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首页> 外文期刊>Tropical Animal Health and Production >Effect of days in feedlot on growth performance, carcass and meat quality attributes of Tanzania shorthorn zebu steers
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Effect of days in feedlot on growth performance, carcass and meat quality attributes of Tanzania shorthorn zebu steers

机译：饲养场中天数对坦桑尼亚短角牛bu牛bu牛生长性能，car体和肉品质属性的影响

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摘要

A study was conducted on 50 steers (183 +/- 4 kg initial body weight, 3 years of age) to assess effects of days in feedlot on performance, carcass characteristics and meat quality of Tanzania shorthorn zebu (TSZ) cattle with the aim of determining appropriate finishing period. Periods were 0 day (P-0), 25 days (P-25), 50 days (P-50), 75 days (P-75) and 100 days (P-100) with 10 animals per period. Steers were housed in individual pens, fed with a concentrate diet and hay on an ad libitum basis except the P-0 group which was slaughtered at the beginning of trial. Long stay in feedlot, P-100, increased concentrate dry matter intake by 2 kg DM/day over short stay, P-25. Final weight and total gain increased (P 0.05) from P-25 (22.6 kg) to P-100 steers (95.4 kg). Periods had no influence (P > 0.05) on an average daily gain (ADG) and feed conversion ratio (FCR) but affected carcass characteristics. Empty body weight (EBW) and hot carcass weight (HCW) increased by 61 and 65 %, respectively, from no feedlot, P-0 to P-100. Dressing percentage was high (P 0.05) for P-100 steers. Carcass measurements, internal fat, fat thickness and carcass total fat were the highest (P 0.05) on P-100 steers and the lowest on P-0 steers. Rate of pH decline increased with days in feedlot, while cooking loss and shear force values decreased in advanced ageing time. Feedlot periods of 75 and 100 days resulted into high intake, carcass measurements and tenderness, but 100 days further increased carcass fatness and fat thickness levels, thus, with this particular feeding system and animal's condition, 75 days is the recommended period to finish TSZ cattle in feedlots.
机译：对50头牛（初始体重183 +/- 4千克，3岁）进行了一项研究，以评估饲养场天数对坦桑尼亚短角牛（TSZ）牛性能，car体特性和肉品质的影响，旨在：确定适当的完成时间。时期为0天（P-0），25天（P-25），50天（P-50），75天（P-75）和100天（P-100），每个时期有10只动物。将ers牛放在单独的围栏中，随意饲喂浓缩饲料和干草，但在试验开始时将P-0组宰杀。长期呆在饲喂场P-100中，与短暂停留P-25相比，精矿干物质摄入量每天增加2 kg DM。最终体重和总增重从P-25（22.6公斤）增加到P-100牛（95.4公斤），增幅（P <0.05）。期间对平均日增重（ADG）和饲料转化率（FCR）没有影响（P> 0.05），但影响car体特性。空腹体重（EBW）和热hot体体重（HCW）从无饲养场P-0到P-100分别增加了61％和65％。 P-100 ers牛的选矿百分比很高（P <0.05）。 -100体测量，内部脂肪，脂肪厚度和car体总脂肪在P-100 ers牛中最高（P <0.05），而在P-0 ers牛中最低。 pH值下降的速度随饲养场的天数增加而增加，而蒸煮损失和剪切力值在提前老化时间内下降。饲育期为75天和100天会导致高采食量，car体测量值和嫩度，但是100天会进一步增加car体脂肪和脂肪厚度水平，因此，在这种特殊的饲喂系统和动物状况下，建议75天是完成TSZ牛的时期在育肥场。

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