lambs but was higher for S (S: 199; C: 191; T: 191 (s.e. 2.1) g/kg). Lean : bone (S: 2.75; C: 2.90; T: 2.99 (s.e. 0.037)) and lean :fat (S: 2.38; C: 2.40; T: 2.54 (s.e. 0.034)) ratios were higher for T-sired lambs. Female lambs were lighter (40.4 v. 42.2 (s.e. 0.24) kg), and had proportionately more intermuscular fat than wethers (122 v. 118 (s.e. 1.3) g/kg) but the sex differences for other tissue proportions were small. Carcass weights and total carcass fat proportions increased and lean proportions decreased across the four slaughter dates. There were no effects of breed or sex on eating, quality. However, samples from lambs slaughtered at weaning were judged to be move tenner than those slaughtered Inter in the season.
引用
收藏
页码:77 / 86
页数:10
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