Influence of Feeding Enzymatically Hydrolyzed Yeast Cell Wall on Growth Performance and Digestive Function of Feedlot Cattle during Periods of Elevated Ambient Temperature
| Autor: | Jaime Salinas-Chavira, Constantino Raymundo, J. D. Navarrete-Reyes, Richard A. Zinn, Olga M. Manríquez-Nuñez, Martín F. Montaño-Gómez, Víctor M. González-Vizcarra, C. Arzola |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Dairy & Animal Science
lcsh:Animal biochemistry Article Growth Performance Rumen Animal science Animal Production Clinical Research Latin square Dry matter lcsh:QP501-801 lcsh:SF1-1100 chemistry.chemical_classification Heat index Fatty acid food and beverages Yeast chemistry Biochemistry Feedlot Propionate Animal Science and Zoology Digestion Cattle lcsh:Animal culture Food Science |
| Zdroj: | Asian-Australasian Journal of Animal Sciences, Vol 28, Iss 9, Pp 1288-1295 (2015) Asian-Australasian journal of animal sciences, vol 28, iss 9 Asian-Australasian Journal of Animal Sciences., vol 28, iss 9 Asian-Australasian Journal of Animal Sciences |
| ISSN: | 1976-5517 1011-2367 |
| Popis: | In experiment 1, eighty crossbred steers (239±15 kg) were used in a 229-d experiment to evaluate the effects of increasing levels of enzymatically hydrolyzed yeast (EHY) cell wall in diets on growth performance feedlot cattle during periods of elevated ambient temperature. Treatments consisted of steam-flaked corn-based diets supplemented to provide 0, 1, 2, or 3 g EHY/hd/d. There were no effects on growth performance during the initial 139-d period. However, from d 139 to harvest, when 24-h temperature humidity index averaged 80, EHY increased dry matter intake (DMI) (linear effect, p0.10) on carcass characteristics. In experiment 2, four Holstein steers (292±5 kg) with cannulas in the rumen and proximal duodenum were used in a 4×4 Latin Square design experiment to evaluate treatments effects on characteristics of ruminal and total tract digestion in steers. There were no treatment effects (p>0.10) on ruminal pH, total volatile fatty acid, molar proportions of acetate, butyrate, or estimated methane production. Supplemental EHY decreased ruminal molar proportion of acetate (p = 0.08), increased molar proportion of propionate (p = 0.09), and decreased acetate:propionate molar ratio (p = 0.07) and estimated ruminal methane production (p = 0.09). It is concluded that supplemental EHY may enhance DMI and ADG of feedlot steers during periods of high ambient temperature. Supplemental EHY may also enhance ruminal fiber digestion and decrease ruminal acetate:propionate molar ratios in feedlot steers fed steam-flaked corn-based finishing diets. |
| Databáze: | OpenAIRE |
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