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首页> 外文期刊>Livestock Science >A comparison of Friesian, Aberdeen AngusxFriesian and Belgian BluexFriesian steers finished at pasture or indoors
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A comparison of Friesian, Aberdeen AngusxFriesian and Belgian BluexFriesian steers finished at pasture or indoors

机译：在牧场或室内完成的Friesian，Aberdeen Angusx Friesian和比利时BluexFriesian ers牛的比较

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Cross-breeding of dairy cows with beef bulls is common in Ireland with the Aberdeen Angus and Belgian Blue beef breeds both widely used. These breeds differ in maturity and consequently in their suitability for production systems differing in intensity and slaughter age. The objective of this study was to compare spring-born Holstein-Friesian (FR), Aberdeen AngusxHolstein-Friesian (AA) and Belgian Blue xHolstein-Friesian (BB) steers slaughtered off pasture at the end of their second grazing season or slaughtered at the end of the second winter following indoor finishing. Fifty-four (18 per breed type) steers were managed together to 16 months of age. They were then blocked on weight within breed type and assigned to a 3 (breed types)x2 (finishing strategies) factorial experiment. The two finishing strategies were (i) concentrate supplementation (mean 3.65 kg/day) at pasture for 105 days to slaughter, and (ii) pasture only for 105 days followed by indoor finishing on grass silage plus concentrates for 141 days to slaughter. Mean slaughter and carcass weights per day of age for FR, AA and BB were 852, 802 and 834 (S.E. 13.1) g, and 427, 412 and 452 (S.E. 7.3) g, respectively. Corresponding kill-out proportions, carcass conformation and carcass fat classes were 501, 514 and 542 (S.E. 2.4) g/kg, 1.90, 2.15 and 2.89 (S.E. 0.073), and 3.09, 3.27 and 2.59 (S.E. 0.122), respectively. The response to concentrates at pasture was 101 g live weight and 83 g carcass weight per kg dry matter. It is concluded that there were few differences between FR and AA in carcass growth and composition but BB had heavier carcasses of better conformation with higher proportions of lean meat and high-value lean joints than both FR and AA. Acceptable live weight and carcass weight gains were obtained on pasture plus concentrates but BB and FR carcasses were not acceptably finished off pasture. Both FR and AA produced acceptable carcasses following indoor finishing and BB carcasses, while below the target fat class, were acceptably finished based on internal fat and dissected carcass fat proportions.
机译：在爱尔兰，奶牛与公牛的杂交育种很普遍，阿伯丁·安格斯（Aberdeen Angus）和比利时蓝牛肉品种都被广泛使用。这些品种的成熟度不同，因此它们在强度和屠宰年龄不同的生产系统中的适应性也不同。这项研究的目的是比较春季出生的Holstein-Friesian（FR），Aberdeen AngusxHolstein-Friesian（AA）和比利时蓝xHolstein-Friesian（BB）ste牛在第二个放牧季节结束时从牧场宰杀或在屠宰场宰杀的ste牛。室内装修结束后的第二个冬天结束。总共管理了五十四只（每品种18只）ste牛，直到16个月大。然后将它们的体重限制在品种类型之内，并分配给3（品种类型）x2（整理策略）析因实验。两种整理策略是：（i）在牧场上补充浓缩物（平均每天3.65千克/天）以屠宰105天，和（ii）仅在牧场上补充105天，然后在室内进行草料青贮加精矿以在屠宰后补充141天。 FR，AA和BB的平均日屠宰体重和car体重量分别为852、802和834（S.E. 13.1）g，以及427、412和452（S.E. 7.3）g。相应的淘汰率，car体构象和car体脂肪类别分别为501、514和542（S.E. 2.4）g / kg，1.90、2.15和2.89（S.E. 0.073）和3.09、3.27和2.59（S.E. 0.122）。牧场中对浓缩物的反应为每千克干物质101 g活重和83 g cas体重。结论是，FR和AA的car体生长和组成差异不大，但BB具有比FR和AA更好的构型，具有更高比例的瘦肉和高价值的瘦肉接头。在牧场加精矿上可获得可接受的活体体重和car体增重，但BB和FR cas体在牧场上收尾不合格。在室内整理后，FR和AA都可以生产出可接受的屠体，而在目标脂肪类别以下的BB屠体则可以根据内部脂肪和解剖后的屠体脂肪比例进行加工。

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