Effect of supplementation of developing replacement heifers with monensin or bambermycins on gain and pregnancy rates 1 1This project was conducted with funding from the University of Arkansas Agricultural Experiment Station, Hatch Project No. AR 002434, gifts from ADM Alliance Nutrition Inc. (Quincy, IL), and a grant from Huvepharma Inc. (Peachtree City, GA)
| Autor: | T. Hess, Elizabeth B. Kegley, J. D. Tucker, C. Nichols, W. Galyen, Donald S. Hubbell, D.L. Galloway, Paul A Beck, J. Hill, M. Cravey, Rick Rorie |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Pregnancy Animal health media_common.quotation_subject Reproductive tract Monensin 0402 animal and dairy science 04 agricultural and veterinary sciences Biology Cynodon dactylon Bambermycins medicine.disease biology.organism_classification 040201 dairy & animal science Breed 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Animal science chemistry medicine Animal Science and Zoology Reproduction Food Science media_common |
| Zdroj: | The Professional Animal Scientist. 32:619-626 |
| ISSN: | 1080-7446 |
| Popis: | Medicated feed additives have been shown to increase BW gain and decrease age at puberty; therefore, heifers were provided nonmedicated control (CNTRL), bambermycins (BAMB, Gainpro, Huvepharma Inc., Sofia, Bulgaria), or monensin (MON, Rumensin, Elanco Animal Health, Greenfield, IN) supplements to determine effects on growth performance and reproductive development. Spring-calving (block 1; n = 70 heifers; BW = 208 ± 21.7 kg; age = 231 ± 17.0 d) and fall-calving (block 2; n = 72 heifers; BW = 225 ± 31.7 kg; age = 276 ± 12.8 d) heifers were allotted to treatments [n = 4 groups in CNTRL and 5 groups in BAMB and MON (block 1), 4 groups per treatment (block 2)] by breed, BW, and source. Heifers in block 1 grazed tall fescue [Lolium arundinaceum (Schreb.) Darbysh.] for 188 d; heifers in block 2 grazed bermudagrass (Cynodon dactylon) pasture and tall fescue for 161 d. The BW at breeding and ADG of CNTRL (323 ± 4.8 kg and 0.68 ± 0.0167 kg/d, respectively) was less (P ≤ 0.04) than medicated, yet MON (346 ± 4.6 kg and 0.73 ± 0.0163 kg/d) and BAMB (344 ± 4.6 kg and 0.74 ± 0.0163 kg/d) did not differ (P ≥ 0.69). Prebreeding reproductive tract scores (3.5 ± 0.60), cycling activity (61 ± 12.3%), and AI (30 ± 12.3%) and total pregnancy rates (82 ± 11.5%) did not differ (P ≥ 0.25) among treatments. This experiment indicates that BAMB and MON effectively increased growth performance of heifers but did not affect reproductive development or pregnancy rates. |
| Databáze: | OpenAIRE |
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