کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10161705 | 1110342 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of dose and duration of ractopamine hydrochloride supplementation on growth performance and carcass characteristics of feedlot heifers1
ترجمه فارسی عنوان
اثر دوز و مدت زمان مصرف مکمل کلرید رتوپامین بر عملکرد رشد و عملکرد لاشه تلیسه های خوراکی 1
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
چکیده انگلیسی
Our objectives were to determine the effects of dose and duration of ractopamine hydrochloride (RAC) supplementation on growth performance and carcass characteristics of feedlot heifers. Heifers (n = 128) were allotted to 20 pens. Pens were randomly assigned 1 of 4 treatments: (1) 0 mg of RAC/heifer per d for 28 d, (2) 300 mg of RAC/heifer per d (Optaflexx 45; Elanco Animal Health, Greenfield, IN) for 28 d, (3) 0 mg of RAC/heifer per d for 41 d, or (4) 300 mg of RAC/heifer per d for 41 d. Heifers were fed a basal diet of 50% corn, 20% dried distillers grains with solubles, 20% corn silage, and 10% supplement (DM basis). Dry rolled corn, 0.454 kg/heifer, was removed from the diet, and 300 mg of RAC/0.454 kg of ground corn carrier was top-dressed to heifers fed RAC, daily. There were no day à RAC interactions (P ⥠0.31) on growth performance or carcass characteristics, nor main effects (P ⥠0.11) of duration of RAC feeding on carcass characteristics. There were no effects (P ⥠0.22) of RAC on DMI, ADG, or G:F; however, heifers fed 300 mg of RAC had 8.4 kg heavier (P = 0.03) final BW than those not supplemented with RAC, corresponding to 9 kg greater (P < 0.01) HCW. Carcasses from heifers fed RAC had increased (P ⤠0.03) LM area and DP compared with those from heifers not fed RAC. Feeding RAC did not affect (P ⥠0.14) marbling, back fat, KPH, or YG. There were no interactions of RAC dose and duration; however, supplementing 300 mg of RAC/heifer per d increased final BW, HCW, LM area, and DP.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Professional Animal Scientist - Volume 32, Issue 3, June 2016, Pages 309-315
Journal: The Professional Animal Scientist - Volume 32, Issue 3, June 2016, Pages 309-315
نویسندگان
B.M. Edenburn, N.A. Pyatt, T.L. PAS,