کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2454126 | 1110372 | 2012 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impact of clover additions to toxic or nontoxic endophyte-infected tall fescue on animal performance and economics of stocker programs1
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Seed; n = 6) either with N applied in autumn and spring (n = 3 pastures per cultivar) or grown in combination with white clover (CL, Trifolium repens L.; cv. Regal Graze, Producer's Choice, Woodland, CA; n = 3 pastures per cultivar). Growing steers (n = 252, BW = 228 ± 4.2 kg in the autumn and n = 343, BW 229 ± 4.8 kg in the spring) were stocked to pastures at 3.7 steers/ ha in the autumn, whereas initial stocking rates were adjusted to match forage mass each spring. Enterprise budgeting was used to compute net returns. Data in this 3 à 2 factorial arrangement were analyzed as a randomized complete block design using year as the random blocking factor. Performance of steers grazing NE was increased (P < 0.01) by 0.21 kg/d in the autumn and 0.57 kg/d in the spring compared with TE. Clovers did not affect (P = 0.46) ADG in the autumn but increased (P < 0.01) ADG in the spring by 0.2 kg/d; however, stocking rates and grazing days per hectare were decreased (P < 0.01) with CL regardless of season. Interseeding CL into KY31 pastures had no effect (P ⥠0.41) on BW gain per hectare. Body weight gain per hectare for NE was 79% greater (P < 0.01) than KY31, and NE tall fescue with N produced 17% more (P < 0.01) BW gain per hectare than CL. Neither N nor CL affected (P = 0.41) BW gain per hectare of KY31 pastures. Although CL pastures were not as productive, net returns were increased (P < 0.01) because of reduced costs of production. Using CL resulted in similar improvements in ADG for both TE and NE pastures. Profitability of NE-based stocker programs was at a minimum 3 times greater than TE-based stocker programs in any scenario.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 28, Issue 4, August 2012, Pages 433-442
Journal: The Professional Animal Scientist - Volume 28, Issue 4, August 2012, Pages 433-442
نویسندگان
P.A. PAS, M. Haque, J.T. Biermacher, A.A. Hopkins, D.S. Hubbell, T. Hess,