Three-breed rotational crossbreds of Montbéliarde, Viking Red, and Holstein compared with Holstein cows for feed efficiency, income over feed cost, and residual feed intake.
Autor: | Shonka-Martin BN; Department of Animal Science, University of Minnesota, St. Paul 55108. Electronic address: Brittany.Martin@genusplc.com., Heins BJ; Department of Animal Science, University of Minnesota, St. Paul 55108., Hansen LB; Department of Animal Science, University of Minnesota, St. Paul 55108. |
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Jazyk: | angličtina |
Zdroj: | Journal of dairy science [J Dairy Sci] 2019 Apr; Vol. 102 (4), pp. 3661-3673. Date of Electronic Publication: 2019 Feb 14. |
DOI: | 10.3168/jds.2018-15682 |
Abstrakt: | Rotational 3-breed crossbred cows of Montbéliarde, Viking Red, and Holstein (CB) were compared with Holstein (HO) cows for alternative measures of feed efficiency as well as income over feed cost (IOFC) and residual feed intake (RFI) during the first 150 d of first, second, and third lactations. Primiparous and multiparous CB (n = 63 and n = 43, respectively) and HO (n = 60 and n = 37, respectively) cows were fed the same total mixed ration twice daily with refusals weighed once daily. Feed was analyzed for dry matter content, net energy for lactation, and crude protein content. Body weight (BW) was recorded twice weekly. Daily production of milk, fat, and protein were estimated from monthly test days with best prediction. Measures of efficiency from 4 to 150 d in milk (DIM) were feed conversion efficiency (FCE), defined as fat plus protein production (kg) per kilogram of dry matter intake (DMI); ECM/DMI, defined as kilograms of energy-corrected milk (ECM) per kilogram of DMI; net energy for lactation efficiency (NE (Copyright © 2019 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.) |
Databáze: | MEDLINE |
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