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Integration of pasturing systems for cattle finishing programs

機譯：畜牧業(yè)計劃的牧場系統(tǒng)集成

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A three-year study, using 84 fall-born and 28 spring-born calves of similar genotypes each year, was conducted to integrate pasturing systems with drylot feeding systems. Fall and spring-born calves were started on test in May and October, respectively. Seven treatments were imposed: (1) fall-born calves directly into feedlot; (2 and 3) fall-born calves put on pasture with or without an ionophore and moved to the feedlot at the end of July; (4 and 5) fall-born calves put on pasture with or without an ionophore and moved to the feedlot at the end of October; (6 and 7) spring-born calves put on pasture with or without an ionophore and moved to the feedlot at the end of October. A 12.1 ha bromegrass pasture divided into 16 paddocks was available. Each treatment group had access to one paddock at a time and was rotated approximately at 3 day intervals. The time on pasture was determined by forage sward heights and dormancy of the forage. In the feedlot, steers were provided an 82% concentrate diet containing whole-shelled corn, ground alfalfa hay, a protein, vitamin and mineral supplement containing ionophore and molasses. When pens of cattle reached approximately 522 kg average live weight, they were processed and carcass traits were evaluated. Cattle on pasture receiving ionophore tended to gain faster (P > 0.11), but lost this advantage in drylot (P > .10). Overall, cattle started directly in the feedlot gained faster (P < .001). Cattle receiving an ionophore on pasture had lower KPH than those that did not receive an ionophore (P < .01) and tended to have more backfat (P = .09). Treatment influenced yield grade (P < 0.001), however all treatments were YG 2. All treatment groups graded 75% Choice or higher. Cattle started directly in the feedlot were the least profitable ($-46 vs $2; P < 0.001). Cattle receiving ionophore on pasture (JI, OI and SI versus JNI, ONI and SNI) were a little more profitable ($5.87 vs $4.25; P > 0.9). These results indicate that cattle fed on pasture for varying periods of time produced acceptable carcasses and that carcass price was an important variable affecting profitability. Thus, the timing of marketing is critical for optimizing profit.
機譯：進行了一項為期三年的研究，每年使用84個相似基因型的秋天出生的小牛和28個春天出生的小牛，將牧草系統(tǒng)與干地飼養(yǎng)系統(tǒng)整合在一起。秋季和春季出生的犢牛分別在5月和10月開始測試。采取了七種處理方法：（1）將出生在犢牛的小牛直接喂入飼養(yǎng)場； （2和3）在有或沒有離子載體的情況下將放下的小牛放牧，并于7月底移至飼養(yǎng)場。 （4和5）將有或沒有離子載體的秋胎牛放牧，并于10月底移至飼養(yǎng)場； （6和7）春季出生的小牛在有或沒有離子載體的情況下放牧，并于10月底移至飼養(yǎng)場。有一個面積為12.1公頃的草地草牧場，分為16個圍場。每個治療組一次只能接觸一個圍場，大約每3天輪換一次。牧草的時間??取決于牧草的草高和牧草的休眠狀態(tài)。在飼養(yǎng)場中，ste牛提供了82％的濃縮飼料，其中含有全殼玉米，苜蓿干草粉，蛋白質(zhì)，維生素和含有離子載體和糖蜜的礦物質(zhì)補充劑。當牛圈的平均活重達到約522公斤時，將對牛圈進行加工并評估其cas體性狀。接受離子載體的牧場上的牛往往增長更快（P> 0.11），但在干地牛上卻失去了這種優(yōu)勢（P> .10）?？傮w而言，直接從飼養(yǎng)場開始飼養(yǎng)的牛的生長速度更快（P <.001）。與未接受離子載體的牛相比，在牧場上具有離子載體的牛的KPH較低（P <.01），并且往往具有更多的后脂肪（P = .09）。處理影響產(chǎn)量等級（P <0.001），但是所有處理均為YG2。所有處理組的選擇等級為75％Choice或更高。直接在飼養(yǎng)場開始的牛獲利最少（-46美元對2美元； P <0.001）。在牧場上接受離子載體的牛（JI，OI和SI與JNI，ONI和SNI）利潤更高（5.87美元對4.25美元； P> 0.9）。這些結(jié)果表明，在不同的時間段內(nèi)以牧場為食的牛的produced體產(chǎn)量可以接受，price體價格是影響獲利能力的重要變量。因此，營銷時機對于優(yōu)化利潤至關(guān)重要。

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  • 作者

    Koknaroglu, Hayati.;

  • 作者單位

    Iowa State University.;

  • 授予單位 Iowa State University.;
  • 學科 Animal sciences.
  • 學位 Ph.D.
  • 年度 2001
  • 頁碼 118 p.
  • 總頁數(shù) 118
  • 原文格式 PDF
  • 正文語種 eng
  • 中圖分類
  • 關(guān)鍵詞

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