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首页> 外文期刊>Livestock Science >Effect of early weaning on performance, carcass and meat quality of spring-born bull calves raised in dry mountain areas
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Effect of early weaning on performance, carcass and meat quality of spring-born bull calves raised in dry mountain areas

机译：早期断奶对干旱山区春季出生的牛犊的生产性能，cas体和肉品质的影响

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Sixteen bull calves were born in the Spanish Central Pyrenees in spring. They were either early (EW, 90 days of age) or normal weaned (NW, 180 days of age). At day 90, EW calves were placed on an intensive diet while NW calves were turned out with their dams to high mountain pastures. After summer, at day 180, NW calves were weaned and placed with EW calves on a common finishing diet until slaughter at the fixed age of 1 year. From birth to early weaning date, no performance differences appeared. However, EW calves gained faster (1.549 kg/day) than their unweaned counterparts (0.783 kg/day) from early to normal weaning date (P <0.001). During the finishing period, NW calves showed compensatory growth, with a 44% higher ADG than EW calves (P <0.001), with a similar feed intake and a better feed conversion ratio. Early weaned calves had a longer fattening phase than NW calves (264 vs. 158 days, respectively; P <0.001) and thus total feed intake and feed costs were greater. When slaughtered at 1 year of age, EW and NW calves attained similar weight (489 vs. 510 kg, respectively; P >0.05), but dressing percentage was higher for EW calves (56.9%) than for NW calves (55.2%) (P <0.01), which led EW calves to have heavier carcasses, without differences in fat score or conformation. The different growth paths, the result of weaning management, did not affect meat tenderness, chemical composition and fatty acid profile, but affected meat lightness, with higher values for compensating calves (NW) than calves in continuous growth (EW). In conclusion, advancing weaning age modified calf performance without affecting substantially carcass characteristics, except for an improvement in dressing percentage, or meat quality.
机译：春季，西班牙中比利牛斯省出生了十六头牛犊。他们是早期（EW，90天大）或正常断奶（NW，180天大）。在第90天，将EW小牛置于密集饮食中，而将NW小牛连同其大坝一起转入高山牧场。夏季后，在第180天，将NW犊牛断奶，并与EW犊牛放在一起吃普通的日粮，直到在1岁的固定年龄处死。从出生到早期断奶，没有表现出差异。然而，从断奶早期到正常断奶日期，EW小牛的增重（1.549 kg /天）要比未断奶的同龄人（0.783 kg /天）快（P <0.001）。在肥育期，NW犊牛表现出补偿性生长，ADG比EW犊牛高44％（P <0.001），采食量相似，饲料转化率更高。早期断奶犊牛的肥育期比西北犊牛要长（分别为264天和158天; P <0.001），因此总采食量和饲料成本更高。在1岁时进行屠宰时，EW和NW犊牛的体重相似（分别为489公斤和510公斤; P> 0.05），但是EW犊牛（56.9％）比NW犊牛（55.2％）的修整率更高（ P <0.01），导致EW小牛的have体较重，脂肪评分或构象无差异。断奶处理的结果，不同的生长途径不会影响肉的嫩度，化学成分和脂肪酸分布，但会影响肉的亮度，与连续生长（EW）相比，补偿犊牛（NW）的值更高。总之，提高断奶年龄可以改善犊牛的性能，而不会显着影响car体的特性，除了可以提高选矿率或肉质。

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