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首页> 外文期刊>The Professional Animal Scientist >Performance and Carcass Characteristics of Feedlot Steers: Effects of Delayed Implanting and Programmed Feeding During the Growing Period
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Performance and Carcass Characteristics of Feedlot Steers: Effects of Delayed Implanting and Programmed Feeding During the Growing Period

机译：性能和胴体饲养场的特征引导:植入和延迟的影响编程给日益增长的时期

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摘要

This experiment was conducted to determine the effect of programming the rate of gain and delaying the first implant in feedlot steers on feedlot performance and carcass characteristics. Ninety-six growing steers (269 +- 16.2 kg) were assigned to 12 pens in a completely randomized design. Treatments were implant (Synovex-S~(R); 20 mg estradiol benzoate and 200 mg progesterone; Fort Dodge Animal Health, Overland Park, KS) on d 1 or no implant and programmed feeding to gain at a slow (0.68 kg/d) or fast (1.14 kg/d) rate during the growing period; these treatments were randomly assigned (n = 8) to pens of steers in a 2 x 2 factorial arrangement. Steers were fed a growing diet and after 88 and 60 d (for steers fed to gain at a slow or fast rate, respectively), steers were transitioned to ad libitum consumption of a high concentrate finishing diet. Growing period implant treatments did not affect ADG but did affect (P<0.01) gain efficiency during the finishing period. Feeding steers for a slow rate of BW gain during the growing period improved (P=0.062) gain efficiency in the finishing period (169 vs 145 g gain/kg feed). Correlation coefficients between fat thickness and marbling score obtained via ultrasound and fat thickness and marbling score measured at harvest were greater the closer the ultrasound measurements were made to the final harvest date. These data indicate that feeding level prior to the start of the finishing period may affect BW gain efficiency during the finishing period.
机译：这一实验进行了确定编程获得的速度和效果推迟第一植入饲养场引导饲养场性能和胴体特性。九十六年增长引导(269 + - 16.2公斤)分配给12笔在一个完全随机设计。20毫克苯甲酸雌二醇和孕酮200毫克;道奇动物卫生堡Overland Park, KS) d1或无植入物和编程喂养来获得缓慢(0.68公斤/ d)或快速(1.14公斤/ d)率在生长期;随机分配(n = 8)笔的引导2 x 2的阶乘安排。日益增长的饮食和后88和60 d(引导美联储获得速度缓慢或快速分别),引导转换到广告随意的消费高集中完成的饮食。并不影响ADG但影响(P < 0.01)获得吗效率完成时期。引导BW期间获得速度比较慢生长期提高(P = 0.062)获得效率在最后时期(169 vs 145克/公斤提要)。厚度和大理石花纹的分数获得通过超声波和脂肪厚度和大理石花纹的分数测量在收获更大的越接近超声波测量了决赛收获日期。水平开始之前完成期间可能会影响BW增益效率完成时间。

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